Mimasaka Fuu

Soya Mimasaka's daughter. Her father is a police officer, but she idolizes 'Phantom Thief Riverlake' and calls herself 'Phantom Thief Beaver', committing petty crimes. Her father, Mimasaka, thinks she's cute and leaves her alone. Later, when it is revealed that the Phantom Thief Riverlake is a balding middle-aged man, she stops being a Riverlake fan. However, from volume 7 onwards, she becomes close with the nipple-tasting uncle.