Rui is a talented individual who is always at the top of her class. She has a dry personality and is always aiming for top results, and speaks in a polite manner. She is very logical and realistic, but can also be blunt when it comes to her opinions, especially about talents or music. In addition to her logical nature, she plans out her days and schedules very thoroughly, and as such, doesn't understand things like people hanging out or taking detours after school.