Since I can't possibly choose a favorite male character from Supernatural...
Orson from Record of Lodoss War
He's a berserker who is incapable of emotion. What's not to love?
Favorite Male Harry Potter Character? - Draco Malfoy
As is often the case, the accidental antagonist turns out to be the most complex character, and therefore the most interesting (at least for me). Think about it, who's more interesting Naruto or Sasuke? Aang or Zuko? Harry or Draco?
We KNOW all of Harry's thoughts and feelings - the story is about him, we can see each thought as he has it...Draco is a conflicted mess, leading himself down a dark path because he was both raised to do so, and because he had his feelings hurt when he was eleven. Like Harry, he's in way over his head, but unlike Harry, he does not have the moral fortitude nor courage to pull himself out of the muck. Draco desperately needs someone to rescue him, but he's surrounded by people who would prefer to hold him under.
Don't get me wrong, Draco annoys the crap out of me every time he opens his mouth in the books - or, at least books 1-5 - but I absolutely love him in 6 and 7, when Rowling finally gives us a glimpse of what's behind the facade.