Alternate costume (SSBU)

NOTE: Every claimed source needs a cross-reference link; claimed sources need to be plausible, not awfully obscure; default costumes usually don't need descriptions since they are not alternate costumes; returning costumes original to Smash do not need references to their appearances in previous Smash games.

Inkling male and female alternate costumes.

Mario wearing his Wedding and Builder alternate costumes.

Each character in Super Smash Bros. Ultimate has a set of alternate costumes. Due to the presence of 8-Player Smash, all characters have at least eight costumes. Some characters possess certain alternate costumes with more drastic design differences, and are not merely recolors of their standard outfits. Mario, Wario, Link, Zero Suit Samus, Ike, Little Mac, Shulk, Cloud, Bayonetta, and Ridley have different outfits available; Pichu, Pikachu, Pokémon Trainer, Villager, Wii Fit Trainer, Robin, Corrin, and Inkling all have male and female variants; and Olimar and Bowser Jr. have model swaps that change them into new characters, complete with corresponding voice and Announcer clips, though like all other alternate costumes, they bear no gameplay differences.

Bayonetta

Half of Bayonetta's costumes are based on her design from Bayonetta 2, while the other half are based on her design from Bayonetta. For the former half, she wields Love is Blue, which has blue attack trails. For the latter half, she wields Scarborough Fair, which has red attack trails. Her Bullet Climax has slightly different sound effects for the two different costume types.

Black	Based on her appearance in Bayonetta 2.
Original	Based on her appearance in Bayonetta.
Yellow
Green	Resembles her green alternate color in Anarchy Reigns.
Red	Based on Jeanne, Bayonetta's friendly rival. The hair visible in her Wicked Weaves and on Gomorrah is also colored white.
Pink
White
Blue	Resembles her blue alternate color in Anarchy Reigns.

Bowser

Default
Black	Combines elements of his black and brown costumes from Brawl.
Yellow
Green	Resembles one of his alternate colors in Mario Golf and his in-game sprite from Super Mario World.
Grey	Resembles Morton's original design from Super Mario Bros. 3 and Super Mario World.
Orange	Resembles Giga Bowser, his more powerful and menacing form introduced in Super Smash Bros. Melee. Giga Bowser used to resemble regular Bowser, but this has now been changed.
Red	Resembles one of his alternate colors in Mario Golf.
Blue	Based on Blue Bowser from Super Mario Bros.: The Lost Levels. It also resembles one of his alternate colors from Mario Golf.

Bowser Jr.

Instead of alternate color schemes, Bowser Jr.'s alternate costumes consist of the Koopalings. Bowser Jr.'s Junior Clown Car is the only one with black eyes and horizontal orange "eye paint", while the Koopalings' Clown Cars have yellow mechanical eyes with vertical black "eye paint". Aside from Roy and Morton, whose positions are swapped, the Koopalings are listed by the order they are fought in Super Mario Bros. 3.

Junior	Bowser Jr. rides in his Junior Clown Car that was introduced in New Super Mario Bros. Wii.
Larry	Replaced with Larry Koopa.
Roy	Replaced with Roy Koopa.
Wendy	Replaced with Wendy O. Koopa.
Iggy	Replaced with Iggy Koopa.
Morton	Replaced with Morton Koopa Jr.
Lemmy	Replaced with Lemmy Koopa.
Ludwig	Replaced with Ludwig von Koopa.

Captain Falcon

Indigo
Black	Based on his appearance in the Japanese commercial for F-Zero X.
Red	Based on Blood Falcon, Captain Falcon's clone and rival. It is his only costume with a unique logo on the back: a skull with "Blood Hawk" (the name of Blood Falcon's vehicle) written underneath.
Green	Reminiscent of Wild Goose's color scheme.
Blue	Resembles his appearance in the original F-Zero and in F-Zero: GP Legend.
White	Resembles Jody Summer's original appearance in F-Zero X.
Yellow	Possibly based on Dr. Stewart and the Golden Fox's color scheme.
Cyan

Chrom

Blue
Red	Resembles Walhart, an antagonist in Fire Emblem Awakening.
Green	Resembles Stahl, one of Chrom's Shepherds in Awakening.
Yellow	Resembles Owain, Chrom's nephew from Awakening.
Black
Purple	Resembles Yen'fay, a minor antagonist in Awakening.
White	Resembles Kellam, one of Chrom's Shepherds in Awakening.
Cyan

Cloud

Half of Cloud's costumes are based on his appearance in Final Fantasy VII, while the other half are based on his "Cloudy Wolf" design from Final Fantasy VII: Advent Children. He wields the Buster Sword in the former outfits and the Fusion Swords in the latter outfits.

Purple	Based on his appearance in Final Fantasy VII.
Advent	Based on his appearance in the movie Final Fantasy VII: Advent Children. It is referred to as his "Advent Children costume".
Blue	Resembles Zack Fair, Cloud's best friend, in his 2nd-Class SOLDIER uniform from Crisis Core: Final Fantasy VII.
Advent Blue	Resembles the 3rd-Class SOLDIER uniform from Crisis Core: Final Fantasy VII.
Red	Resembles the 2nd-Class SOLDIER uniform from Final Fantasy VII.
Advent Black	Based on his appearance in Advent Children after his fight with Bahamut SIN, during which his sleeve is torn off.
Brown
Advent Purple

Corrin

Half of Corrin's costumes are male, while the other half are female.

Default	Based on the default customization settings for the Nohr Prince in Fire Emblem Fates.
Female	Based on the default customization settings for the Nohr Princess in Fates.
Red
Orange
Blue
Pink
Green
Black	Resembles her appearance as a Nohr Noble in Fates.

Daisy

Orange
Green	Resembles Peach's appearance on the title screen of NES Open Tournament Golf.
Pink	Resembles Peach's appearance in Super Mario Bros. 2 and Super Mario Bros. 3, where she was a curly-haired brunette.
Blue	Resembles her appearance on the title screen of NES Open Tournament Golf.
Red	The color scheme of this costume looks very similar to that of a traditional Japanese red dress.
Purple	Resembles her appearance in the Short Game mode from Mario Tennis.
White	Resembles a wedding gown. It is complimentary to Princess Peach's wedding costume.
Black	Resembles a maid uniform.

