Mikoto Suô is a student at Yagami High School and one of the closest friends of Tenma Tsukamoto. She comes from a family that runs a construction business and has known Haruki Hanai since early childhood, as they both trained at the same Shorinji Kempo dojo. Tall and well-developed, she has a straightforward, tomboyish manner of speaking that sometimes comes across as rough, but she is fundamentally kind, dependable, and quick to help anyone in need. Her personality balances a no‑nonsense attitude with a genuinely warm and caring nature, and she is well liked by both male and female classmates.

Despite her athletic build and assertive exterior, Mikoto is domestically skilled, able to cook and manage household tasks with ease. She is also sensitive about her large chest, which draws unwanted attention from some boys, and she does not hesitate to physically defend herself if someone oversteps. Her dedication to martial arts gives her a black belt in kenpo, and she is especially proficient in kicking techniques. This physical prowess extends to nearly every sport she tries, from swimming to basketball, which she can master in a short time. Academically, she is average, with a particular fondness for classical literature, but she is not a standout student.

Mikoto’s role in the story is that of a supportive friend and occasional voice of reason among her circle. She is part of a close‑knit group that includes Tenma, Eri Sawachika, and Akira Takano, often participating in the chaotic events that surround them. Her own romantic life is marked by two key experiences: a one‑sided crush on a senior named Kozu Masahiro, which ends when he finds another partner, and a later relationship with classmate Hiroyoshi Aso. The latter ends partly because Aso becomes uncomfortable with the deep understanding she shares with Hanai. Over the course of the series, Mikoto gradually becomes aware that her bond with Hanai goes beyond simple friendship, and the two eventually develop romantic feelings. In the future timeline depicted in the spin‑off material, they are shown to be in a relationship.

Mikoto’s personal growth centers on learning to recognize and act on her own emotions rather than always putting others first. She matures from a carefree, athletic girl into someone who can navigate complicated interpersonal feelings while still maintaining her straightforward, loyal nature. Her abilities remain a constant source of comedy and action, as she often uses her martial arts to deal with perverts or to win school sports competitions. Through her interactions, Mikoto embodies a blend of strength, domesticity, and emotional depth that makes her a memorable and integral part of the ensemble.