It was actually a toss-up between Amon and L, from Death Note. It's too bad I can't have two answers for this question, actually, because it would be nice to have the option.

I'm sure the physical stuff might get old after a while, and then I'd want to turn to some philisophical discourses about things, and well....Amon is just a little too taciturn for that kind of stuff, maybe. :D