Mika Inamori, nicknamed Mikan, serves as a central character in her anime series. Portrayed as shy and clumsy, she frequently trips or bumps into objects due to nervousness and physical awkwardness. An only child, her parents' spoiling fostered initial dependence and low confidence in handling responsibilities alone.

Prior to new students arriving, she was Seioh Private High School's sole student council member as secretary. This isolation left her overwhelmed by organizational duties, causing the council room to become cluttered and storage-like. Her circumstances shifted when Manami Amamiya transferred in as student council president.

Initially uncertain about Manami's energetic, unconventional methods to revitalize school life, Mika hesitated in collaborating under such enthusiastic leadership. Despite this apprehension, she formed a strong attachment to Manami, often hugging her from behind. Manami's influence gradually inspired Mika to engage proactively, embracing council reforms and growing enthusiastic about planning events like the student festival.

Her personal growth involved overcoming passivity and finding joy in contributing to council goals, though she remained the least mature among peers. She maintained childlike beliefs, such as crediting overnight work completion to "little people." Academically and athletically average, she showed minimal sports interest and struggled with activities like swimming. Her daily routine prioritized horoscope checks, even at risk of school tardiness.

She possesses dark blue hair, brown eyes, and stands 1.45 meters tall. Her birthdate is December 24.