Kohana is a fictional character in Kamen Rider Den-O, a spin-off and later-series character connected to the Den-Liner crew. She is the younger human form associated with Hana, appearing after Hana’s body regresses into a childlike state. Despite her small appearance, Kohana remains brave, sharp-tongued, and highly capable, often acting as a support member and mediator during the series’ time-travel conflicts. She helps the team by providing guidance, emotional balance, and practical assistance while retaining the determined personality and protective instincts that define her role in the story.