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Yowane Haku is officially recognized as a derivitive character, but does not have an individual voice of her own. She was originally a representation of awful sounding Hatsune Miku songs, but has taken her own place among the other vocaloids. There is no set preference of sound for Haku, as it is up to the producer's ideal, but in general her voice tends to be lower and have a more depressed sound.
Contributed by Tiffany Garcia