Haku was originally made as a representation of songs that use Hatsune Miku but ended up sounding awful.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.
Some fans have tried to give her an actual voice using Miku's voice and manipulating it to sound depressed, through methods like down pitching her. These were later also switched to the Miku Appends as some such as Miku Append Dark produced the desired results much easier or a manipulation of MEIKO's voicebank.
It has been pointed out by some fans, when speaking about songs and PVs that feature Haku singing, say that if one succeeds at producing a "bad" song, then no failure was met in the process. There are a small number of fans who disapprove of such songs, this is because it can be considered a contradiction to the point of Haku's existence being based on failure. This in particular is also aimed at the Haku songs that end up sounding "good" as Haku was meant to be far from this ideal. However, whatever songs that come out in her name are subject to the interpretation of the producer, whether they follow Haku's depiction of failure or not.
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.
Haku's design is drastically different from Hatsune Miku. She has white hair as her name suggest, though popularized as grey, it is as long as her body and styled into a ponytail held by a bow that is striped black and purple. She has a stray hair at the top of her head, nose length bangs, and payot. Her eyes tend to slope downward and there is a hint of under-eye circles. On her left upper arm are painted red letters, "DTM", that stands for 'Desktop Music', which is what Vocaloids were created for.
Her top is grey in color and sleeveless, the style is midriff with low cleavage covered by a purple tie. The rest of her attire is black with purple trim. She wears detached sleeves, and bell bottom pants with short white boots. On her left side is a belt strap. Her headset microphone points upward away from her mouth. Going by Caffein's character sheet commentary, Haku's early design had a tinge of grey skin, but it was not well received. Her red eyes were not an attempt to reflect albinism, but merely inspired while watching a Ghost in the Shell: S.A.C. music video on Nico Nico Douga, the character named Major has red eyes.
- Hatsune Miku: Source of inspiration
Music featuring Yowane Haku
Haku is one of the derivatives of Vocaloids that became officially recognized by Crypton Future Media, the publisher of the Character Vocal Series for Vocaloid2. The other derivatives bearing this distinction is Miku Hachune, Neru Akita, Meiko Sakine, and Tako Luka.
Because of her popularity, merchandise of Haku appear alongside official VOCALOIDs.
Official licensed Haku figurines have been produced: a Nendoroid Puchi, a scale model and a plush.
In メーカー非公式 初音みっくす (Maker Hikōshiki Hatsune Mix), Haku makes a cameo appearance as a student of Akita Neru (who is a teacher), and again drinking sake with MEIKO. She appears in chapters 2, 3, and chapter 16.
In the rhythm game, Hatsune Miku -Project DIVA- (series), Haku is an available character. If the player has not chosen her for a long time, she exhibits her trademark moody mannerisms.
In Project Mirai, unlike the Diva series, Haku does not appear as a playable character. She does, however, appear in the game's video of Aku No Meshitsukai.
- While she was conceptualized to originally be a Miku user, Caffein states it is not a problem to think of her as a failing Vocaloid, or a co-worker, or the lady at the small candy shop etcetera.