Editing Byleth (SSBU)

|dairdmg={{ShortHopDmgSSBU|19}}

|dairdesc=Swings Aymr downward. Deals heavy damage to shields and has long range. Among down aerials, it is the strongest [[meteor smash]] in the entire game, with the sweetspot KOing grounded opponents starting at 85%. However, it has an extreme amount of start-up and ending lag, it only autocancels from a double jump, and its landing lag is among the highest out of any conventional down aerial in the entire game.

|pummeldmg=1.5%

|fthrowname= 

|fthrowdmg=3% (hit), 3% (throw)

|Final||{{SSBU|Master Hand}} and {{SSBU|Crazy Hand}}||{{SSBU|Final Destination}}||''{{SSBUMusicLink|Fire Emblem|Code Name: F.E.}}''||The player has {{head|Marth|g=SSBU|s=20px}} Marth, {{head|Roy|g=SSBU|s=20px}} Roy, {{head|Ike|g=SSBU|s=20px}} Ike, {{head|Robin|g=SSBU|s=20px}} Robin, and {{head|Corrin|g=SSBU|s=20px}} Corrin as CPU allies with 30 HP each. The five previous opponents now allied with Byleth reference the recruitment system in ''Three Houses'' and how certain students can be persuaded to join their side after being defeated in Part 2.

|}

[[Credits]] roll after completing Classic Mode. Completing it as Byleth has ''{{SSBUMusicLink|Fire Emblem|Paths That Will Never Cross}}'' accompany the credits.

*Byleth's internal codename is "master", referencing their role as a professor in ''Fire Emblem: Three Houses''.

*According to Sakurai, the development of Byleth began while ''Fire Emblem: Three Houses'' was still in development. He had to play the game in secret from the other employees due to the game still being in development.<ref>https://twitter.com/PushDustIn/status/1455931694175817730</ref>

**Despite the fact that male and female Byleth have different names in Japanese, the [[announcer]] and English-written UIs (such as the [[versus splash screen]] and [[damage meter]]) will call both of them by their shared English name, unlike with other characters such as {{SSBU|King K. Rool}} and {{SSBU|Lucina}} in the Japanese version, or unlike with other gender-selectable characters in French, Spanish, German, Italian and Russian. However, this is also similar to {{SSBU|Young Link}} and {{SSBU|Lucas}} being still called by the announcer with their English name.

*Male and female Byleth have slightly different idle stances; female Byleth holds the Sword of the Creator with its tip pointed upwards, while male Byleth holds it with its tip pointed downwards. All animations that can be played from their stand animations (like their idle animations) are subsequently affected through the animation blending. Additionally, their idle pose and [[victory pose]]s are different between each other.

*According to Sakurai's column, the reason for Byleth's use of the Hero's Relics was to differentiate him from all the other sword fighters.<ref>https://nintendoeverything.com/sakurai-on-the-creation-of-byleth-in-super-smash-bros-ultimate/?fbclid=IwAR04CXGocnLzKdc6Zmb_JJ5Zkjf2FImrITmsODwe70k-Pn8Deho4BidopOM</ref>

*Byleth is one of the few characters who occasionally says something after being Blast KO'd: male Byleth will shout "Not my best!", while female Byleth will shout "Forgive me...!"

*Oddly, if Byleth charges a forward smash while holding a [[Death's Scythe]], the charging sound effect will not play.

**Additionally, he will not vibrate in place while charging. This also applies to {{SSBU|Zero Suit Samus}} if she charges a smash attack while holding a [[Star Rod]].