She is a practitioner of a particular style of martial arts known as "Extreme Rules". However, because she doesn't adhere to the more traditional martial arts such as Karate, she is spurned by the mainstream martial artists. She is still a very determined girl. She idolizes Ayaka Kurusugawa since the latter also happens to practice the same "Extreme Rules" form of martial arts. She possibly likes Hiroyuki as shown during her conversation with Yoshikata, as the latter described Kotone as "Aoi's rival for that guy", which she replies "I guess you could say it that way".