Kitasan Black is based on the champion Japanese racehorse of the same name and appears as a cheerful horse girl in Uma Musume Pretty Derby, the anime and game franchise that reimagines racehorses as athletes. Her enthusiastic catchphrase, often romanised as harikitte ikou, roughly means going all out with spirit, and fans clipped the line for soundboards and edits. The sound spread through anime fandom spaces where short character shouts work as reactions, especially around races, training arcs and festival episodes featuring her upbeat personality.