Riko is an outspoken and aggressive young woman who seems to firmly believe in her role as a Star Plasma Vessel. She has tried to maintain an aggressive facade at times, but in reality she is just a normal teenager who was Theron headlong into the world of jujutsu. Riko is a sociable girl who cares about her personal relationships. She is very close to her caretaker, Misato Kuroi, and also enjoys spending time with her friends at school.