[Question] Site Guidelines and Modular Characters

So, as you know, Sonic Forces has the 'Avatar' character, which is a customisable character that the player can create.

I've figured out the skeletal structure of the models and everything, but I'm not sure how to package it.
Is there a particular way things have to be done as unlike traditional models, it's not one set of texture, one set of mesh; it's one skeleton, many meshes, many textures, multiple combinations for each body part.