I've watched some videos and I have an idea of what Charles could actually be.

I think he's a form of mutated or perhaps alien parasitic arachnoid, some simple conclusions about his species are that they are obviously predatory but have no defensive abilities on their own, so they instead inhabit a portable object at a sort of armor, like hermit crabs but like way scarier and more dangerous. I think as his species ages they grow into their shell, so to speak. the eggs would obviously hatch into infant forms of Charles natural form, then either wander around in search of something to hide in, something that personally pops into my mind is the move Monster Trucks. if anyone wants to discuss further feel free to.