Miki Tokura is a supporting character in the series Slow Start. She is a middle school third-year student and the younger sister of Eiko Tokura. Miki bears a near-identical appearance to her older sister, but their personalities are quite distinct. Where Eiko is outgoing and lively, Miki is calm, reserved, and speaks with polite, measured language. Her quiet demeanor can lead to misunderstandings; for instance, one of Eiko's friends, Kamuri Sengoku, initially mistook Miki for Eiko, which set off a chain of events that ultimately led Kamuri to enroll at Hoshio Private Academy.

Miki's role in the story is primarily as a minor figure tied to Eiko's family life. She appears in scenes that involve Eiko's background, such as when a photograph from Eiko's middle school days reveals the resemblance between the sisters. Later in the manga, Miki develops a personal interest in Hiroe Hannen, a young woman she meets in a park. She begins following and observing Hiroe while both are out jogging, an activity that unnerves Hiroe and adds a layer of comedic tension. This pursuit suggests a budding curiosity or crush, but the narrative does not explore it in depth.

There is no extensive development arc for Miki; her character remains a gentle foil to her sister and a source of occasional confusion due to their twin-like looks. She does not possess any notable supernatural or special abilities. Her main function is to highlight Eiko's family dynamic and to provide a catalyst for a side plot involving Hiroe. Overall, Miki Tokura is a low-key, soft-spoken character whose reserved nature and close resemblance to Eiko define her presence in the series.