Yowane Haku is a popular fan-made derivative character in the Vocaloid fandom, derived from Hatsune Miku's voice configuration using the UTAU software. She features long white twintails, a red bow, and a black jacket. Unlike official Vocaloids, she lacks an official voicebank but gained fame through fan songs like 'OWATA☆WORST' by LamazeP. Her character embodies a pitiful, failure-prone persona with low self-esteem, often depicted as an alcoholic smoker who fails at everything. She contrasts with energetic derivatives like Akita Neru, representing a 'complex' existence in fan lore. Featured in series like 'The Melancholy of Detective Yowane Haku' and various PVs.