I know that Episode.0 was originally sung by Gakupo and then covered by Gackt
Does it count if the song was originally sung by the voice provider and then covered with the Vocaloid? There's a lot more of those.These VOCALOID3 voicebanks have went on to be updated for the VOCALOID4 Engine. Three updated VOCALOID3 voicebanks have since been developed for him. The first voicebank produced by INTERNET Co., Gakupo was also the first Vocaloid to be voiced by a major Japanese singer. Kamui Gakupo, Gackpoid, がくっぽいど, Camui Gackpo.
The mascot of the software is called Camui Gackpo (神威 がくぽ, Kamui Gakupo), after Gackt's alias name Camui Gackpo Vocal Synthesizer Wiki Fando
His voice is sampled from Japanese singer and actor Gackt. There have been additional installments developed for the VOCALOID3 engine in July 2012 and for the VOCALOID4 engine in April 2015 Gackpoid (がくっぽいど, Gakuppoido), is a software product developed by Internet Co., Ltd. as Gackpoid (がくっぽいど Gakuppoido), which was initially released in July 2008 for the VOCALOID2 engine. がくぽ Kamui Gakupo), is a Japanese VOCALOID developed and distributed by Internet Co., Ltd. Release date: JGender: Male Optimum tempo: 60BPM - 150BPM Optimum range: A1 - C4 Latest Version: Vocaloid 4 Character Item: Eggplant, fan, his sword. Home Gakupo voice provider Gackpo Camui (Gackpoid, Gakupo Kamui) FC VocaVerse Networīasic Information Software: Gackpoid Character Name: Gakupo Kamui / Gackpo Camui Voice Provider: GACKT Developer: Internet Co.