Belle or her full name La Belle Dame Sans Marci is a very enterpricing and beautiful woman. She is what ever you want her to be as long as you can pay, killer, thief, bounty hunter etc.
If you have the money she will do pretty much everything.
She takes trophies from her victems and incorporate it in to her self, so if she takes a pelt from a werewolf she gets their speed and healing power etc. She has a variety of things that she has incorporated in to her self by magic.