Dark Pit

Black
Green
Brown	Resembles Magnus from Kid Icarus: Uprising.
Yellow
Red
Blue
White	Resembles Pit. Dark Pit retains his black wings and gains a red scarf, likely to better differentiate the two. It is complementary to Pit's "fallen angel" costume.
Purple

Dark Samus

Blue	Resembles her appearance in Metroid Prime 3: Corruption.
Green
Purple	Resembles Gandrayda from Metroid Prime 3: Corruption.
Red	Resembles Spire from Metroid Prime Hunters.
Yellow	Resembles the Golden Torizo from Super Metroid.
Grey	Resembles concept art of her from Metroid Prime 2: Echoes.
Black	Resembles Orange Phazon from Metroid Prime.
Pink

Diddy Kong

Red
White	The vest is reminiscent of Diddy Kong's alternate outfit in Donkey Kong Country's Two-Player Contest mode.
Pink	Resembles Dixie Kong, Diddy Kong's girlfriend.
Purple	Resembles his appearance in Donkey Kong Country 2: Diddy's Kong Quest's Two-Player Contest mode.
Green	Resembles one of his alternate costumes from Donkey Kong 64's Multiplayer Mode.
Blue	Resembles Kiddy Kong, Dixie's partner in Donkey Kong Country 3: Dixie Kong's Double Trouble.
Yellow	Resembles a chimpanzee.
Cyan	Resembles Donkey Kong Jr. as he appears in Donkey Kong Jr. Math.

Donkey Kong

Brown
Black	Resembles a gorilla. The tie is reminiscent of Donkey Kong's appearance in Donkey Kong Country's Two-Player Contest Mode.
Red	Resembles the original D.K. from Donkey Kong.
Blue	Resembles one of his alternate costumes from Donkey Kong 64's Multiplayer Mode. It also resembles one of his alternate colors from Mario Golf.
Green	Resembles one of his alternate colors in DK: King of Swing's Jungle Jam mode.
White	Referred to as "Yeti DK" on the Brawl DOJO!! Resembles the mythical yeti. It also resembles the Fire Mini Donkey Kongs from the Mario vs. Donkey Kong series and Eddie the Mean Old Yeti from the Donkey Kong Country TV series.
Yellow	Resembles one of his alternate colors from Mario Golf.
Pink	Resembles Junior (II) from Donkey Kong Jr. Math.

Dr. Mario

White	Resembles his appearance in Dr. Mario 64, but with black jeans instead of white trousers.
Red	Resembles the color of scrubs worn by modern nurses.
Blue	Resembles the color of scrubs worn by modern doctors.
Green	Resembles the color of scrubs worn by modern surgeons.
Black	Referred to as the "Unlicensed Doctor" on the Melee website.
Yellow
Purple
Pink	Resembles the color of the scrubs worn by Nurse Toadstool.

Duck Hunt

Default	The duck is one of the three possible ducks from Duck Hunt.
Black	The dog has a tricolor coat pattern. The duck resembles a male Saxony duck.
Blue	The dog has the bicolor coat pattern of a Border Collie. The duck resembles an American black duck.
Brown	The duck resembles a female Orpington duck.
White	The dog resembles a Dalmatian. The duck resembles a ruddy shelduck, an orange species with green wings.
Tan	The dog resembles a Beagle. The duck resembles a male blue-headed mallard, an uncommon variant.
Yellow	The duck is one of the three possible ducks that appear in Duck Hunt. It resembles a male mallard.
Red	The dog resembles a black Labrador Retriever. The duck is one of the three possible ducks from Duck Hunt.

Falco

Default	Based on his appearance in Star Fox Zero.
Orange	Resembles his appearance in Star Fox 64 and Star Fox 64 3D.
Blue
Red	Resembles his appearance in Star Fox: Assault.
Green
Black	Complementary to Fox's "Dark Fox" costume. Resembles a black pheasant or raven.
White
Pink

Fox

Default	Based on his appearance in Star Fox Zero.
Black	Referred to as the "Dark Fox" on the Brawl DOJO!! It resembles a black fox.
Red	Resembles his red "Player 1" costume from Star Fox: Assault's Versus Mode and Falco's appearance in Assault.
Green	Resembles his green "Player 4" costume from Assault's Versus Mode.
Orange	Resembles Falco's appearance in Star Fox 64 and Star Fox 64 3D.
White
Yellow	Resembles his yellow "Player 3" costume from Assault's Versus Mode.
Purple	Resembles Wolf.

Ganondorf

Default	Based on his appearance in The Legend of Zelda: Ocarina of Time.
Violet
Blue	Resembles his original appearance as the monster Ganon in The Legend of Zelda, A Link to the Past, the Oracle titles, Four Swords Adventures, and A Link Between Worlds.
Green
Purple
Brown	Resembles his appearance in The Legend of Zelda: The Wind Waker.
White	Complementary to Link's "Dark Link" costume.
Grey	Resembles his appearance in The Legend of Zelda: Twilight Princess.

Greninja

Blue
Red
Pink	Resembles the Pokémon Lickilicky.
Black	While created in SSB4, the alt retroactively resembles shiny Ash-Greninja.
Violet
Green
Grey
Purple

Ice Climbers

The Ice Climbers switch positions and the player controls Nana when using the red, brown, white and orange costumes. The stock icons and character select portraits change to reflect this.

Purple
Blue	Nana's parka resembles Popo's immediately after touching an enemy but before turning completely white.
Green
Indigo
Red	Nana resembles her appearance on the American boxart for Ice Climber.
Brown
White	The colors of their mittens match those of their default colors. The parka color resembles their sprite after touching an enemy.
Orange

Ike

Ike uses his Ranger design from Fire Emblem: Path of Radiance for half of his costumes, and his Hero design from Fire Emblem: Radiant Dawn for the other half. Each design was previously used for his appearance in Brawl and Smash 4, respectively.

Default	Based on his appearance as a Ranger in Fire Emblem: Path of Radiance.
Brown	Based on his appearance as a Hero in Fire Emblem: Radiant Dawn.
Purple
Red
Yellow	Resembles Greil, Ike's father. The costume and green headband is also reminiscent of Ike's appearance in the Lord class.
Green	Resembles Geoffrey, one of Ike's comrades, as he appears in Path of Radiance.
Blue	Resembles Sigurd, one of the protagonists in Fire Emblem: Genealogy of the Holy War.
Black	Resembles the Black Knight, Ike's rival, as he appears in Radiant Dawn.

Incineroar

Red
Green
Black	Partial reversal of its normal colors. It resembles his pre-evolution, Litten, but with a grey torso instead of a black one.
Blue
Orange	Resembles the Pokémon Infernape.
Purple	Resembles Big the Cat from the Sonic the Hedgehog series.
Grey	Resembles the Pokémon Salandit.
White	Resembles its shiny coloration.

Inkling

Inkling alternates between a female and male versions from the original Splatoon. Aside from the first and fifth costume, the costume colors match the respective port color.

