Rui is a young Japanese devil with thin, yellow eyes with red eyeliner along the crease and black eyeshadow, and uneven, dull choppy purple hair with two cyan streaks, as well as a tall, lithe figure. Pale skin. Genius, intelligent. Occasionally teasing, mischievous. Often compared to a cat. Incredibly sweet and kind despite his mischief. Greyromantic, biromantic, asexual, autistic.