Role in which another actor/actress Would have been PERFECT (different era)

Part I:

Which role would an actor or actress have been PERFECT for, but the person is from a different era in Hollywood?

Part II:

Any actor or actress who should have played a part in a film and could have because they were in their prime at the time?

Part I: Ben Affleck in 1940s Hollywood.

Part II: Tom Hanks in "Hook" as Peter Panning/ Peter Pan