Orange	Female Inkling wearing Fake Contacts, a White Tee, and Pink Trainers, as she appears in artwork for Splatoon.
Blue	Male Inkling wearing Fake Contacts, a Zink Layered LS, and Purple Hi-Horses, as he appears in artwork for Splatoon.
Yellow	Female Inkling wearing the Hero Headset Replica, Hero Jacket Replica, and Hero Runner Replicas, as she appears in artwork for Splatoon, but with yellow tentacles and ink instead of green. She resembles Agent 3.
Green	Male Inkling wearing the Skull Bandana, Armor Jacket Replica, and Moto Boots, as he appears on the boxart for Sheldon's Picks.
Pink	Female Inkling wearing the Takoroka Mesh, Black Squideye, and White Kicks, as she appears in artwork for Splatoon.
Cyan	Male Inkling wearing the Retro Specs, Baby-Jelly Shirt, and Blue Slip-Ons, as he appears in artwork for Splatoon, but with cyan tentacles and ink instead of purple.
Purple	Female Inkling wearing the Squid Hairclip, School Uniform, and School Shoes, as she appears in promotional artwork from the Squid Research Lab.
Indigo	Male Inkling wearing the Skate Helmet, Octo Tee, and Octoling Boots.

Isabelle

Half of Isabelle's costumes are based on her Summer Outfit, and the other half are based on her Winter Outfit.

Green	Wears her summer outfit from Animal Crossing: New Leaf.
Yellow	Wears her winter outfit from New Leaf.
Pink	Resembles her casual outfit from Animal Crossing: Happy Home Designer.
Red	Resembles Digby, Isabelle's brother.
Purple	Resembles her Winter Solstice outfit in New Leaf.
Teal	Resembles Tom Nook as he appears in New Leaf.
Grey	Resembles her Labor Day outfit in New Leaf.
Blue	Resembles Zipper T. Bunny, a special event villager appearing on Bunny Day.

Jigglypuff

Default
Red
White	Its hat is reminiscent of Leaf, the female protagonist of Pokémon FireRed and LeafGreen.
Blue	Resembles one of the possible colors for a nicknamed Jigglypuff in Pokémon Stadium. Its hat is reminiscent of the Bug Catcher Trainer class.
Green	Resembles one of the possible colors for a nicknamed Jigglypuff in Pokémon Stadium. Its cap is reminiscent of Kirby with the Sleep Copy Ability.
Pink	Resembles its Red Team costume from the original Super Smash Bros.
Nurse	Its hat is reminiscent of the Pokémon Center Nurse from Pokémon X and Y.
Glasses	Its cap and glasses respectively are reminiscent of Serena's Red Felt Hat and White Wide-Frame Glasses from X and Y.

Ken

Most of Ken's costumes seem to largely derive from his alternate costumes from Super Street Fighter II Turbo. The attributed references below come from that game unless otherwise specified.

Red
Grey	Resembles his "Medium Punch" color ("Strong" in reference source).
Blue	Resembles his "Heavy Punch" color ("Fierce" in reference source).
White	Resembles his "Light Punch" color ("Jab" in reference source).
Green	Resembles his "Light Kick" color ("Short" in reference source).
Yellow	Resembles his "Start button" color.
Cyan	Resembles his "Medium Kick" color ("Forward" in reference source).
Black	Resembles Violent Ken's "Kick" color in SNK vs. Capcom: SVC Chaos.

King Dedede

Red
Pink	Resembles one of his alternate colors in Kirby 64: The Crystal Shards' Multiplayer mode.
Green	Resembles one of his alternate costumes in Kirby Air Ride. The obi features sprites of Waddle Dees on it.
Purple	Resembles one of his alternate costume in Kirby Air Ride. The obi is reminiscent of formal Japanese kimonos.
Cyan	The obi features the same icons as one of the menu schemes from Kirby 64.
Grey	Resembles his appearance on the monochromatic Game Boy screen in Kirby's Dream Land.
Blue	Resembles one of his alternate colors in Kirby 64's Multiplayer mode.
Black	Resembles one of his alternate costume in Kirby Air Ride and a great penguin.

King K. Rool

Green
Orange	Resembles Re-Koil from Donkey Kong Country 3: Dixie Kong's Double Trouble and Kerozene from the Game Boy Advance version of Donkey Kong Country 2: Diddy's Kong Quest.
Blue	Resembles Krusha from Donkey Kong Country and Donkey Kong 64.
Yellow	Resembles Kutlass from Donkey Kong Country 2 and Kopter as he appears in Donkey Kong Barrel Blast.
Pink	Resembles Skidda in Donkey Kong Country 3; Klump as he appears in Donkey Kong 64; and Kritters from the Game Boy Advance version of Donkey Kong Country.
Black	Resembles Black Kritters from Donkey Kong Country.
Brown	Resembles one of his alternate colors in DK: King of Swing's Jungle Jam mode.
White	Based on Mr. X, an unused enemy from Donkey Kong Country 2 that was redesigned into Kackle.

Kirby

Pink
Yellow	Based on and directly referred to as "Keeby" from Kirby's Dream Course. It also resembles Yellow Kirby from various Kirby titles and Beam Kirby in Kirby Super Star.
Blue	Based on Ice Kirby in Kirby Super Star. It also resembles Blue Kirby from various Kirby titles.
Red	Based on Fire Kirby in Kirby Super Star. It also resembles Red Kirby from various Kirby titles.
Green	Resembles Green Kirby from various Kirby titles and Plasma Kirby in Kirby Super Star Ultra.
White	Resembles his monochromatic in-game sprite from Kirby's Dream Land.
Orange	Resembles Suplex Kirby, as well as Kirby's appearance after using Orange Spray Paint in Kirby & The Amazing Mirror and Kirby: Squeak Squad.
Purple	Resembles Meta Knight unmasked.

Link

Link's clothing design is based on his Champion's Tunic for half of his costumes, and based on the Hero of the Wild set for the other half. Both are from The Legend of Zelda: Breath of the Wild.

Blue	Based on his appearance wearing the Champion's Tunic in Breath of the Wild.
Green	Wears the Hero of the Wild set from Breath of the Wild. Notably the only "Tunic" alternate costume that exposes Link's knees.
Red	Resembles the Hylian Tunic from Breath of the Wild.
Grey	Resembles Fierce Deity Link from The Legend of Zelda: Majora's Mask.
Indigo	Resembles the Royal Guard Uniform from Breath of the Wild. The colors of the Hylian Shield resembles the Royal Guard's Shield.
Teal	Resembles his appearance from The Legend of Zelda: Twilight Princess.
White	Resembles his appearance as a resident of Skyloft from the beginning of The Legend of Zelda: Skyward Sword, though less so than the equivalent costume from Smash 4.
Black	Based on Dark Link. Resembles the Dark Armor set from Breath of the Wild.

