Riko is an outspoken and feisty young woman who appeared to steadfastly believe in her role as the Star Plasma Vessel. She tried to keep up an aggressive facade at times, but she's really just a normal teenage girl who's been thrust headlong into the jujutsu world. Riko is a social girl who cares about her personal relationships. She is very close to her caretaker Misato Kuroi and enjoys spending time with her friends at school as well.