(From Vocaloid Wiki):

 

Yowane Haku (弱音ハク) is an officially recognized derivative. The term "Derivative" is used here to describe a fanmade Vocaloid character that is based on an already existing character.

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History

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Haku was originally made as a representation of songs that use Hatsune Miku but ended up sounding awful. In such cases, the makers of that music would then proceed to whine about how their work never received attention and later moved on to whine when criticism stated their work as dull and boring, or was posted quite late when few people were on Nico Nico Douga. She became popular and her creator Caffein later established other characters following the same procedures, each representing a different aspect of failure within the Vocaloids.

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Etymology

Her name is taken from Yowane, meaning negative sayings/thoughts and Haku, roughly translated as utter. Her first name and last name make a play on words "yowane-(wo)-haku" (弱音(を)吐く), meaning to say negative thoughts or to show white feather. Her white hair is from ハク, which has the same pronunciation with 白 (white).

She is referred to as a "VOYAKILOID" (in Japanese, ぼやく) - 'Boyaku' means grouchy or to grumble and complain, the pronunciation in Japanese is Boyakiroido.

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