Little Mac

Little Mac is the only character to have their number of costumes decrease from SSB4, going from 16 in SSB4 to 8 in Ultimate.

Default	Based on his appearance in Punch-Out!! (Wii).
Yellow	Resembles his appearance in Punch-Out!! (Wii)'s Title Defense Mode.
White	Resembles his in-game sprite after defeating opposing boxers in Punch-Out!! (1987) and Piston Hondo's appearance in Punch-Out!! (Wii).
Blue	Resembles his appearance when fighting in the World Circuit in Punch-Out!! (Wii).
Black	Resembles the protagonist of Super Punch-Out!!
Pink	Wears his pink, hooded sweatshirt from the training montages in the Punch-Out!! series.
Wire	The wireframe design based on the original arcade Punch-Out!! His colors appear cel-shaded in this costume.
Green	Based on his pink, hooded sweatshirt from the training montages in the Punch-Out!! series, but with the colors inverted. His colors appear cel-shaded in this costume.

Lucario

Blue
Purple
White	Resembles Riolu, Lucario's pre-evolved form.
Grey
Teal
Navy
Green
Pink

Lucas

Yellow
Orange	Resembles Claus, Lucas's twin brother from Mother 3.
Blue
Red
Grey	Resembles the Masked Man from Mother 3. The shirt's design includes a sprite of the Masked Man's head.
Cyan	Resembles Duster from Mother 3.
Green	Resembles Boney's human disguise from Mother 3. The shirt's design features a sprite of Boney's head.
Purple	The shirt's design includes a sprite of a baby Drago from Mother 3.

Lucina

Lucina's alternate costumes are based on female characters from Fire Emblem Awakening.

Blue
Green	Resembles Nowi.
Black	Resembles Cherche.
White	Resembles Cordelia.
Red	Resembles Tiki. The back of her cape features a crest of the Divine Dragon Naga, Tiki's mother.
Yellow	Resembles Lissa, Lucina's aunt.
Navy	Resembles Tharja. The back of her cape features the Brand of the Fell Dragon, a prominent symbol in Tharja's home country.
Purple	Resembles Sumia.

Luigi

Green
Orange	Resembles Mario's appearance on the boxart for Pinball, although Luigi's cap is orange instead of blue.
Pink	The original Super Smash Bros. website referred to this costume as "Strawberry Luigi". It resembles his appearance in Wrecking Crew.
Cyan	Resembles Mario's appearance on the American boxart for Mario Bros.
White	Resembles Fire Luigi.
Purple	Resembles Waluigi, though the "L" on his cap is purple instead of yellow.
Blue	Resembles his appearance in early Japanese merchandise, such as in his appearance in the 1986 anime Super Mario Bros.: Peach-hime Kyushutsu Dai Sakusen! and the cover of the 1986 album Mario no Daibouken.
Yellow	The artwork for this alternate costume shows the "L" on his cap as yellow instead of its actual light blue color in-game. Resembles his appearance in the Atari XE port of Mario Bros., although Luigi's cap is yellow rather than green.

Mario

Red
Striped	Based on his appearances from Family Computer Golf: U.S. Course and NES Open Tournament Golf.
Blue	Reminiscent of the colors of his outfit on the Japanese cover of the Famicom Mini (Game Boy Advance) port of Mario Bros. and the European cover of the NES version of Mario Bros.. These covers feature a faded version of the original Japanese cover of Mario Bros. for Famicom.
Black	Originally based on Foreman Spike from Wrecking Crew, though the palette has become more monochromatic since its debut in the original Super Smash Bros.
Green	Reminiscent of the colors of his outfit on the Japanese boxart for Wrecking Crew, but with the overalls being more brown. It also resembles Luigi's appearance from promotional artwork for the arcade version of Mario Bros., with the colors of the overalls and shirt swapped.
Purple	Resembles Waluigi. It also resembles Mario's appearance with the L and W Emblems equipped in Paper Mario: The Thousand-Year Door.
Yellow	Builder Mario from Super Mario Maker.
White	Wedding Mario from Super Mario Odyssey.

Marth

Navy	Based on his appearance as a Lord in Fire Emblem: Shadow Dragon and New Mystery of the Emblem: Heroes of Light and Shadow. Falchion retains its design from Mystery of the Emblem.
Red	Resembles the overworld sprites of enemy units in the Fire Emblem games.
Green	Resembles the overworld sprites of allied units in the Fire Emblem games.
Black	Resembles Camus, one of Marth's allies, as he appears starting with Fire Emblem: Mystery of the Emblem.
White	Resembles Leif, the protagonist of Fire Emblem: Thracia 776.
Blue	Resembles his appearance in Mystery of the Emblem.
Yellow	Resembles Roy's yellow costume in Melee, but with black pants instead of white.
Purple	Resembles artwork of him from Shadow Dragon and the Blade of Light.

Mega Man

Blue
Red	Resembles his appearance when using Items 1, 2, and 3 in Mega Man 2.
Green	Resembles his appearance when using the Leaf Shield in Mega Man 2 and the Gyro Attack in Mega Man 5.
Brown	Resembles his appearance when using the Metal Blade in Mega Man 2 and the Ring Boomerang in Mega Man 4.
Cyan	Resembles his appearance when using the Air Shooter in Mega Man 2 and the Jewel Satellite in Mega Man 9.
Chartreuse	Resembles his appearance when using the Slash Claw in Mega Man 7.
Orange	Resembles his appearance when using the Flame Blast in Mega Man 6.
Grey	Resembles his appearance when using the Thunder Beam in the original Mega Man, the Top Spin in Mega Man 3, and the Thunder Wool in Mega Man 10.

Meta Knight

Blue
White	Resembles one of his alternate costumes in Kirby Air Ride.
Red	Resembles one of his alternate costumes in Kirby Air Ride.
Green	Resembles one of his alternate costumes in Kirby Air Ride.
Navy	Resembles his original appearance in Kirby's Adventure, but with red eyes.
Pink	Resembles one of his alternate costumes in Kirby Air Ride, as well as Kirby.
Purple	Based on Galacta Knight. Extra details include a pink Galaxia, and the mask's vertical slit and yellow markings.
Grey	Based on Dark Meta Knight. Extra details include a silver Galaxia with a blue gem, and a scar on the left side of his mask.

Mewtwo

Default
Orange	Resembles one of the possible colors for Mewtwo in the Pokémon Stadium titles.
Blue	Resembles one of the possible colors for Mewtwo in the Pokémon Stadium titles.
Brown
Pink	Resembles its original artwork from Pokémon Red and Green, which was presented as pink rather than purple later on.
Yellow	Resembles its original Shiny coloration from Pokémon Gold, Silver, and Crystal.
Cyan
Purple	Resembles Shadow Lugia from Pokémon XD: Gale of Darkness.

