Talk:KAITO/@comment-72.223.81.242-20130209025509/@comment-53539-20130209203825

The vocaloid 3 engine is localized to all 5 languages its currently made for, you select the language upon installation. Though only 1 of the 4 will be English phonetics, the engine itself will be in English if you have V3 installed with English by default.

Gumi English has a trial right now (see her wiki page or Vocaloid Otaku forums and a few other places for details) so to get an idea of what its going to be like you could try that out. Kaito's likely to be default Japanese since English isn't supported. Since Gumi English will be English supported since its sold on the vocaloid shop, Kaito's English will be a little disadvantaged against Gumi. :-/