Great genius. Coming up with productions, he creates various robots for shows, using his skills as an inventor. Because of his peculiar ideas, those around him treat him as an eccentric. Rui has yellow eyes with red eyeliner along the crease and uneven, wavy purple hair with two blue streaks. His right ear is pierced with a round blue earring, the other is covered with hair. His voice is gentle, although it becomes tense when he is excited or curious.