Suggestions by @cutmanisback

Industrial Light & Magic

as Special Effects in Transformers: Rise of the Beasts (1993)

Roland Emmerich

as Director in Transformers (1997)

The Once-ler

as Fake Deaths in The Lorax: The Once-ler's Revenge

Kenny McCormick

as TV in Mortal Kombat 1 (Guest Characters)

Kyle Broflovski

as TV in Mortal Kombat 1 (Guest Characters)

Stan Marsh

as TV in Mortal Kombat 1 (Guest Characters)

Eric Cartman

as TV in Mortal Kombat 1 (Guest Characters)

Townsend Coleman

as Sussy Michelangelo in Teenage mutant Ninja turtles: The Evil Enverse

Shamon Brown Jr.

as Michelangelo in Teenage mutant Ninja turtles: The Evil Enverse

Micah Abbey

as Donatello in Teenage mutant Ninja turtles: The Evil Enverse

Brady Noon

as Ralphael in Teenage mutant Ninja turtles: The Evil Enverse

Nicholas Cantu

as Leonardo in Teenage mutant Ninja turtles: The Evil Enverse

Nicholas Cantu

as Leonardo in Cringe War 2 Season 2: Howard's Return

Goldie (Rock-A-Doodle)

as Heroes in The Crossover Movie

Peepers

as Heroes in The Crossover Movie

Snipes

as Heroes in The Crossover Movie

Patou

as Heroes in The Crossover Movie

Chanticleer

as Heroes in The Crossover Movie

Edmond (Rock-A-Doodle)

as Heroes in The Crossover Movie

The Touch

as Soundtrack in Kaufman Uprising: End of Prime