Demon Cannon User is a girl with short black hair and green eyes and glasses. Her outfit consists of a short, black kimono with multiple zippers and a belt with pouches attached. She also wears knee-high stockings and black boots that come up just over her ankles. DCU wears star-shaped hair clips in her hair, and is also the first character ever shown to possess cat ears and a tail.
Her weapon is a long, thin, black cannon.