Marin Ogura is a supporting character in Age 12, where she appears as a sixth-grade student and a close friend of Hanabi Ayase and Yui Aoi. She has orange hair that is usually tied into a bun, fair skin, and brown eyes. Marin is depicted as bold, direct, and more outspoken than her two best friends. She often takes on the role of a love advisor within the trio, drawing on the experiences and knowledge she gathers from her older sister to give Hanabi and Yui advice about boys and romantic situations. Her motivation seems to stem from a genuine care for her friends and a desire to help them navigate the complexities of early adolescence, even though she herself does not have a boyfriend and tends to view boys her own age as immature. As a member of the three-girl clique, Marin shares a strong bond with Hanabi and Yui, and her confident, precocious personality complements their more reserved natures. While the narrative focuses more on her friends’ personal romantic developments, Marin’s role is that of a supportive and knowledgeable confidante who influences the group’s dynamics. She does not undergo major personal growth in the story, but her consistent presence reinforces the theme of friendship and the value of having a trusted peer to turn to. Her notable ability is her skill in offering practical, sisterly advice, which she delivers with a straightforward and sometimes teasing attitude.