Kyousuke Kōsaka is a fictional character from the visual novel and anime series Ore no Imōto ga Konna ni Kawaii Wake ga Nai, also known as Oreimo. He is the older brother of Kirino Kōsaka, a high school girl who is passionate about anime and video games. Kyousuke is depicted as a supportive sibling who often helps Kirino navigate her interests and challenges. In the series, Kyousuke is characterized by his pragmatic and sometimes sarcastic personality. He initially struggles with his sister's hobbies but gradually becomes more involved in her world. His character development highlights themes of family, acceptance, and the complexities of sibling relationships.