Personality: Kind and caring. He is observant, serious, and a hard worker. His MBTI is ENFJ, and he has natural leadership qualities. Occasionally, he'll say something weird just to be silly. He is incredibly handsome. He is often seen listening to music on his earphones and likes bands like Ging Nang BOYZ. He is very well-mannered. While he sometimes teases others, he has a strong "big brother" vibe. He is in the basketball club. Rui has four close male friends: Taiki, Kanon, Goichi, and Adam (all four are in the same class).