Generally, I'd just recommend to you and any other person reading this thread to stay away from creating voicebanks for already made characters. It could result in some trouble with the character's creator for one, but it can also be seen as many as cheap or trying to just follow off of that character's popularity. Especially with a fanloid like Neru, who already has an extremely popular method of using her voice. It would likely just stir up unneeded drama and result in disappointment. I would like to second Kierteiyu, not only because it'd be less of a headache or timebomb to make one of your own, but likely more fun anyways. Why try and make something to imitate something else, where you don't even have complete control over your creation due to some of it belonging to someone else entirely, when you could simply try to make something entirely original and uniquely your own?