He was a demon affiliated with the Twelve Kizuki, holding the position of Lower Rank Five (下か弦げんの伍ご, Kagen no Go?) Rui is a boy of short stature and a small physical build. His skin is milky white, with red dots appearing at several spots on his face, located above his eyes where his eyebrows are supposed to be, below his left eyelid, ending above his nose, and finally a vertical one running the length of his right cheek. His hair is light pink and bears resemblance to spider legs.