Mii Fighter

The Mii Fighters' various costume options are distinct from how other characters' alternate costumes work. Unlike in SSB4, the colors of Mii Fighters' outfits are now customizable.

Mr. Game & Watch

Black	Resembles the characters from the Game & Watch games Fire and Parachute. He has the general color of the LCD frames in most of the Game & Watch handhelds.
Red	Reminiscent of characters and objects as depicted on the Virtual Boy.
Yellow	Reminiscent of characters and objects as depicted on the original Game Boy.
Blue
Teal	Reminiscent of the two shades commonly used by the Game Boy for the background and foreground.
Cyan	Reminiscent of the backlit display of the Game Boy Light.
Green
White	Reminiscent of the monochromatic LCD screen of the Game & Watch games.

Ness

Red
White	Resembles Fuel from Mother 3, but with a cap.
Yellow	Based on the uniforms of the Hanshin Tigers, a Japanese baseball team. The shirt's pattern is reminiscent of the Gigantic Ant enemy from EarthBound.
Green	His clothes resemble the color scheme of Everdred’s outfit in EarthBound.
Blue	Resembles his younger self that he encounters in Magicant.
Black	The shirt features a sprite of Mr. Saturn on the front.
Cyan	The shirt's pattern is reminiscent of Master Belch from EarthBound.
Purple	The shirt's pattern is reminiscent of the tile pattern on the file select and character naming screens in EarthBound.

Olimar

Four of Olimar's costumes replace him with Alph, one of the protagonists of Pikmin 3.

Tan	Based on his appearance in Pikmin 3.
Red
Green
Blue	Combines elements of his white and blue costumes from Brawl, which resemebled a Navy Mark IV space suit and his partner Louie from Pikmin 2, respectively.
Alph	Replaced with Alph.
Alph Green	Resembles Charlie, Alph's captain in Pikmin 3.
Alph Pink	Resembles Brittany, Alph's co-worker in Pikmin 3.
Alph Red	Resembles Olimar.

Pac-Man

Pac-Man's stock icons are the only ones that do not alter its colors directly to represent each palette swap; instead, a colored neon bar is used under the stock icon. This bar appears similar to the wall sections from the original Pac-Man.

Default	Based on his design in the Japanese version of Pac-Land, the Pac-Man World titles, and the Japanese arcade cabinets.
Blue	Resembles his in-game sprite with the Wing Shoes power-up from Pac-Land.
Yellow
Black
Purple
White	Resembles his appearance with the Wing Shoes power-up from Pac-Land.
Red
Plaid	His gloves and boots are reminiscent of oven mitts.

Palutena

White
Pink	Resembles her in-game sprite from the original Kid Icarus.
Cyan	Resembles Amazon Pandora from Kid Icarus: Uprising.
Green	Resembles her appearance in Kid Icarus' instruction booklet.
Blue
Red	Resembles Viridi.
Black	Resembles Dark Pit.
Purple	Resembles Medusa as she appears in Uprising.

Peach

Pink
Yellow
Red	Resembles Pauline's original appearance in Donkey Kong.
Blue	Resembles one of her alternate colors from Mario Golf and Daisy's appearance on the title screen of NES Open Tournament Golf.
Green	Resembles one of her alternate colors from Mario Golf and her appearance on the title screen of NES Open Tournament Golf.
White	Resembles a wedding gown. The dress is reminiscent of the wedding dress Paper Peach wore in Super Paper Mario.
Fire	Resembles her in-game sprite from the original Super Mario Bros. and Fire Peach from Super Mario 3D World.
Black

Pichu

Yellow
Cyan	Its goggles are reminiscent of the Swimmer Trainer class.
Red	Resembles its Red Team costume from Super Smash Bros. Melee, but without the neckerchief.
Grey	Its beanie has the same design as those of Team Skull Grunts from Pokémon Sun and Moon.
Blue	Its bandanna has the same design as those of Team Aqua Grunts from Pokémon Ruby and Sapphire.
Spiky	Spiky-eared Pichu, a special Pichu that appeared in Pokémon HeartGold and SoulSilver.
White
Band	Its headband resembles the Focus Band.

Pikachu

Default
Red	Resembles one of the possible colors for a nicknamed Pikachu in Pokémon Stadium and its Shiny coloration. Its cap is reminiscent of Red's appearance in Pokémon Red and Blue.
Green	Resembles one of the possible colors for a nicknamed Pikachu in Pokémon Stadium. Its headband is reminiscent of Brendan's appearance in Pokémon Emerald.
Yellow	Its cap is reminiscent of Ethan's appearance in Pokémon HeartGold and SoulSilver.
Blue	Resembles its Blue Team costume from the original Super Smash Bros.
Glasses	Resembles its appearance in Pokémon X and Y and its official artwork for the Pokémon series. Its cap and glasses respectively are reminiscent of Calem's Red Outdoors Cap and Wide-Frame Glasses from X and Y.
Female	Female Pikachu. Its hat is reminiscent of Selene's Casual Cap from Pokémon Sun and Moon.
Libre	Female Pikachu. It wears the Libre costume from Pokémon Omega Ruby and Alpha Sapphire.

Piranha Plant

For each costume, the container Piranha Plant sits in alternates between a pot and a pipe.

Red	It sits in the brown pot from Super Mario 3D World.
Green	Resembles its original design from Super Mario Bros.
Yellow	Resembles the Wild Ptooie Piranha from Super Mario World 2: Yoshi's Island after being struck once; a yellow Piranha Plant from the "Piranha Panic" minigame in Mario Superstar Baseball; and the Glad Piranha Plant from Super Princess Peach.
Pink	Resembles the Piranha Creeper from Super Mario 3D World.
Black	Resembles the Inky Piranha Plant from Super Mario 3D Land.
White	Resembles the Bone Piranha Plant from New Super Mario Bros. 2.
Purple	Resembles a purple Piranha Plant from the "Piranha Panic" minigame in Mario Superstar Baseball; the Big Bungee Piranha from Yoshi's Island DS; and the Prickly Piranha Plant from Super Mario Galaxy.
Blue	Resembles its blue cave sprite from Super Mario Bros. Its stalk and leaves are the same color as the green costume, furthering the connection.

