Suggestions by @lukejamesbennett

Boris Karloff

as Colossus in Marvel Cinematic Universe (Golden Age of Hollywood)

Robert Montgomery

as Deadpool in Marvel Cinematic Universe (Golden Age of Hollywood)

William Powell

as Deadpool in Marvel Cinematic Universe (Golden Age of Hollywood)

Lee Tracy

as Deadpool in Marvel Cinematic Universe (Golden Age of Hollywood)

Cary Grant

as Deadpool in Marvel Cinematic Universe (Golden Age of Hollywood)

Edward Arnold

as Beast in Marvel Cinematic Universe (Golden Age of Hollywood)

Edward Everett Horton

as Beast in Marvel Cinematic Universe (Golden Age of Hollywood)

Adolphe Menjou

as Beast in Marvel Cinematic Universe (Golden Age of Hollywood)

Melvyn Douglas

as Beast in Marvel Cinematic Universe (Golden Age of Hollywood)

William Powell

as Beast in Marvel Cinematic Universe (Golden Age of Hollywood)

John Barrymore

as Beast in Marvel Cinematic Universe (Golden Age of Hollywood)

Elmo Lincoln

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

Johnny Weissmüller

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

Buster Crabbe

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

Errol Flynn

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

Cary Grant

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

George Raft

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

Gary Cooper

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

James Cagney

as Gambit in Marvel Cinematic Universe (Golden Age of Hollywood)

Dick Powell

as Cyclops in Marvel Cinematic Universe (Golden Age of Hollywood)