Momoha Odori, nicknamed Momo, hails from a wealthy family and attends Seioh Private High School. She maintains a quiet and reserved presence, frequently sleeping during class, which suggests laziness or disengagement. Despite this subdued exterior, she actively engages in school life through the journalism club and broadcast committee, constantly carrying a digital video recorder to document campus events. Her primary hobby is recording activities linked to the student council and its members, with particular focus on Manami Amamiya and their circle of friends.

Initially, Momoha keeps a distance from direct student council involvement, preferring observation and recording over active participation in meetings. Her role shifts as she joins the group assisting the council with projects like remodeling their room and planning the school festival. Though not an official member at first, her documentation proves valuable for their initiatives, and she gradually integrates more into their collaborative efforts.

Her development reveals a subtle transition from passive observer to engaged contributor. While generally remaining reserved and less talkative than her peers, her constant presence and behind-the-scenes work—especially videotaping events—signal a deepening commitment to the group's objectives. This becomes clear during student festival preparations, where her recordings capture the collective efforts of the student body. Her quiet dedication forms an unspoken pillar of the group's unity, particularly for archival or promotional needs.

Physically, Momoha possesses blue eyes and long blonde hair reaching her hips. Habitually sleeping in class and almost always using her video recorder are defining traits. She wears the standard Seioh school uniform. Within the PlayStation 2 visual novel *Kira Kira Happy Festa!*, she participates in summer festival missions; gameplay involves Manami giving her "Hustle Points" to encourage her during tasks, further defining her role in the group dynamic.