1. Michael Corleone

2. Jimmy Conway

3. Vito Corleone

4. Tony Soprano

5. Paulie Cicero

6. Santino Corleone

7. Max - Once Upon A Time in America

8. Paulie 'Walnuts' Gualteri

9. Sonny Black - Donnie Brasco

10. Uncle Giovanni - Mean Streets

I am cheating, I know. First, I can't count - like the fellas said we could name another twenty
and second some of these guys are very much based on real characters.

Whatever, there are many great and unforgettable characters.