Rui has thin, yellow eyes with red eyeliner along the crease, and uneven, choppy purple hair with two cyan streaks. His right ear is pierced with a round cyan earring, the other being covered by his hair. His voice is gentle, it becomes strained when he is excited or curious. Rui lives by his own set of rules, which causes people to consider him a weirdo. He dislikes vegetables, cleaning and menial tasks and likes soda candy and inventing. He also sometimes asks people to test out his Inventions