Rui was a boy of short stature and a small physical build. His skin was 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 was light pink and bore resemblance to spider.Holding the position of Lower Rank Five, Rui had the kanji of "Lower" and "Five" engraved into his left eye, signifying his ranking.