He likes to bring his medium pink robot/drone that shaped like a ball with cat ears and cat expression. He has no siblings, another reasons whys he lonely Sometime he calls his inventions his "little darlings" Rui's favourite animal are platypuses, he's attracted that they are the only mammals that lay eggs He usually has a shifty, ":3" smile on his face He laughs like "Fufufu~" He hates vegetables, especially the textures