Zaion is more naturally expressive than the majority of other NijiHolo vtubers I've seen without having a 3.0, so basically just get whoever rigged her to do more work. This is kinda a crappy image I stole from 4chan but it shows a bit of how she can show a range of expressions without having any toggles.
Here's a gif that shows off what you're talking about pretty well:
View attachment 9704
Not only is her model very expressive, but she does a great job taking full advantage of it.
Just watched some of her VODSThe best example I ever remember of Zaion (I hadn't got a chance to check her content, being a meloco simp that I am) expression is when Meloco accidentally called Hex "Sexy" during the wave debut, as shown in this clip
Zaion was like wide eyed surprised and it's so amazing to see.
>Super expressive facial expressions
>Mouth movement like a fucking muppet
Mucho texto! Setting himself up to be the autist of the gen
I'm going to assume you know nothing about the Yoshikage Kira copypasta
Uh oh! Am I the retard?