Pointless data table repository. While I appreciate that some people are enthusiastic about keeping this page up to date, please let me do so myself. Thanks.

Character art

Fighter SSB Melee Brawl SSB4 Ultimate Universe
  Mario            Mario
  Luigi            Mario
  Peach          Mario
  Bowser          Mario
  Dr. Mario        Mario
  Rosalina      Mario
  Bowser Jr.  
(not playable)
     Mario
  Daisy  
(not playable)
 
(not playable)
 
(not playable)
   Mario
  Piranha Plant  
(not playable)
 
(not playable)
   Mario
  Yoshi            Yoshi
  Donkey Kong            Donkey Kong
  Diddy Kong        Donkey Kong
  King K. Rool  
(not playable)
 
(not playable)
 
(not playable)
   Donkey Kong
  Link            The Legend of Zelda
  Zelda          The Legend of Zelda
  Sheik          The Legend of Zelda
  Ganondorf          The Legend of Zelda
  Young Link      The Legend of Zelda
  Toon Link        The Legend of Zelda
  Samus            Metroid
  Zero Suit Samus        Metroid
  Ridley  
(not playable)
 
(not playable)
 
(boss)
 
(boss)
   Metroid
  Dark Samus  
(not playable)
 
(Assist Trophy)
   Metroid
  Kirby            Kirby
  Meta Knight  
(not playable)
       Kirby
  King Dedede  
(not playable)
       Kirby
  Fox            Star Fox
  Falco          Star Fox
  Wolf    
(not playable)
   Star Fox
  Pikachu            Pokémon
  Jigglypuff            Pokémon
  Mewtwo    
(not playable)
     Pokémon
  Pichu    
(not playable)
 
(not playable)
   Pokémon
  Pokémon Trainer    
(not playable)
   Pokémon
  Squirtle  
(not playable)
 (Pokémon Trainer)  
(not playable)
 (Pokémon Trainer)  Pokémon
  Ivysaur  (Pokémon Trainer)  
(not playable)
 (Pokémon Trainer)  Pokémon
  Charizard  
(Poké Ball)
 
(Poké Ball)
 (Pokémon Trainer)    (Pokémon Trainer)  Pokémon
  Lucario        Pokémon
  Greninja      Pokémon
  Incineroar    Pokémon
  Captain Falcon            F-Zero
  Ness            EarthBound
  Lucas        EarthBound
  Ice Climbers      
(not playable)
   Ice Climber
  Marth          Fire Emblem
  Roy        Fire Emblem
  Ike        Fire Emblem
  Robin      Fire Emblem
  Lucina      Fire Emblem
  Corrin      Fire Emblem
  Chrom  
(not playable)
   Fire Emblem
  Byleth    Fire Emblem
  Mr. Game & Watch          Game & Watch
  Pit  
(not playable)
       Kid Icarus
  Palutena  
(not playable)
     Kid Icarus
  Dark Pit      Kid Icarus
  Wario  
(not playable)
       Wario
  Olimar  
(not playable)
       Pikmin
  R.O.B.        R.O.B.
  Villager  
(not playable)
     Animal Crossing
  Isabelle  
(Assist Trophy)
   Animal Crossing
  Little Mac  
(Assist Trophy)
     Punch-Out!!
  Wii Fit Trainer      Wii Fit
  Shulk      Xenoblade Chronicles
  Pyra    Xenoblade Chronicles
  Mythra    Xenoblade Chronicles
  Duck Hunt      Duck Hunt
  Inkling  
(not playable)
   Splatoon
  Min Min    ARMS
  Snake      Metal Gear
  Sonic        Sonic
  Mega Man      Mega Man
  Pac-Man      Pac-Man
  Ryu      Street Fighter
  Ken  
(not playable)
   Street Fighter
  Cloud      Final Fantasy
  Sephiroth    Final Fantasy
  Bayonetta      Bayonetta
  Simon    Castlevania
  Richter    Castlevania
  Joker    Persona
  Hero    Dragon Quest
  Banjo & Kazooie    Banjo-Kazooie
  Terry    Fatal Fury
  Steve    Minecraft
  Kazuya    Tekken
  Mii Brawler      Super Smash Bros.
  Mii Swordfighter      Super Smash Bros.
  Mii Gunner      Super Smash Bros.

Characters in debut order

              
                      
      
                      
                    
                      
                    
                  
                      
                    
                    
                    
         
Hero sorted based on Erdrick, the oldest of the 4 represented.
                      
                    
                    
                    
                    
    
With alternate costume characters sorted separately when they debuted at a different time.

Character rights

Includes DLC Mii costume characters since the DLC pages list credits individually.

