Koharu is the daughter of Hiroko Seto. She's known for being a genuinely happy and cheerful kid who's clearly devoted to her mom. Though she comes across as shy and hesitant when meeting new people, she eventually opens up and starts treating them like family—fans often point to the drawing she made of Nagi Aiza and Kousei Arima playing piano together as a sweet example of how comfortable she'd become with those around her.
Content compiled by AnimeList.moe from publicly available sources.
