Tsuchiya is an esper and a former member of Claw who was part of the upper echelon called "Scar". Tsuchiya has bobbed black hair that flares out to either side, forming a bell shape. She has prominent lips and heavy eyebrows, and she bears a scar at the top of her right cheek. Her body is rather muscular, and she wears a light tank top over a black long-sleeved shirt, light pants, and plain black sneakers. Her bust is more prominent in the anime. Tsuchiya is a confident, strong-willed and quite honorable girl who acknowledges Mob as a gentleman, since he initially refused to attack her due to her being a woman, and encourages him to attack her with everything he's got, as she wanted to have a fair fight with him. She seems to be close to Mukai, since she was stirred into action when Mob destroyed Mukai's dolls. She does not take kindly to being called "auntie".