Black Mamba

From publisher blurb:

Jessica grew up on the street in one roughest low income housing areas in Megatropolis, she doesn’t give respect, it either has to be earned or taken. She has a mouth that won’t quit with a nasty right hook to back it up. She is loyal and will not leave a friend in trouble, but if you have wronged her, she will go out of her way to pay you back tenfold.

A perfect free agent who can dropped into your campaign to be hired out as muscle to local crime bosses or criminal organizations that can afford her rate.