The Soul Eaters Series
Meet Meda. She eats people.
Not literally... technically, she eats their souls. She's nice about it, though. She only eats the souls of people who really deserve it. If she enjoys it a little too much, well, what are you going to do? She can’t help being a bad guy. She was born that way. Besides, it's not like she knows any different. She's all alone. No family. No friends. Only the hunger. Only the need to feed.