Suggestions by @dmcmusiclover

Scar (The Lion King)

as Bowser in Disney Smash Bros

Score: +2

Kessie (Winnie the Pooh)

as Kazooie in Disney Smash Bros

Score: +1

Jake Jr.

as Isabelle in Cartoon Network Smash Bros

Score: +1

Lara Jill Miller

as Penny Crygor in Super Mario Bros Movie Series

Score: +1

Tara Strong

as Ashley in Super Mario Bros Movie Series

Score: +1

Emma Stone

as Princess Daisy in Super Mario Bros (Animated Film)

Score: +1

Anna Kendrick

as Princess Daisy in Super Mario Bros (Animated Film)

Score: +1

Nika Futterman

as Princess Daisy in Super Mario Bros (Animated Film)

Score: +1

Grey DeLisle

as Toadette in Super Mario Bros (Animated Film)

Score: +1

John Cena

as Bowser in Super Mario Bros (Animated Film)

Score: +1

Seth Rogen

as Donkey Kong in Super Mario Bros (Animated Film)

Score: +4

Keegan-Michael Key

as Toad in Super Mario Bros (Animated Film)

Score: +2

Sebastian Maniscalco

as Foreman Spike in The Super Mario Bros Movie 2

Score: +1

Fred Armisen

as Cranky Kong in The Super Mario Bros Movie 2

Score: +1

Kevin Michael Richardson

as Kamek in The Super Mario Bros Movie 2

Score: +1

Seth Rogen

as Donkey Kong in The Super Mario Bros Movie 2

Score: +1

Danny DeVito

as Wario in The Super Mario Bros Movie 2

Score: +1

Jack Black

as Bowser in The Super Mario Bros Movie 2

Score: +1

Jenny Slate

as Princess Daisy in The Super Mario Bros Movie 2

Score: +1

Cy-Bug Queen

as Dark Samus in Disney Smash Bros

Score: 0