cats-blender-plugin VS KITSUNETSUKI-Asset-Tools

You should use Cats Blender plugin in Blender. The recommended version is Blender 3.5, which you can find in their archives. And dev branch of cats, but I like this fork because keeps the bake tool. You can use Blender 2.8 (the version the latest official release of cats uses).

As for the stretchy-stretch, not sure. But if you use cats in Blender, you could probably automatically fix it. The latest version to use is Blender 3.5 with the Cats dev branch (just grab zip, add that). Though I prefer this fork for 3.5, because it keeps the bake functionality. Or Blender 2.80, if you prefer.

Hello, so you're having an issue. Please upgrade by first uninstalling the addon and installing this zip instead. It has a 90% chance of fixing your issue on blender 3.0+

You can download the development branch from github for CATS, it should work with 3.5

For Blender, CATS Blender Plugin helps a ton and makes a lot of actions easy. It is a little out of date, though, and only works with Blender 2.93.

Export the model as FBX via CATS tool, settings optimized for VRM models

Merge the two armatures with the Cats plugin. I recommend watching this video if you don't know how to do this and you can find the Cats plugin here

Art stuff: Gimp: https://www.gimp.org/ Modeling: VRoid Studio: https://vroid.com/en/studio Voice Changing: MorphVox Pro: https://screamingbee.com/morphvox-voice-changer Live2D: https://www.live2d.com/en/ (for if you'd like to animate and rig a 2D image. You can get some good results if you take the time to learn it, but the learning curve is a bit steep. That said, the video tutorials they post when you open the program are very thorough. Keep in mind the free trial is 42 days and it can be expensive to get after that point.) Model editing: Blender: https://www.blender.org/ (you'll want this plugin for it too, if helps with importing vrm files created by VRoid Studio and even has tools for fixing and rigging models: https://github.com/absolute-quantum/cats-blender-plugin) Unity: https://unity.com/download (you'll want the uniVRM plugin for this, found here: https://github.com/vrm-c/UniVRM) Motion Capture: Facerig: https://store.steampowered.com/app/274920/FaceRig/ (I used this back when I was using a live2D avatar) Animaze: https://www.animaze.us/ (I use this now that I'm using a VRoid avatar. I also think it's a superior product to facerig) 3tene (I'm trying it out this week, experimenting with it s bit: https://store.steampowered.com/app/871170/3tene/) Learning: so many YouTube videos. Seriously, I've learned so much. Lots of vtubers will tell you how they do stuff with their avatars, and there's a tonne of blender and unity tutorials out there. Whenever I want to do something I haven't learned how to do yet, I search for tutorial videos.

While it may not be the answer you're looking for since it sounds like you're hoping to not need external tools and to be able to do this all from within the game. However, you can import it into blender (with addons such as cats), and convert it to something like an FBX with all materials, bones, etc. intact.