Suggestions by @jurassicjohnny

Tharja

as DLC Newcomers in Super Smash Bros. VI

Pauline (Super Mario)

as DLC Newcomers in Super Smash Bros. VI

Chibi-Robo

as Assist Trophies in Super Smash Bros. VI

FAKE

as Olimar in Super Smash Bros: The Movie

Debi Derryberry

as Lucas in Super Smash Bros: The Movie

Roxas

as DLC Echo Fighters in Super Smash Bros. VI

Zeraora

as DLC Echo Fighters in Super Smash Bros. VI

Demise

as DLC Echo Fighters in Super Smash Bros. VI

Oscar Isaac

as Falco in Super Smash Bros: The Movie

Jason Ritter

as Ice Climbers in Super Smash Bros: The Movie

Kate Micucci

as Ice Climbers in Super Smash Bros: The Movie

Dragon Sound Effects

as Ridley in Super Smash Bros: The Movie

Robert Pattinson

as Wolf in Super Smash Bros: The Movie

Michele Knotz

as Jigglypuff in Super Smash Bros: The Movie

Kazumi Totaka

as Yoshi in Super Smash Bros: The Movie

Kotaro Watanabe

as Mewtwo in Super Smash Bros: The Movie

Rina Hoshino

as Mewtwo in Super Smash Bros: The Movie

Steve Buscemi

as The Koopalings in Super Smash Bros: The Movie

Rosearik Rikki Simons

as The Koopalings in Super Smash Bros: The Movie

Richard Steven Horvitz

as The Koopalings in Super Smash Bros: The Movie