The Anti-Villain is a villain with heroic goals, personality traits, and virtues. Their desired ends are good, but their means of getting there are evil. Alternatively, their desired ends are evil, but they are far more ethical or moral than most villains and they thus use fairly benign means to achieve it, and can be downright heroic on occasion. They reach a kind of critical mass that makes them more good than normal villains but not quite heroes, blurring the line between hero and villain the same way an Anti-Hero does.