One scary thing about villains that I think is good to remember, is that they are not necessarily bad people. They can be the hero from a different point of view. Just because he is against the hero in the story doesn't necessarily make him evil as a person. I mean it's like history is written by the winner so that the other guys looked like the bad guys and the other guys were evil. Well it all comes down to a point of view. That's something I think is important too.
I don't know if anyone had mentioned it there was just too much to read for my attention span xD