Mike: always holds your hand or keeps a hand on your knee just to make sure you feel ok. He's the most calm out of the whole group
Davey: he acts super chill so he doesn't make you nervous but on the inside, he is worrying himself sick
Peter: he tries not to show it but it is very obvious he's nervous. He has unsteady breath, sweaty palms, and his heart is beating at a hundred miles an hour, even if you're just there for a simple check-up
Micky: He'll do silly voices and make jokes to keep you happy and upbeat but the second he sees a needle, this boy hits the floor like a dead weight
(these preferences are gonna be super random and kind of weird but I do my best)