

Avatar Extensions is a hybrid SDK Plugin x MelonLoader mod that allows you to customize your avatar's stats and masses, and preview the vanilla values, all from within the SDK! It also allows you to create new types of sound effects for reactions to things in the world. Now that's a fine sewer melon.
While similar, this is different than the Avatar Stats Loader mod. This mod allows avatars to include their custom stats with their released pallet, as a means of creative or mechanical expression on behalf of the avatar's creator. The creator chooses its stats so it plays and acts like they want it to, you download it and choose it, and it already has its custom values right out of the box.
The add-on package (for Unity) and mod are both available on the GitHub.
You need both their avatar and this mod (the mod is what tells the game to get rid of the vanilla ones and use these instead).
The mod will fail to load and/or crash if you do not have these installed. Install them.
About a day straight in IDA, reading raw assembly, and translating it by hand to C#. It was not easy.