How about Joe Pesci playing the role of Vito the godfather.

Joke aside, I think Joe Pesci could have played the role of Sonny. They both were short tempered. Compare these two scenes Sonny hitting the cameraman trying to take pictures in connie's marriage and Pesci in Casino hitting his man with the phone and slapping him when he goes back to Pesci after being chucked out of casino. Also when sonny fight with connie's husband, same thing pesci would have done.