Typically there will be a conceptual “mesh”, that is actually comprised of multiple “SubMeshes”. When you export a cube with a different material on each face, Unity will import that as a Mesh with one SubMesh for each face, and each SubMesh will only have a single material. 

@frob Thank you very much for your reply, we'll dwell on your suggestions now. Also it's not really a moba style game but the only similarity being it will have characters with abilities is all.

I have no experience in Unity nor other dev software, I use Maya for 3D Modelling and Animation. I know to rigging too