Mikoto Suou is a student at Yagami High School and a close friend of Tenma Tsukamoto, Eri Sawachika, and Akira Takano. She is widely regarded as one of the strongest and most attractive girls in the school, known for her tall, well-developed build and tomboyish yet feminine demeanor. From childhood, Mikoto has been both academically gifted and physically capable, training in the martial art of kenpo at the dojo run by the father of her childhood friend, Haruki Hanai, and eventually earning a black belt. Her outgoing, kind, and reliable nature makes her very popular among her classmates, and she often acts as a dependable support for her friends, offering warmth and encouragement.

Despite her generally cheerful and bright personality, Mikoto has a quick temper when provoked, and she does not hesitate to physically confront anyone who behaves inappropriately, a situation that arises frequently due to her notably large bust. She is diligent and charismatic, though she also possesses a competitive streak that emerges in both athletic and everyday challenges. Her initial romantic interest is an older male tutor from her middle school days, but she gives up on him after learning he has entered a relationship. Later in the series, she begins dating her classmate Hiroyoshi Asou; however, he eventually breaks up with her because she outperforms him in traditionally masculine activities such as video games, a breakup that highlights her independence and capability. Throughout the story, Mikoto grapples with her own relationship issues, even as she willingly helps her friends navigate their own complicated romantic entanglements. Underlying her interactions with Haruki Hanai is a mutual, often unspoken affection that slowly develops over the course of the series.

Mikoto role in the series is that of a supportive friend and a secondary romantic lead. She is frequently seen sparring with Hanai, and her martial arts skills make her a formidable presence in comedic and action-oriented scenes. Her character experiences growth as she learns to confront her own feelings and navigate the complexities of high school romance, moving from a crush on an unavailable senior to a more mature awareness of her connection with Hanai. Her notable abilities include exceptional physical strength, kenpo expertise, and a natural athleticism that, combined with her intelligence and social grace, establish her as one of the school most admired and capable students.