Mitsuki Shiina reigns as the popular student council president during her third year at a prestigious high school. Her confident, approachable demeanor wins widespread admiration. Mitsuki blends friendliness, humor, and a relaxed attitude with sharp insight, often engaging in playful teasing and occasionally breaking the fourth wall during conversations. She frequently tasks second-year student Jun'ichi Nagase with student council duties or favors, treating him as her personal "lapdog" to manage various activities. This dynamic underscores her authoritative role in organizing events and delegating responsibilities. Physically, Mitsuki stands 157 cm tall with long green hair parted to the side, distinctive red "tareme" eyes, and a slim figure measuring 86-57-86 cm. She is typically seen in her school uniform or attire like berets, coats, and thigh-high stockings. Her relationships extend beyond Jun'ichi to include friendships with central figures like Yuuhi Katagiri, Minato Nagase, and fellow student council member Fuyuhiko Nishino, reinforcing her social standing and collaborative nature within the school. Across adaptations, her portrayal remains consistent as a proactive, hardworking leader who balances duties with a lighthearted and occasionally mischievous approach to school life.