In my current story I do have good guys versus bad guys, but it's not as clear as it should be. My main characters are twins and one becomes the hero and one becomes the villain, but that's no reason to totally hate him. I'm actually a fan of the sympathetic villain. You know, the one where you know you should hate but end up hoping that - somehow - he will succeed (even if you know that's never going to happen).
So, my dillema is that I've got to figure out how to make my villain sympathetic (especially since half the stories going to be told from his POV).
What makes a villain sympathetic?
It could be his backstory? The goal that he's aiming for is relatively good (in his own mind or morals) but the way he's going about achieving them is not the best?
I actually prefer sympathetic villains than 100% evil any day. I absolutely love japanese horror movies for this reason. Just look at any of those movies and by the end you'll end up pitying the ghosts that are doing all the killing.
What do you like in villains? Do you prefer 100% evil doers or ones you can feel sorry for? How do you tackle writing sympathetic villains?