The ones that think that they are doing it for the grater good.

The kind of antagonist that I like are the one's that has a troubling past or are doing wrong for someone and the one's like Lelouch from Code Geass an "Anti- Hero"

Like I myself I will always go for the hero if the villain is just some retard that does shit for the fun of it >.> but I personally like people like Light in death note until he went mad with power (dumb question tbh but I felt that we needed a thread)