Suggestions by @sawickifr33

Mel Blanc

as Porky Pig in Space Jam (1971)

Mel Blanc

as Rocky and Mugsy in Space Jam (1971)

Frank Welker

as Monster in The Mixed Up Story of Winnie the Pooh

No Voice Actor

as Robin Hood in The Mixed Up Story of Winnie the Pooh

Bob Bergen

as Narrator in The Many Adventures of Winnie the Pooh (1997)

Jeff Bennett

as Daffy Duck in Adventures of Looney Tunes

Eric Bauza

as Daffy Duck in Adventures of Looney Tunes

Dee Bradley Baker

as Daffy Duck in Adventures of Looney Tunes

Jeff Bergman

as Daffy Duck in Adventures of Looney Tunes

Steve Carell

as Elmer Fudd in Adventures of Looney Tunes

Jeff Bergman

as Elmer Fudd in Adventures of Looney Tunes

Billy West

as Elmer Fudd in Adventures of Looney Tunes

Billy Crystal

as Elmer Fudd in Adventures of Looney Tunes

Neil Patrick Harris

as Bugs Bunny in Adventures of Looney Tunes

Jeff Bergman

as Bugs Bunny in Adventures of Looney Tunes

Eric Bauza

as Bugs Bunny in Adventures of Looney Tunes

Billy West

as Bugs Bunny in Adventures of Looney Tunes

Eric Bauza

as Sylvester in Adventures of Looney Tunes

Jeff Bennett

as Sylvester in Adventures of Looney Tunes

Bill Farmer

as Sylvester in Adventures of Looney Tunes