Is kokone in the game? She's a vocaloid too...
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I focussed mostly on the more well-known ones I am familiar with. there's about 108 commercial vocaloid voice banks out. and that's not counting the voice synthesizers that don't refer to themselves as such.
I simply can't include them all as a solo dev, who does this as a hobby in her spare time. I do like Kokone's design though, so maybe I'll include her somewhere as a side-character!