Pit

Default	Based on his appearance in Kid Icarus: Uprising.
Yellow
Red	Resembles his chiton after obtaining the Gold Arrow and reaching Level 4 strength in the original Kid Icarus.
Green	Resembles his chiton after obtaining the Bronze Arrow and reaching Level 2 strength in Kid Icarus. The wings are now red.
Blue	Resembles his chiton after obtaining the Sacred Arrow and reaching Level 5 strength in Kid Icarus.
Black	Referred to as a "fallen angel" on the Brawl DOJO!! Unlike in Brawl, Pit retains his brown hair and his laurel wreath becomes purple, likely to better differentiate him from Dark Pit.
White	Resembles a putto.
Pink	Combines elements of his cyan and pink costumes from Smash 4.

Pokémon Trainer

Only the starting Pokémon is shown on the character selection screen; it can be changed by hovering the cursor over it and selecting it. All of Pokémon Trainer's alternate costumes reference a protagonist from each generation of the Pokémon games.

Default	Male Pokémon Trainer is based on his appearance in Pokémon FireRed and LeafGreen.
Red	Female Pokémon Trainer is based on her appearance in Pokémon FireRed and LeafGreen. Squirtle resembles the Pokémon Wartortle, its evolved form. Ivysaur resembles its in-battle sprite from Gold, Silver, and Crystal. Charizard resembles the Pokémon Charmeleon, its pre-evolved form.
Green	Male Pokémon Trainer resembles Ethan as he appears in Pokémon Gold, Silver and Crystal. Squirtle resembles its Shiny coloration. Ivysaur resembles its monochrome sprite from the Gen I games.
Pink	Female Pokémon Trainer resembles May as she appears in Pokémon Emerald.
Yellow	Male Pokémon Trainer resembles Lucas as he appears in Pokémon Diamond and Pearl. Squirtle resembles its in-battle sprite from Gold, Silver, and Crystal. Ivysaur resembles its Shiny coloration. Charizard resembles the Shiny colorations of Charmander and Charmeleon.
White	Female Pokémon Trainer resembles Hilda, the female protagonist of Pokémon Black and White. Charizard resembles the Pokémon Aerodactyl.
Blue	Male Pokémon Trainer resembles Calem, the male protagonist of Pokémon X and Y. He has tanned skin, much like one of the customizable options in X and Y. Charizard resembles the Pokémon Zubat and its evolved form, Golbat.
Purple	Female Pokémon Trainer resembles Selene as she appears in Pokémon Ultra Sun and Ultra Moon. She has tanned skin, much like one of the customizable options in Sun, Moon, Ultra Sun and Ultra Moon. Charizard resembles its original Shiny coloration from Pokémon Gold, Silver, and Crystal.

Richter

Default
Red	Resembles Christopher Belmont as he appears in Castlevania: The Adventure ReBirth.
Purple	Resembles Richter's appearance from the unreleased 32X Castlevania game.
Green	Resembles the "Curse" status-effect from Castlevania: Rondo of Blood and Castlevania: Dracula X.
Yellow	Resembles artwork for John Morris for Castlevania: Bloodlines.
Blue	Resembles his design in Castlevania: Symphony of the Night.
Black	Resembles the end credits graphics of Castlevania: Dracula X, which are displayed in a monochromatic palette.
White	Resembles Leon Belmont from Castlevania: Lament of Innocence.

Ridley

Default	Ridley seems to be an amalgamation of his in-game sprite from Super Metroid and his appearance in Metroid: Other M.
Meta	Meta Ridley, resembling his original design from Metroid Prime and Brawl's Subspace Emissary.
Red	Resembles artwork of him for Super Metroid and his appearance on the American boxart.
Blue	Resembles Neo-Ridley from Metroid Fusion.
Green	Resembles artwork of him for Metroid: Zero Mission.
Purple	Resembles his in-game sprite from Metroid.
Yellow	Resembles the Golden Statue of Ridley from Super Metroid.
Grey	Resembles Mecha Ridley from Zero Mission.

R.O.B.

Tan	Based on the Japanese version of R.O.B. released for the Famicom. The text on his base reads "Family Computer Robot". It is the default color for Japanese releases of Ultimate.
Grey	Based on the western version of R.O.B. released for the NES. The text on his base reads "R.O.B. - Robotic Operating Buddy". It is the default color for North American and PAL releases of Ultimate.
Yellow	Resembles Spike, a glitch enemy from Stack-Up.
Purple	Resembles Flipper, a glitch enemy from Stack-Up.
Blue	Resembles the Indigo Nintendo GameCube.
Green	Resembles the R.O.B. Launcher enemy from Brawl's Subspace Emissary.
Cyan	Resembles the Pearl Blue Game Boy Advance SP. Also resembles an inverse of its blue costume.
Red	Resembles the Virtual Boy.

Robin

Half of Robin's costumes are male, while the other half are female.

Default	Based on the default customization settings for the male tactician in Fire Emblem Awakening.
Female	Based on the default customization settings for the female tactician in Awakening.
Green	Resembles the overworld sprite for Mark, the customizable tactician from Fire Emblem: The Blazing Blade. Robin's hair color more closely resembles Mark's than the equivalent costume in Smash 4.
Red	Resembles Anna, a reoccurring shopkeeper in the Fire Emblem series, as she appeared in Awakening. Robin's hair color less closely resembles Anna's than the equivalent costume in Smash 4.
Blue	Resembles Kris, the avatar from Fire Emblem: New Mystery of the Emblem: Heroes of Light and Shadow.
Yellow	Resembles Eyvel from Fire Emblem: Thracia 776. Robin's hair color less closely resembles Eyvel's than the equivalent costume in Smash 4.
White	Resembles the White Mage class from Square Enix's Final Fantasy series. Robin's hair color has been changed to dark brown, as opposed to the pitch black from Smash 4.
Pink	Resembles Serra from The Blazing Blade.

Rosalina & Luma

With the exception of the purple costume, Rosalina's alts are complementary to Peach's and transitively may share some sources of inspiration. Additionally, while not traditional alternate costumes, there are six different-colored Lumas outlined here.

Cyan
Pink
Yellow
Green
Red	Resembles Fire Rosalina in Super Mario 3D World.
Purple
Black
White

Roy

Blue	Based on his appearance in Fire Emblem: The Binding Blade and his appearance in Fire Emblem Awakening as an Einherjar.
Red	Resembles the overworld sprites of enemy units in the Fire Emblem games. Roy can have this color scheme in The Binding Blade's Link Arena mode.
Green	Resembles the overworld sprites of allied units in the Fire Emblem games. Roy can have this color scheme in The Binding Blade's Link Arena mode.
Violet	Resembles Marcus, Roy's guardian and ally in The Binding Blade.
Cyan	Resembles Eliwood, Roy's father, as he appears in Fire Emblem: The Blazing Blade.
Purple	Resembles Zephiel, the main antagonist of The Binding Blade.
Pink	Resembles Cecilia, Roy's tutor and ally in The Binding Blade.
Yellow

Ryu

Seven of Ryu's costumes seem to derive from his alternate colors in Super Street Fighter II Turbo.

