@natalie @KawaneRio I was experimenting yesterday and I got an exporter that could export both to .obj and .pmx (I presume that's MMD format).

However, the exporter has a lot of issues. I didn't try the pmx but the obj has the hair missaligned and has some missing textures, everything is exported as a single mesh (so you have to take your time to separate all the pieces) and also the model is not rigged. I'm not sure if the pmx has rigging because, as I said, I didn't try it (I don't have MMD installed right now).

The good news is that, with a lot of work, it can definitely be fixed and get it ready for VRChat or whatever you plan to use it with.