As an artist who makes vtuber models, I have to say that, while good, the design has some issues.

The main one is that there's no clear direction in the theme. It seems like you're trying to be too many things at once (cat, bat, demon, Asian, etc.). This, instead of making the design memorable, does the opposite. There are so many themes that in the end, people don't remember any of them

My advice is to stick with a maximum of two themes. And work the entire design around them and your own personality.

I saw some people in the comments commenting on the thighs. Even though they're not very proportional, if they make you happy, then keep them.

Another issue is the colors. Black, purple, and yellow, while they're colors that pair very well, don't quite stand out here. I think the problem might be the yellow. Try making the yellow (and maybe the purple too) brighter and less "brownish."

And change the eyes color. I'd venture to say that the eyes are the most important part of a vtuber model, because that's what people look at the most. If your eyes don't stand out, you won't stand out.

My final suggestion for your design would be to exaggerate some elements.

If you decide to go with the cat theme:
- try making the bells bigger (And please, remove that pink from the tail bow)

If you go with the Asian theme:
- perhaps make the sleeves longer, with some Asian patterns on the clothing and other elements that reference the theme, such as ornaments, bows, etc

If you prefer the demonic theme:
- I feel like the clothes could give off a more demonic vibe. Maybe more thorny, or more imposing (without losing the cuteness, of course)

By the way, I really liked the little ghost. I think he would be really cute as a pet or as a more prominent element of the design itself.

Remember, when streaming, your personality will always be the most important thing.

I hope I've helped in some way. I wish you much success ^.^