Character(s) Copyright
                                          
Majora's Mask, K.K. Slider, Toad, Viridi, Takamaru, Ashley, Ninjara, Squid Sisters
© Nintendo
    © HAL Laboratory, Inc. / Nintendo
           
Team Rocket
© Pokémon.
© Nintendo / Creatures Inc. / GAME FREAK inc.
 
Flying Man
© Nintendo / SHIGESATO ITOI / APE inc.
  © SHIGESATO ITOI / Nintendo
        
Black Knight
© Nintendo / INTELLIGENT SYSTEMS
   
Dunban, Rex
© Nintendo / MONOLITHSOFT
   
Goemon, Bomberman
© Konami Digital Entertainment
 
Akira Yuki, Jacky Bryant, Miles "Tails" Prower, Knuckles the Echidna
© SEGA
 
X, Proto Man, Zero, MegaMan.EXE, Monster Hunter gear, Felyne, Arthur
© CAPCOM CO., LTD. ALL RIGHTS RESERVED.
  
Heihachi Mishima, Gil
© BANDAI NAMCO Entertainment Inc.
   © CAPCOM U.S.A., INC.
  
Chocobo, Barret Wallace, Tifa Lockhart, Aerith Gainsborough
FINAL FANTASY VII :
© 1997 SQUARE ENIX CO., LTD. All Rights Reserved.
  © SEGA
© Nintendo
 
Protagonist (Persona 3), Protagonist (Persona 4), Teddie, Morgana
© ATLUS © SEGA
 
Slime, Martial Artist, Veronica
© ARMOR PROJECT / BIRD STUDIO / SQUARE ENIX
  © Microsoft
 
Nakoruru, Ryo Sakazaki, Iori Yagami
© SNK CORPORATION
  © Mojang AB
Creeper, Pig, Diamond Armor © 2018 Mojang AB and Mojang Synergies AB. MINECRAFT and MOJANG are trademarks or registered trademarks of Mojang Synergies AB.
Lloyd Irving © KOSUKE FUJISHIMA
© BANDAI NAMCO Entertainment Inc.
Geno "Super Mario RPG: Legend of the Seven Stars" Character:
©SQUARE ENIX CO., LTD. All Rights Reserved.
Sans © Toby Fox
Altaïr Ibn-La'Ahad, Rabbid © Ubisoft Entertainment.
Cuphead Cuphead and associated properties © 2019 StudioMDHR Entertainment, Inc.
Vault Boy Fallout® 4 ©2020 Bethesda Softworks LLC, a ZeniMax Media company. All Rights Reserved.
Travis Touchdown © Marvelous Inc. / Grasshopper Manufacture Inc.

Spirit events/gifts which add new 3rd-party content with new copyright info not listed above:

Series Event name Copyright
Tetris Attack of the Tetriminos! Tetris® and the Tetrimino shapes are trademarks of Tetris Holding, used with permission.
Daemon X Machina Arsenals at the Ready! DAEMON X MACHINA ©2019 Marvelous Inc.
River City River City Smash © ARC SYSTEM WORKS
Cuphead Ready? Wallop! Cuphead and associated properties © 2019 StudioMDHR Entertainment, Inc.
Warframe Spirits in Black Warframe® : © 2020 Digital Extremes Ltd. All rights reserved.
Mana The Spirits of Mana © 1995, 2020 SQUARE ENIX CO.,LTD. All Rights Reserved.
Octopath Traveler Second Anniversary of OCTOPATH TRAVELER © 2018, 2019 SQUARE ENIX CO., LTD. All Rights Reserved.
Hyrule Warriors Hyrule Warriors: Age of Calamity © Nintendo © KOEI TECMO GAMES CO., LTD. All rights reserved, Licensed by Nintendo.
Bravely Default BRAVELY DEFAULT II © 2021 SQUARE ENIX CO., LTD. All Rights Reserved.
Persona 5 Strikers Sophia gift spirit ©ATLUS. ©SEGA. / ©KOEI TECMO GAMES. All rights reserved.

Any other copyright info from trailers:

Trailer(s) Copyright Notes
Sephiroth reveal trailer (website ver.)
Final Fantasy VII Mii costume trailer
FINAL FANTASY VII © 1997 SQUARE ENIX CO., LTD. All Rights Reserved.
CHARACTER DESIGN: TETSUYA NOMURA
LOGO ILLUSTRATION: ©1997 YOSHITAKA AMANO
Amano designed the particular Meteor logo for Final Fantasy VII and is credited for its use. These copyright listings were not used on Cloud's SSB4 reveal trailer.
Hero reveal trailer © SUGIYAMA KOBO ℗ SUGIYAMA KOBO
♪ Tokyo Metropolitan Symphony Orchestra
Orchestral versions of the Dragon Quest "Overture" and "Adventure" tracks owned by composer and performed by said orchestra.