@snufflesarmy mostly off the top of my head here are some (canon/official — I could make a post three times as long of my headcanons I’ve come up with based on his canon characterization) details about Jimmy in no particular order:
His driver’s license tells us that birthday is July 10, 1973, that he’s 5’11”, and that he weighs 170 pounds. His address is 325 Westview Drive. Also, he’s wearing the trench coat in his photo which I think is really funny.
He gets vessel DNA (or whatever makes a bloodline produce suitable vessels) from his father Gregory, and he comes from the line of Ishmael (this isn’t technically canon because it’s from a tie-in novel, but it is official)
Assuming that 10.20 Angel Heart takes place on its airdate making Claire’s 18th birthday April 29, 2015, Jimmy was almost 24 when she was born. — This assumption also means that The Rapture was set a day after Claire’s 12th birthday.
He speaks with what sounds like a slight Boston accent, definitely more noticeable than what Castiel usually has. Make of this what you will, but I like to think that’s where he’s originally from.
He introduces himself as Jimmy, and the only time he’s called anything else is in his driver’s license. He likely prefers ‘Jimmy’ over ‘Jim’ or his given name James.
He calls Claire ‘Bub,’ ‘Baby,’ and ‘Honey’ and Amelia ‘Ames.’
He tends to comb his hair flat, unlike Castiel. This obviously draws a distinction between the two, but with how differently Misha plays them I don’t even think it’s necessary.
He sometimes wears his wedding ring on his right hand. This is commonly seen in people from several different cultures from around the world — the most relevant regions that follow the tradition in this case are Austria, Hungary, Serbia, and Poland, all of whom have significant concentrations of the surname Novak — the name is also common in Czechia and Slovenia. (Edit: Rewatching the episode I think at least one of the shots where he wears it on his ‘right’ hand is meant to be him looking in a mirror.)
He wore dress shoes as part of the outfit he wore when Castiel possessed him. At some point, Castiel switched these out for boots.
We know he’s a devout man, but we don’t know what religious sect he is. I don’t even think we’re ever directly told he’s Christian, but I don’t know much about religion so I could be missing an obvious tell. His original counterpart in Jeremy Carver’s outline is explicitly meant to be Catholic.
He worked for an AM radio station as an ad salesman in 2008, which is probably meant to tell us that he’s been working a dead end job.
He was asleep in front of the TV which was tuned to a religious program when Castiel first reached out to him.
He does the inquisitive head tilt when demon Rodger is talking to him. Castiel may have picked it up from him or it could be a coincidence.
While under Castiel’s influence, his symptoms were apparently strong enough to get him prescribed pills (likely antipsychotics) which he refused to take. The fact that Amelia refers to the medication as ‘your pills’ could imply that he’s had an episode before.
He doesn’t listen to authority figures if he doesn’t want to, even if it makes his life harder. We can see this in him refusing to take his pills and in him leaving to go back to Pontiac despite Sam and Dean’s reasoning for why he shouldn’t.
Castiel either possessed him or simply manifested himself as him before the scene where he officially possessed him in The Rapture, since Dean’s handprint scar is Jimmy’s/Misha’s hand.
He waited in his shared Heaven for Amelia, meaning they’re soul mates. They hug after exchanging I love yous. They notably never kiss on screen — I personally don’t write Jimmy as gay, but is this anything? (It’s also reasonable to think that after six years they would want to ease back into it.)
He says Amelia is beautiful and strong and is happy when she says that Claire is too — How Claire was doing was his first question to Amelia.
Castiel regrets what he did to Jimmy’s family more than anything else he’s ever done.
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