I'm gonna have to go with.... Former Captain of the 5th division in soul society, Sosuke Aizen. This guy is so nice when you meet him, I admit it I liked him BUT as soon as I found out what he was doing my liking went from like to hate but not a hate like the one I have for Gin Ichimaru, that fox faced bastard, ANYWAY, it was like a wow you betrayed me kind of feeling but I still like him as a character but not for what he does in the show.
No really am I the only one that thinks that of Gin Ichimaru? I mean look at the evidence... What about you guys? Who is your favorite villain?