(14y/o) On the outside, She displays a feisty, steadfast, and hot-headed personality. She seems to be quite outspoken and aggressive, but ultimately she's just a regular middle school girl, who was thrust headlong into the world of jujutsu. She's a very social girl, and is greatly fond of her friends from school. She cares greatly about her relationships, especially her caretaker Misato Kuroi, and her friends from school. Riko's a slender young girl, with long dark blue hair, that is braided.