Suggestions by @jurassicjohnny

Medeus

as Bosses in Super Smash Bros. VI

Porky Minch

as Bosses in Super Smash Bros. VI

Eternatus

as Bosses in Super Smash Bros. VI

Giga Bowser

as Bosses in Super Smash Bros. VI

MAGOLOR

as Bosses in Super Smash Bros. VI

Mother Brain

as Bosses in Super Smash Bros. VI

Calamity Ganon

as Bosses in Super Smash Bros. VI

Dino Piranha

as Bosses in Super Smash Bros. VI

Duon

as Bosses in Super Smash Bros. VI

Galleom

as Bosses in Super Smash Bros. VI

Crazy Hand

as Bosses in Super Smash Bros. VI

Master Hand

as Bosses in Super Smash Bros. VI

Infinite (Sonic Forces)

as Assist Trophies in Super Smash Bros. VI

Nintendogs

as Assist Trophies in Super Smash Bros. VI

Freddy Fazbear

as Assist Trophies in Super Smash Bros. VI

Goro Akechi

as Snake codec special characters in Super Smash Bros. VI

Angry Birds

as Assist Trophies in Super Smash Bros. VI

Hammer Bros.

as Assist Trophies in Super Smash Bros. VI

Blooper

as Assist Trophies in Super Smash Bros. VI

Birdo

as Assist Trophies in Super Smash Bros. VI