Magpie's true name is Margaret Sorrow. She was a chronic kleptomaniac and inmate at Black Gate Prison. While serving her time in the prison, she took part in experiments in mind manipulation conducted by Joe Braxton and Bethany Ravencroft. They used a helmet-like device on her to wipe away her original memories.

At night, as Magpie, she wears a short white wig, black makeup around her eyes and a tight black outfit made of latex. Her uniform consists of black feather ornaments on her shoulders.