What would a hairball from a skeletal cat look like
Hm! So obviously a skeletal cat does not have fur, a tongue, or a stomach, so it could not develop a hairball in the usual sense. (I'm now imagining other cats attempting to groom it for social reasons and getting their tongues stuck to the bone, though, a la licking fossils.)
But let's play in this space a little. Assuming the skeleton cat is not connected by tendons, which I rarely see in skeleton cat art, it is probably being held together by some sort of magical field. Let's say that field can get confused and accidentally start treating other nearby objects as part of the skeletal cat. Your cat jumped in a leaf pile? It's got leaves now. Your cat stole some food off your plate and it can't eat it but the food is now floating around as part of its body. Eventually the magic determines that these new items are not, in fact, cat-substance, and expels it. Notable examples include when someone's skeleton cat got into their marble collection and several hours later shot them in all directions like a ball bearing gun.
