I know this may sound like a ridiculous question, but indulge me. Have you tried talking with him, asking his name? House cats aren't normally native to this kind of environment and weirdly intelligent has me wondering if he wasn't brought here like the rest of us.

[ More to the point: ] A couple of us — Zam and myself — aren't human. [ Or in Zam's case, not normally stuck in a human form. ] Stands to reason there could be other sapient non-humans here, too.