Gothica was my superhero persona for Super Power Island! She controls Shadows, and has psychometry. Even though those are not the powers you get in the game sadly :(
Step One: Get Bangs from goth girl in sewer of Early Pop. Get her shirt too. And skirt if you want a skirt not pants.
Step two: Get hair from teen girl in Vampire's curse. Get her boyfriend's black pants if you want pants.
Step three: Get purple cape from superhero shop.
Step Four: Get Police Belt. This can be done by dialing 911 on the Nabooti phone. Or MAP.