Vocaloid Wiki

Otori Kohaku AKAZA VOCALOID4 | Songs Albums Notable Originals

Otori Kohaku (大鳥こはく), also known as Unity-chan (ユニティちゃん), is a Japanese VOCALOID that was released for "Unity with VOCALOID", which is distributed by Unity Technologies Japan and uses the VOCALOID2 engine. She was released for the VOCALOID4 engine in January 2016, developed and distributed by the YAMAHA corporation.

She is voiced by a Japanese amateur voice actress, Asuka Kakumoto (角元明日香 Kakumoto Asuka).


Kohaku was born on August 13 and her bloodtype is AO.

According to the biography on the character's website, Kohaku is the only daughter of Otori Yuuji, the CEO of a company called Otori Orchestra. She dreams to be in action video games and movies. Her favorite food is curry croquette.[1]

VOCALOID itself resulted in the growth of Kohaku's character. Despite being the voice actress of Kohaku for a while, Asuka Kakumoto had no experience in anything other than speaking roles. The development of the VOCALOID vocal lead to her first "singing" role and the singing voice of Kohaku had to be experimented with for the first time. This pushed Kakumoto's voice further than it had ever gone before.

The "Unity-chan" voice was used in the song "HALFALOGUE" to fill the role of AKAZA, a second character for the voice.[2] The presence of both Kohaku and AKAZA was meant to be a note of the overlap of the vocals between the Asuka Kakumoto and the VOCALOID despite being the same vocal.


She originally appeared with the outfit used for "Candy Rock Star", a 3D "live performance" using Unity technology. In the "Candy Rock Star" video, she performed "UNITE IN THE SKY!", a song featuring her voice provider singing as Kohaku.

Her original debut outfit consisted of a blue long-sleeved shirt with a brown and orange vest over it. The vest had orange checkers on the side with the word "Unity" under them. She also had orange striped thigh high socks and black shoes. Her hair was split into a type of twin tail style.

Her VOCALOID design was a twist on her original debut outfit but with major changes.

In all of her designs, she wears her signature black headband with long orange ribbons attached.


For more on VOCALOID relationships, see the FAQ.

  • AKAZA - A VOCALOID voiced by Asuka Kakumoto.
  • Otori Yuuji - Father.
  • Kanbayashi Yuko - Schoolmate.
  • Fujiwara Misaki - Schoolmate.



For the Japanese version of the Unity engine, Kohaku's assets were downloadable for free. This proved a popular move with developers using the product.

Her license was set to be modified in line with her VOCALOID release. Both the VOCALOID for Unity SDK and voice library can be used in projects for free when sales in the previous year were 10 million yen or less. Regarding other usage of the VOCALOID voicebank, an engine fee will have to be paid according to your profit margin. This is due to the Yamaha royal system, and users wound need to seek consultation with 3rd parties for use with VOCALOID and other companies' vocals (example Crypton Future Media, Inc. and Hatsune Miku).[3]


Otori Kohaku
The Unity-chan vocal is meant to represent the singing vocals of "unity-Chan". It is voice acted and intended to sound vivid yet be high of quality. It prefers faster songs over slower.
Misc versions
A "lite" VOCALOID2 version exists for Unity with VOCALOID.

Music featuring Otori Kohaku[]

  • On this wiki, Otori Kohaku is featured in 8 songs , 1 albums .
YouTube logo
Translation SILENCE
Otori Kohaku
Categories Cover song, Japanese cover
YouTube logo
Translation 過食性:アイドル症候群 (Kashokusei: Idol Shoukougun)
Otori Kohaku, Rana V4
JorroTreul (tuning, mixing, mastering), Lucifer (VSQx)
Categories Cover song
Niconico logo
Otori Kohaku
Freeze (music, lyrics), テラバイト☆ゆういち (video)
Categories Original song
閉ざした目の 奥に描く夢は
Niconico logo
Translation Tozashita Me no Oku ni Egaku Yume wa
Otori Kohaku
Categories Cover song; Self-cover
Search for music featuring Otori Kohaku [show/hide]



Google Trends


  • First VOCALOID for Unity with VOCALOID


External links[]

Language Description Site
Japanese UNITY-CHAN! Official website for Unity-chan Link
Japanese unity-chan!@夏休みなう @UnityChan_PR The official Twitter account for VOCALOID UnityChan. Link
English deviantArt , art and media community Link
Japanese Pixiv , art and media community Link