White
Grey	Resembles his "Medium Punch" color ("Strong" in reference source).
Cyan	Resembles his "Heavy Punch" color ("Fierce" in reference source). Also resembles his appearance in the Street Fighter Alpha titles.
Black	Resembles his "Light Punch" color ("Jab" in reference source).
Orange	Resembles his "Light Kick" color ("Short" in reference source). Also resembles Ryo Sakazaki, a fighter from SNK's Art of Fighting series.
Blue	Resembles his "Medium Kick" color ("Forward" in reference source).
Green	Resembles his "Heavy Kick" color ("Roundhouse" in reference source).
Purple	Resembles his tenth color in Street Fighter V.

Samus

Orange	Based on the Varia Suit as it appears in Metroid: Other M.
Blue	Based on the Fusion Suit from Metroid Fusion.
Pink	Based on the Gravity Suit's in-game sprite from Super Metroid, but more closely resembles the color scheme of the Varia Suit of the original Metroid when missiles are selected.
Brown	Based on the Dark Suit from Metroid Prime 2: Echoes.
Purple	Based on the Gravity Suit as it appears in Metroid Prime.
Green	Referred to as "Green Samus" by Masahiro Sakurai. The original Super Smash Bros. website referred to this alternate costume as "mass-produced Samus", a reference to the MS-06 Zaku II from the Gundam franchise.
White	Based on the Light Suit from Metroid Prime 2: Echoes.
Black	Resembles a Power Trooper, a Space Pirate copying Samus's Power Beam from Metroid Prime. Replaces her Dark Samus-based costume from Smash 4.

Sheik

Blue	Wears the Stealth set from The Legend of Zelda: Breath of the Wild, including the long white scarf of the Stealth Mask.
Red	Resembles the Stealth set after being dyed red in Breath of the Wild.
Indigo	Resembles her appearance in The Legend of Zelda: Ocarina of Time.
Purple	Resembles the Stealth set after being dyed purple in Breath of the Wild.
Green	Resembles the Stealth set after being dyed green in Breath of the Wild.
Black	Resembles the Stealth set after being dyed black in Breath of the Wild. It is complementary to Link's "Dark Link" costume.
Yellow	Resembles the Stealth set after being dyed light yellow in Breath of the Wild.
White

Shulk

With the exception of his first and last alternate costumes, all of Shulk's alternate costumes are based on the color schemes of his traveling companions from Xenoblade Chronicles. His hair colors now also match these characters.

Red
White	Resembles Mecha-Fiora.
Black	Resembles Dunban.
Orange	Resembles Reyn.
Blue	Resembles Sharla.
Lavender	Resembles Melia.
Yellow	Resembles Riki.
Trunks	Based on Shulk's "Swimsuit" armor set and his appearance with weapons unequipped in Xenoblade Chronicles.

Simon

Brown
Red	Resembles his appearance in Castlevania II: Simon's Quest.
Yellow	Resembles his appearance on the Western boxart for Super Castlevania IV.
Black	Resembles his appearance in Castlevania Chronicles and his in-game appearance in Vampire Killer.
Blue	Resembles his appearance on the Japanese boxart for Super Castlevania IV.
Purple	Resembles Cornell from Castlevania: Legacy of Darkness.
Orange	Resembles his in-game appearance in Castlevania.
Indigo

Snake

Grey	Based on the sneaking suit worn by Solid Snake in Metal Gear Solid 2: Sons of Liberty.
Black	Resembles the Metal camouflage from Metal Gear Solid 4: Guns of the Patriots.
Red	Resembles the Fire camouflage from Metal Gear Solid 3: Snake Eater.
Blue	Resembles the Water camouflage from Snake Eater.
Green	Resembles the Tiger Stripe camouflage from Snake Eater.
White	Resembles the Splitter camouflage from Snake Eater.
Chartreuse	Resembles the Leaf camouflage from Snake Eater.
Brown	Resembles the Animals camouflage from Snake Eater.

Sonic

Blue
Purple	Resembles NiGHTS, a character from Sega's NiGHTS into Dreams. The cuffs are reminiscent of the purple Chaos Emerald.
Cyan	Resembles Classic Sonic from Sonic Generations. The cuffs are reminiscent of his Crystal Ring power-up from Sonic Adventure.
White	Resembles Silver the Hedgehog. The cuffs are reminiscent of the blue Ark of the Cosmos from Sonic Riders: Zero Gravity.
Black	The color scheme most closely resembles Dark Sonic from the Sonic X anime.
Yellow	The cuffs are reminiscent of Silver's bracelets.
Orange	The cuffs are reminiscent of the hand sprite that appears when the player passes through one of Sonic the Hedgehog 2's Special Stage checkpoints.
Green	The cuffs are reminiscent of the hand sprite that appears when the player passes through one of Knuckles the Echidna in Sonic the Hedgehog 2's Special Stage checkpoints.

Toon Link

Green	Based on his appearance in The Legend of Zelda: The Wind Waker.
Red	Resembles Red Link from the Four Swords titles.
Blue	Resembles Blue Link from the Four Swords titles.
Purple	Resembles Purple Link from the Four Swords titles.
Brown	Resembles Link's appearance in The Legend of Zelda.
Black	Resembles Dark Link and the Dark Interlopers from The Legend of Zelda: Twilight Princess.
Grey	Resembles Link's tunic with the Blue Ring equipped in The Legend of Zelda.
Teal	Resembles Link's appearance in The Legend of Zelda: A Link to the Past and its sequel A Link Between Worlds.

Villager

Villager's appearance varies greatly between costumes, with differing eyes, hair, gender, clothing, and skin color. All of Villager's alternate costumes, with the exception of the yellow costume, are based on how the player may look at the start of a new game depending on how they answer questions asked by Kapp'n or Rover in Animal Crossing: Wild World and Animal Crossing: City Folk respectively.

Red	Male villager wearing a "No. 1 Shirt" as he appears in artwork for City Folk.
Pink	Female villager wearing a "Daisy Shirt" as she appears in artwork for Wild World.
Yellow	Male villager wearing a "Racer 6 Tee". The corresponding starting appearance in Wild World and City Folk instead sports the "Paw Tee" and a different hairstyle.
Green	Female villager wearing a "Turnip Top".
Cyan	Male villager wearing a "Blue Tie-Dye Tee" as he appears in artwork for City Folk.
Blue	Female villager wearing a "Rugby Tee".
Purple	Male villager wearing a "Four-Ball Tee". He has darker skin compared to the previous game.
Chartreuse	Female villager wearing a "Yellow Bolero". She has darker skin compared to the previous game.

