My thought is an Eisen Jenny/Monster Hunter.  The inspiration being something of a Vampire Hunter type character, someone who pursues monsters who are able to pass as human (or failing that, people who use monsters for their own benefit).  But also someone who uses her body as a tool and to hide her presence.<br/><br/>Her story (and how she gets involved) would probably be through the pursuit of some particular villain or other.<br/><br/>Though it would also be fun to take something from a splatbook if I could figure out how to spin it.