He’s a vampire cat?
When did Harry ‘see’ Mavra? He used his Third Eye In Blood Rites but only caught the Hellhound.
it's how she's introduced in GP, he feels her presence and opens his third eye to see what it is
You had me up until...
Cats can walk across Circles without disrupting them. It isn't unreasonable to think all cats look the same under Site. The Age is an issue, so either he is a Changeling (or something worse) or Jim just doesn't have the heart to kill Mister.
I lean to it being Jim just not wanting to kill Mister, Bob would probably have noticed during a ride along if Mister was something more...
yes and no. The Mavra connection makes me think it has something to do with being... Transubstantiated? Blamps are inhuman creatures mirroring whom they used to be but, that mirror is precise and in parallel to life/unlife. They are born through the singular vessel... Kinda xenomorphic I suppose, taking on the character of the being they basically subsume.
Err. Rambling.. the second thing I'd draw attention to is Uriel. He had a purely human form under that jumbo jet. Without the Jet would he look exactly as he was?
I think Mister is either an "old guard" from when humanity worshipped cats themselves sans his jumbo jet, making him effectively just a cat. OR all cats are thus, divine beings who've been born into the world proper but never entirely left the aether either.. dual citizens? On technical level with fae queens and arch demons in that they would require the same sort of circle macfinn needed. A being of flesh AND spirit.
🤔 Though exactly why they wouldn't disrupt the circle.. can't wrangle if that means they have, or don't have free will, or something else more chaotic altogether.