Suggestions by @redhatcast

Nickelodeon

as Production company in Teenage Mutant Ninja Turtles

Score: 0

Kevin Michael Richardson

as Slash in Teenage Mutant Ninja Turtles

Score: 0

Jim Carrey

as Rat King in Teenage Mutant Ninja Turtles

Score: +1

Josh Brener

as Tony Stark/Iron Man in Iron Turtle (Phase 1, Movie 1)

Score: +1

Alan Lee

as Keno in Teenage Mutant Ninja Turtles

Score: +2

Alan Lee

as Keno in Teenage Mutant Ninja Turtles

Score: -1

Jason Griffith

as Leo (Mirage) in TMNT: Into the Turtle Verse

Score: +2

Joe Keery

as Casey Jones in Teenage Mutant Ninja Turtles

Score: +1

Kaitlyn Dever

as April O Neal in Teenage Mutant Ninja Turtles

Score: +1

Hoon Lee

as Shredder in Teenage Mutant Ninja Turtles

Score: +1

Brian Tee

as Splinter in Teenage Mutant Ninja Turtles

Score: +1

Michael Cera

as Michealangelo in Teenage Mutant Ninja Turtles

Score: +1

Jensen Ackles

as Rapheal in Teenage Mutant Ninja Turtles

Score: +1

Sam Marin

as Donnatello in Teenage Mutant Ninja Turtles

Score: +1

Eric Bauza

as Leonardo in Teenage Mutant Ninja Turtles

Score: +1

Jim Carrey

as Waluigi in Characters Who Should Be in the Mario Movie 2

Score: +2

William Dafeo

as Waluigi in Characters Who Should Be in the Mario Movie 2

Score: +1

No Voice

as Cj in Teenage Mutant Ninja Turtles

Score: +1

Andrew Garfield

as John in Teenage Mutant Ninja Turtles

Score: +1

Hoon Lee

as Shredder in Teenage Mutant Ninja Turtles

Score: +2