Zero is part of a series of UTAUs called "Medialoids" which also include:
Kasumi Mamiko: <a href="http://utau.wikia.com/wiki/Kasumi_Mamiko
Honoka">http://utau.wikia.com/wiki/Kasumi_Mamiko
Honoka</a> Mamiko
Kiko Anzen: <a href="http://utau.wikia.com/wiki/Kiko_Anzen
And">http://utau.wikia.com/wiki/Kiko_Anzen
And</a> Enmu Rippa
English is Zero's native language, his voicebank is in Japanese because there are more Japanese Songs, but his Japanese pronunciation is a bit off.
Current Voicebank Download: https://www.mediafire.com/?3r3db38o7we12q6
Zero Also has a Gender Bend named Ito Koii, To get her voice use the flags g-18BRE50