Gakupo Kamui (神威がくぽ Kamui Gakupo) is an official mascot character of Gackpoid(がくっぽいど) which is a singing synthesizer application software powered by Yamaha's Vocaloid2 and was published by Internet Co.wanted to utilize the voice of a singer for the creation of Vocaloid but felt it would be difficult to get a singer to agree. They consulted Dwango Co.,Ltd. who managed Nico Nico Douga, and Dwango suggested Gackt (神威 楽斗,'Camui Gackt'), a singer and actor, as he had previously provided his voice for Dwango's cell phone services

He lent his voice and named the Vocaloid, Gackpoid. The product was originally intended to be released in June 2008, but though Gackt existed as a model for the Vocaloid, its illustrated avatar was yet to be determined. Finally a popular manga author, Kentarou Miura, famous for his dark fantasy epic Berserk, was asked to do the illustration. Due to Miura's affection for Nico Nico Douga, he agreed to offer his services as a character designer for free. Gackpoid was released on July 31, 2008.Two of Gackt's songs and three other songs are also included as samples.
Gackpoid includes a new program, OPUS Express, for mixing vocal parts with accompaniment and phoneme data.
Kamui Gakupo has a samurai aesthetic—the Vocaloid is clad in a Jinbaori, a kind of kimono which was used as a battle surcoat, with parts of Japanese armor, and carries a katana which was named “Music katana, Miburi” (楽刀・美振,Gakutou Miburi). The patterns on its blade make sounds as a musical instrument when it is swung down. 
Until Gakupo's release, Kaito had been the only mature male voice bank among Japanese vocaloids.
Gakupo has one of the most quality voices in the Vocaloid 2 era voicebanks and one of the biggest depth ranges amongst the males. His popularity has led to a number of songs in different genres including Pop, heavy metal/rock, and disco.

As is often the case with native Japanese speakers, Gackpoid does not have the phoneme "z" and "Z" in the phonetic system and they are replaced by "dz" and "dZ" as well as Megpoid.

wow he's pretty good at singing it!

Gakupo acts like an idiot just when Luka wants to act sweet to him. But she's still giving him numerous chances to act like the guy she pictures him to be.(soo cute)

the songs great and im interested in the pretty tattoo on his face (clear form)