"Kōsaka Aki" is a character from the light novel series "Ore no Imōto ga Konna ni Kawaii Wake ga Nai," written by Tsukasa Fushimi. She is depicted as a high school student with a passion for anime and video games, often showcasing her otaku lifestyle. Aki is known for her strong personality and complex relationship with her brother, Kyousuke Kōsaka. The series explores themes of sibling dynamics, otaku culture, and the challenges of adolescence. Aki's character development is central to the story, as she navigates her interests and personal growth while dealing with societal expectations and family relationships.