Considering Brig is almost 6ft tall herself, Mitzi is an absolute unit. Perhaps some kind of Norwegian Forest, or a chonky Persian? These seem like a couple of the few breeds that could reliably carry and operate a jetpack.
I’d probably go with a Norwegian forest as well, the larg size is probably a combination of radiation from the omnium in Australia (If it did that to Australia it definitely affects the rest of the world in some way, similar to Chernobyl) and the cat being quite old and happy, as brig was shown to have the same cat when she was younger.
At any rate the cat is a mega chonker and I want one
True. If you Blizzard-ify it, that looks fairly close. If you get a profile shot of Mitzi, you can tell which it is, because MC’s have ‘broken’ noses, while Forest Cats have straight nose bridges.