>>273853147
MMD models are usually just one click in the CATS plugin to make them work in VRC. They come with entirely done textures that are easy to setup, a somewhat normal human and slim rig and you don't have to rip them with third party tools.

Koikatsu has an extremely buggy exporter to pmx (which is the formate most MMD models use). That destroys the textures in the process, often fucks up the rig and completely destroys all shapekeys. Doesn't take in account settings like iris size and more. So you also want to export all textures with ninjaripper which is a pain in the ass itself since they're .dds flipped upside down and you have a folder with 200 random names where you can search your shit together. And since koikatsu allows for user colours all of them are split in masks. So the purple cattail you have is actually not purple but grey and there's a mask you have to decompose to apply a color. And it's not even a proper texture, the details are in another image and have to be applied by eye to the original texture to even make it somewhat look alike.

So fare the best results I saw from Nabutso and Nynapi, you can ask them for help in the Discord if you joined.