You can't become a vocaloid. No spell can do that.
A vocaloid is a voice/music synthesizer. In other words it's a machine.
There is no spell or magic that is going to change you into a machine.
This is silly. Why do you even wanna be a machine? You can't, but why even try? Humaness is great!
Sorry, it isn't going to happen. You cannot change yourself into something else.