"I'm certainly not a gashadokuro, mostly because I don't know who they are." Big grumpy skeletons, perhaps?

"I'm a monster! There are a lot of us, and we vary. Skeleton monsters such as myself are rather uncommon - woefully so, I dare say! If only there was a WORLD full of them!" Sans is the only other one he knows, after all. For a moments Papyrus gets lost in thoughts about more skeletons, wearing matching outfits to show that they're BROS, rattling their bones as they go about their business… what were they talking about again? Oh, right.

"But, I'd say my world mostly belongs to humans. Us monsters have been trapped underground for a long time."