I would have to say Pride because I'm to stubborn to admit that anyone is more badasser than Pride even doe I do know there is more badass characters than Pride but the two I would have to say would be Newdeath and Sonata.
@paladin: Personally I would say Keith because he has a creepy yet polite element to him. It makes it really hard for people to say if he is good or bad and they don't realize how dangerous he can be until its too late. I also prefer his more indirect approach. He's like a puppet master of sorts. Paladin I admit is badass but he doesn't have the element of mystery that Keith does and that gives him some sort of suspense.