The Taxi Driver from Taxi Driver.
Deniro Killed! (literally)
"You talking to me?"
Henry Hill in Goodfellas.
Henry didn't kill, although he might get killed when Jimmy Conway gets out in 2004.
"What do you mean I'm funny?"
Donnie Brasco from Donnie Brasco.
Fugetaboutit.
Toby N Tucker from U-Turn.
"The name is Toby N Tucker, people 'round here call me TNT. Know why?"
"Because they're not very imaginative?"
"No! Because I'm like dynamite boy! And when I go off someone gets hurt!!"
Neo from the Matrix.
"Whoa"
Actually Keanu was just here last week.
Don Corleone from The Godfather.
"I'll make him an offer he can't refuse."
I could go on and on about who I would want to be. This question is too hard for someone as into movies as I am. But thanks for asking anyway.