1, Tywin Lannister = Not sure if this counts because of T.V medium. But there is no one id rather have in control.Every Gang needs a leader why not have one of the greatest political/ Military Minds in the history of Westeross. Lord Tywin is as relentless and implacable as a glacier. If there is one man in control of the "Grand Strategy" It is Tywin.
2, The Joker = Everyone needs a wild card and some comic relief and the Clown Prince Of Crime is most certainly the best Wild Card in the business. Well he is damn sure the craziest.
3, Sauron= If shit is gonna go down i want the guy who has the one ring to rule them all.
4, Thanos + Infinity Gauntlet= You always need a Trump Card.