Xur; exile, traitor, and former cult leader. The Last Starfighter. "Greetings, Starfighter! You have been recruited by the Star League to defend The Frontier against Xur, and the Ko-Dan armada!" ~ Starfighter video game.
Al Swearengen. Brothel owner, saloon keeper, murderer, drug dealer, Machiavellian mastermind, and ultimate badass on Deadwood. "I'm a purveyor of spirits, Cy, and when chance affords, a thief. But, I ain't no fuckin' hypocrite." ~ Al Swearengen
Kodos. One half of the finest extraterrestrial invasion force ever (except maybe Invader Zim)! The Simpsons.
Ron Richardson (below, right). Advertising executive, and sexual harasser. Mr. Mom. "What did you use, a .38?" ~ Ron Richardson "Thirty-eight, thirty-nine, whatever it took." ~ Caroline Butler
Uriah the Hittite (below, left); probably not the first person to be screwed over by his government, definitely not the last. David and Bathsheba.
X (a.k.a. Mr. X), government assassin, manipulator, whistle-blower . X-Files. "...I used to be you. I was where you are now. But you’re not me, Mulder. I don’t think you have the heart. Walk away. Grieve for Scully and then never look back. You will be able to live with yourself, Mulder... on the day you die." ~ X to Agent Mulder