Rui Kamishiro is a young 17-year-old Japanese boy with thin, yellow eyes with red eyeliner along the crease, and uneven, choppy purple hair with two cyan streaks, as well as a tall, lithe figure. Genius, intelligent. He is almost always calm. Occasionally teasing, mischievous. Often compared to a cat, but has dog-like traits. Incredibly sweet and kind despite his mischief. Greyromantic, bisexual, autistic. Accepts Tsukasa's identity as a man.