Game: Final Fantasy IX
What Makes Him Bad: Eradicating the world so that it can't go on without him.
What Makes Him Cool: Being a complete and utter psychopath doesn't keep Kuja from being refined and stylish.

Kuja is the more ladylike Sephiroth, who's so narcissistic he can't stand to have the world go on without him should he cease to exist. So he decides on destroying the universe so that no one can enjoy a world without him in it. And you thought reality TV stars were selfish.