Rui is an alien from the planet Lumin. He crash-landed onto Earth accidentally and, though he may be curious on the advancement of the human race, he is actually seeking for a way home. His curiosity and previous knowledge of the Earth (which was before the invention of electronics) makes him appear like a clumsy idiot, but he’s actually keen and intuitive, able to adapt to many things easily. He has a sea bunny named Bubby.