She's an angel, one of the Fallen. Recently released from the pits of hell. The first thing she needs to do is take possession of a body, and learn how to live like a human. The first body she comes across is that of a prostitute.
As a fallen angel, she's filled with bitterness and hatred. But the essentially humane nature of her host is that of the proverbial whore with a heart of gold. This tempers her hatred, and she remembers what it once felt like to love and protect humans.
Your character (s):
The lowlives in the city. The sinners who seek her out for cheap carnal pleasure. The rapists who see her as a piece of meat. The cheating husbands who want an anonymous piece of ass.
She forgives, she heals, and tries to spread happiness one human at a time. This was once her function in the heavenly order, and that's all she knows now.
I'm not looking for fellow Fallen in this game. She will be the only one in the area.