Correct on all counts! Additionally:
Kaz, Jesper, and Nina are the most likely to be holding office draped across an armchair with a glass of wine dangling precariously from one hand
Nina and Jesper would love a chaise lounge to recline luxuriously in while being fed grapes like a Roman Emperor
Wylan is so used to making himself as small and unnoticeable as possible, but once he's comfortable around you, he does not know the meaning of personal space
Matthias voted most likely to get sat on/laid across by someone else
Wylan and Inej are always tense, no matter what. Their bodies are physically incapable of relaxing (no this isn't me projecting shut up). Kaz used to have this problem too but he's a control freak so he figured out a way to force his muscles to unclench (Rosa Diaz saying "my body is terrified of me")
Jesper is the ADHD bisexual of all time, so not only does he take up space, he does it in the weirdest ways possible and is constantly changing position
I'm picturing Jesper laying across a couch with his head in Nina's lap and his feet in Matthias' lap (which Matthias is Matthias about of course) and then when he can't be still like that anymore just rolling off
Nina would love a weighted blanket, so of course she loves when someone else just fully lays on top of her. This is usually Inej and occasionally Jesper
Inej and Wylan are most likely to volunteer for floor time if there aren't enough chairs, but if they've done that too many times Matthias will force them to take a chair while he takes the floor
Inej sits on the edges of tables or the arms of chairs/couches. She perches
Kaz got a footrest/ottoman/whatever to be able to put his leg up, but it's constantly being used as another seat. Sometimes the person sitting there will get a pillow tossed onto their lap and become the footrest
Nina will make a whole nest out of blankets and pillows wherever she is. If she can't completely disappear into it, it's not good enough
I imagine this can restrict her line of sight enough that it makes it even easier for Inej to sneak up on her. She'll look up from the book she's been absorbed in and get jumpscared by Inej sitting at her feet or dozing using Nina's side/the nest as a pillow, or staring at her from across the room like a cat
Wylan is also fidgety, but in a different way to Jesper. More localized/internalized (again with the "years of trying to not be noticed")