Well if no actual SJ's want to contribute, here's what I said about my SJ friend:
I have a friend who's a very nontraditional ISTJ. She didn't have a happy childhood, and I think basically around 13-14 she figured out that the values her parents were handing down to her weren't right, so she replaced them with another set of values which she will never waver from. She is now very set in her ways, having the beliefs of a liberal but the tenacity in believing them of an ultra-conservative.
And here's some elaboration:
She's very pro-responsible-drug-use, and wants everything to be legalized, and thinks driving while high is a terrible thing to do, because it's detrimental to "the cause."
She's got a book shelf full of Voltaire, Camus, Nietzsche, and also contemporary guys like Chuck Palahniuk. So, obviously, not averse to theoretical things. The thing is, I
never see her reading them. I'm sure she's read them many times so I don't hold it against her, but it must be sentimentality that makes her keep those books around, since she's not doing it for ease of reference. I never see her buy new books, either. Not a voracious seeker of new ideas. She has Voltaire as her computer desktop
and a framed picture of him on the wall. She's also obsessed with the Joker from Batman, "because he's an existential absurdist."
She likes things that would offend your grandmother, like It's Always Sunny in Philadelphia and the aforementioned Chuck Palahniuk, but Cannibal Holocaust was too much (she's been a vegetarian since age 7 or something).
She's in film school, but only really likes writing movies and hates being in charge of any group production project. When another friend had big project, this girl
wanted to be in charge of keeping everyone fed and keeping the house they were all staying in clean; she didn't want any other responsibilities. She really doesn't like having to come up with an idea when there are any constraints, such as having to shoot outdoors or having to do a chase scene.
She is the most responsible person out of our friend group, but constantly protests that she's not a responsible person (except toward her cats). She is very vocal about never wanting children, but she acts like a mother to all of our immature guy friends. She does
all the cleaning. She takes charge of the bills. Despite her professed love of alcohol she never gets drunk at parties because she's too busy making sure nobody dies or wrecks the apartment, even when the party's at somebody else's place.
So everybody else! Describe your favorite non-traditional SJs! Because guess what—they exist!