Kaoru Hitachiin is a fictional character from the anime and manga series Ouran High School Host Club. He is one of the twin brothers, alongside Hikaru Hitachiin, and they are known for their mischievous personalities and close bond. Kaoru has a playful demeanor and often enjoys teasing others, especially his brother. In the series, Kaoru and Hikaru run a host club where they entertain female clients. Their unique appeal lies in their identical appearance and the way they play off each other's personalities. As the story progresses, Kaoru begins to develop his own identity, distinguishing himself from Hikaru.