Game: World of Warcraft
What Makes Him Bad: Master and lord of the Scourge.
What Makes Him Cool: He was able to rule telepathically from a frozen throne. Can you do that?

Defeating the Lich King is an undertaking in itself, and for good reason. He singlehandedly rules the Scourge and has the death of Arthas and destruction of Frostmourne on his hands. And you still wanna raid with this guy? You're gonna have a bad time.