Darth Vade

Duh.

And you thought I wouldn't include him. Let's face it, he's the live-action Lex Luthor. He's the standard on which all other Evil is based. And no, I won't include Boba Fett. All you fans can just admit to yourself that he's just a cronie who gets whacked after a grand total of about two minutes of screen time. (And i do not accept the "...but in the book..." justification. Get over it, I don't care. Can you tell I've been arguing this for far too long?)

aside: ever noticed how buffed and shiny his helmet is by the third film?