Rui's personality lives by its own rules, causing people to consider him a weirdo. He is almost always smiling and has a strange sense of humor that often leads others to misunderstand him. Rui has yellow eyes with red eyeliner along the crease, and jagged, wavy purple hair with two blue streaks. A round blue earring is pierced in his right ear, the other is covered by hair. His voice is gentle, although he becomes tense when he is excited or curious.