Name: Yowane Haku (弱音ハク)
Release: November 21, 2007
Creator: CAFFEIN (カフェイン)
Character Item: Wine Bottle
Haku was originally made as a representation of songs that use Hatsune Miku but ended up sounding awful. She became popular and her creator Caffein later established other characters following the same procedures, each representing a slightly different aspect of failure within the Vocaloids.
Haku is one of the Vocaloid derivatives that became officially recognized by Crypton Future Media, the publisher of the Character Vocal Series for Vocaloid 2. The other derivatives bearing this distinction is Miku Hachune, Neru Akita, Meiko Sakine, and Tako Luka.
Haku 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.