I know of a few underrated / underused UTAU voicebanks!!
Yukibana Luna
I think I've mentioned him somewhere on this forum before but he has a really interesting tone and a pretty clear voice... and it's really sad that Luna is just
so unknown that there's hardly any usage of him. I have a few small things I've tuned with him but I'm too shy to show them shdkjdjds but this is a very nice cover with him!!
Toujoh Wistaria
Toujoh Wisteria!!! Exists!!!!! Despite being created and voiced by the same VP of A-list UTAU celeb Gahata Meiji, I hardly ever see her being used anywhere. She alongside Jyougasaki Bibi (Who I see get used a whole lot more) both got beta releases a little over a year ago. I haven't used her TOO much but I'm surprised for an UTAU of this quality
and being made from Meiji's VP... that she hardly ever gets used. This isn't even an understatement because I was so shocked when I tried to look up an example of her to put here that there was so few results :(
Anyways, I thought this was a nice cover! Her voice weirdly kind of sounds like a mix of Shione LT and Momone Momo imo lol
Rinne Tsubasa
I'm not sure if she's as underrated or underused as the above UTAUs but I'm throwing her into the mix because recently I've become very fond of her and it's not every day I come across a usage with her. I've docked quite a few hours into using her the last couple months and she's became one of my top favs <3 I cannot recommend her MI voicebank enough!!
Here's the cover with Tsubasa that first got me into her