This plugin allows for players with their own models, to sync those models to the server, which then lets other players see your specific model. This lets each player have their own unique model without having to manually set up each player in your resource pack.

Client mod: https://www.curseforge.com/minecraft/mc-mods/obj-fbx-loader

NOTE

YOU MUST HAVE THE CLIENT MOD TO USE THIS

This currently only works with FBX, as OBJ animations are a heavy load and inconvienient. I may add OBJ support later but as a toggleable option due to its inconvenience.

Also using high-poly models will probably cause a lot of lag depending on your setup

WARNING

This mod does not have any built in moderation or limits, so refrain from using this for public servers for now. Anyone can import any model of any size, so to refrain from lag and unwanted models, do not put this in public servers until I add moderation features

Model Credits: 

Wigi: Sketchfab

Dinosaur: Sketchfab