So I've been creating some artwork for a while now and I wanted to try cell shading my rig as I'm always wanting to try different lighting styles. A problem I realized though is I believe Blender doesn't recognize this rig as an object. If I make a simple cell shader in Eevee and turn on rendering, it affects anything else (cube, UV sphere) but my rig remains unphased. Moreover I can't use nodes on it; Blender won't let me. Maybe it's because this is a pre made rig I got from someone else but this is really grinding my gears. Is there anyway I can resolve this?
Here's the link to the rig(s) by the way, it's an add-on. Maybe someone can play around with this and help me out: https://softgb.gumroad.com/l/robloxstarterrigs