Wario

Wario alternates between wearing his biker outfit from WarioWare and his overalls from the Mario and Wario Land games.

Blue	Based on his appearance in the WarioWare series.
Classic	Based on his appearance in the Mario and Wario Land series. Referred to as "Overalls Wario" on the Brawl DOJO!!
Red	Combines elements of his red and black costumes from Brawl.
Classic Red	Resembles Mario's appearance in Donkey Kong and one of Wario's alternate colors in Mario Golf.
Yellow	Combines elements of his yellow and green costumes from Brawl.
Classic Cyan	Resembles Mario's appearance on the Japanese boxart for Mario Bros.
Green
Classic Green	Resembles Mario's appearance on the Japanese boxart for Wrecking Crew and Luigi's appearance on the arcade version of Mario Bros.

Wii Fit Trainer

Wii Fit Trainer alternates between the female trainer and the male trainer. Both of them are characters from the original Wii Fit.

Blue	Resembles her appearance in Wii Fit, but with her hairstyle from Wii Fit Plus.
Male	Resembles his appearance in Wii Fit.
Green	Resembles her appearance in Wii Fit Plus and Wii Fit U.
Male Green	Resembles his appearance in Wii Fit Plus and Wii Fit U.
Red	The tank top's color is reminiscent of the Aerobics category.
Male Red	The suit's color is reminiscent of the Aerobics category.
Yellow	Resembles her outfit from Wii Fit Plus that appears during Yoga or Strength Training activity in My Wii Fit Plus mode. The tank top's color is reminiscent of the Balance Games category.
Male Yellow	Resembles his outfit from Wii Fit Plus that appears during Yoga or Strength Training activity in My Wii Fit Plus mode. The suit's color is reminiscent of the Balance Games category.

Wolf

Purple	Based on his appearance in Star Fox Zero.
Brown	Resembles his color scheme in Star Fox Zero and Starlink: Battle for Atlas.
Red	Resembles Andrew Oikonny, one of Wolf's teammates, as he appears in Star Fox: Assault.
Blue	Resembles his blue "Player 2" costume from Assault's Versus Mode.
Green	Resembles his green "Player 4" costume from Assault's Versus Mode.
Orange
Black	Complementary to Fox's "Dark Fox" costume.
Pink	Resembles Pigma Dengar, one of Wolf's former teammates, as he appears in Star Fox: Assault.

Yoshi

Green	Based on a Green Yoshi.
Red	Based on Red Yoshi.
Blue	Based on Blue Yoshi.
Yellow	Based on Yellow Yoshi.
Pink	Based on Pink Yoshi.
Cyan	Based on Light Blue Yoshi.
Purple	Resembles Purple Yoshi.
Crafted	Based on his appearance in Yoshi's Crafted World. While the render has a unique "fuzzy" coating, the in-game model simply uses material shaders to the same effect. His shoes and saddle also have a glossier appearance.

Young Link

Green	Based on his appearance from The Legend of Zelda: Ocarina of Time and its sequel Majora's Mask.
Red	Resembles the Goron Tunic from Ocarina of Time.
Blue	Resembles the Zora Tunic from Ocarina of Time.
White	Resembles Link's tunic with the Blue Ring equipped in The Legend of Zelda.
Pink
Cyan	Resembles Link's appearance in The Legend of Zelda: Breath of the Wild.
Orange
Black	Resembles Dark Link and the Dark Interlopers from The Legend of Zelda: Twilight Princess.

Zelda

Pink	Based on her appearance in The Legend of Zelda: A Link to the Past and A Link Between Worlds.
Red	Resembles her in-game sprite when Link rescues her with the Red Ring equipped in The Legend of Zelda. Similar to the original sprite, her hair is brunette in this costume.
Blue	Resembles her official artwork for The Legend of Zelda: A Link to the Past.
Violet	Based on Adult Zelda in The Legend of Zelda: Ocarina of Time.
Green	Resembles her in-game sprite when Link rescues her with no ring equipped in The Legend of Zelda.
Black	Complementary to Link's "Dark Link" costume.
Purple	Resembles her appearance from The Legend of Zelda: Twilight Princess.
White	Resembles her overworld sprite from A Link to the Past and her white dress from The Legend of Zelda: Skyward Sword.

Zero Suit Samus

Cyan	Based on her appearance in Metroid: Other M and Metroid: Zero Mission.
Blue	Resembles the Zero Suit at the end of Metroid Prime 2: Echoes.
Red	Resembles her leotard at the end of the original Metroid.
Black	Resembles her outfit at the end of Super Metroid.
Green
White	Resembles an outfit from one of the endings of Metroid Fusion.
Shorts Orange	Based on her outfit at the end of Zero Mission.
Shorts Blue	Based on her outfit at the end of Fusion.

Trivia

• In demo versions of Super Smash Bros. Ultimate, several characters had differences in their available costumes and associated portraits compared to the final game:
  • The Ice Climbers' character select portraits always showed Popo in front, although the stock icons changed to reflect which costumes let the player control Nana.
  • Two of Villager's alternate colors and one of Pokémon Trainer's alternate colors had a lighter skin tone compared to the versions used in the final game.
  • Ridley did not have his Meta Ridley costumes available; instead, two palette swaps were present that used the same colors as the Meta Ridley costumes. These costumes are not used in the final game.
  • Mario, Link, Pikachu and Villager used images of their in-game models for character select portraits instead of their official renders.
  • Sonic's 4th alternate costume used a pale blue shade of fur rather than white fur like in the previous game. This was changed back for the final release of the game.
• Some costumes that were shared through pre-release screenshots on the Ultimate site are slightly different than from their appearances in the final build.
  • On Luigi's purple costume, the "L" on his cap was green in screenshots but is purple in the final build.
  • On Wario's yellow overall costume, the buttons on his suspenders were gold in screenshots but are white in the final build.
  • On Wolf's default costume, his jacket and gloves are dark purple, the straps behind his right shin guard are white, and the soles of his boots are red compared to his color scheme in the final build.
• Ultimate is the first game where every character has the same amount of alternate costumes, 8. This does not include Pokémon Trainer having multiple costumes per player, or Mii Fighter costumes.

• 

  The Ice Climbers' demo (top) and final (bottom) costumes.

• 

  Villager's demo (top) and final (bottom) costumes.

• 

  Pokémon Trainer's demo (left) and final (right) costumes.

• 

  Ridley's demo (top) and final (bottom) costumes.