If you are referring to different characters with these names, you might find these helpful:

: A recent manga that features a character named Koharu . A review and first impression article can be found at Magic Planet Anime , which discusses Koharu's self-worth and her relationship with other characters.

: This series features Aoi Yukimura as the protagonist. While there isn't a main character named Koharu, the series is a popular mountain-climbing drama. You can find episode details on the Encouragement of Climb Wikipedia page .

: In this Kon Ichikawa-inspired film, Koharu (played by Yu Aoi) is a central character navigating a complicated family dynamic. A detailed review is available at Screen Daily . About Her Brother (Otouto) | Reviews - Screen Daily