I keep on misreading this thread as roleplaying celebrities -- like, who you'd play if you were sitting around a table with your friends, roleplaying a celebrity that was thrown in with the others in some reality TV show or something.
So mine: I think that I could roleplay a good Vin Diesel. I don't have his build IRL, but that goes for my Mwangi ranger too. It's more about being able to pull off the personality, from what you've seen of them. So sky's the limit!