Shadow came to the JWF with a whole history of problems. Whilst growing up she suffered abuse beyond comparison from her parents who often threw things at their child or bit her when they were angry (which was most of the time). Shadow spent many years suffering at the hands of her torturous parents, and when she was old enough to realize she wouldn't be missed she ran away from home hoping that things would all calm down for her, but they didn't. Her violent past followed her around from town to town, street to street.
Soon Shadow herself had turned from the abused to the abuser.
As the years past her violent natures lead her towards someone who enjoys pain, someone who stares it deep into the eyes and comes back for more. That someone was Xavier. He helped her learn to channel her aggressive outbursts in the 'correct way, towards the roster of the JWF and a partnership was born.
Shadows goal is simple - cause pain, suffering and misery to all of those who dare stand in her way.