Ember Firebrand

A wildly mad scientist, Ember has forgone pretty much all morals and has embraced the madness. Her great grandfather made a pact with Lucifer to allow him to invent a teleporter. The only catch was that he was driven mad and his soul now belonged to Lucifer. That madness has transferred over to his descendants. The firebrand line is known throughout the world for their brilliance despite the madness. You are Ember's assistant (think Dr Frankenstein and Ivor) and you are the only remaining voice of reason for Ember.