Koharu Seto is a supporting character in the anime Baby Love. She is the younger sister of Shuhei Seto. She is a sixth grader who shares a classroom and a room with Seara Arisugawa. Initially, Koharu dislikes Seara, but her feelings change when Seara helps her pursue a relationship with Wataru Nikaidou, a boy Koharu likes. Koharu is described as stubborn, easily embarrassed, and somewhat of a tomboy. She is not very tall or athletic, with short brown hair and brown eyes. Her relationship with Seara develops from initial animosity to friendship, largely because of Seara's assistance in her romantic life. Koharu's own romantic subplot with Wataru is a secondary focus in the story, and she eventually gets together with him thanks to Seara's encouragement. She does not possess any special abilities or powers; her role is primarily as a supportive friend and sibling within the domestic setting of the series.