An old coworker of mine who was very much a mentor to me was, I believe, an ESTJ, albeit not that immature although from many of his stories, he certainly exhibited some of the immature behaviors described, back in his teenage years. He was around 5 years older than me.
Confidence was paramount although he didn't directly bitch about someone else's lack of confidence; he would approach it from the "well, if you can't step up to the plate, we're not giving you the homerun" standpoint which I did admire. I am a firm believer that people need to earn their own accomplishments.
Dunno about style; he always dressed appropriately, whether it was jeans and a rock band t-shirt or dress pants and a shirt/tie. He definitely preferred the former though, but who wouldn't?
This dude would stress over damned near anything; ordinary tasks I would find simple and easy, he would obsess over the details and would continually insist that I do too, guiding me into them with statements such as "so did you check all 4 sections?", which I'd think "no, because I just did a search/replace and know it was fine..." but he would absolutely insist on double-checking. Now I am not complaining about that; laziness is no excuse for royally fucking up a crucial computer system, so that kind of detail-obsession is valuable in such scenarios. But for him it was the central focus; if someone asked him to make changes to a system that were sweeping in nature, no matter how important they are, he would freak out and push back on the request under the pretense that it would take hours to go through and verify everything. If it was absolutely necessary, then obviously he'd do it but you could tell he's stressed and unhappy the entire time. Again, not necessarily a bad thing, just not something I would stress over. When learning new systems (eg stuff purchased from 3rd party vendors), he would insistently focus on the fine details of the implementation, even the stuff that we're not required to know because the vendor's supposed to take care of it. It's just stuff that I found unnecessary to pore over unless proven necessary, at which point I knew it was just a few minutes of reading a manual or online document and I'd have it down... Oh yeah, and any form of automated system that does all the intelligence for him, he would not trust since he would automatically assume it doesn't know what it's doing.
His humor definitely exhibited an air of insensitivity, although I still found some of it funny half the time. He'd find a sick humor in jokes such as "What do you tell a woman with a black eye? Nothing; you've already told her once!"... that's the kind of joke he'd only say in private to someone he knows well. One of the funniest things he did happened while I was carpooling with him; I was dozing off a bit, and we were in city traffic moving along (~30mph or so), he reached over and slapped the dashboard hard while slamming the brakes. I woke up in a real hurry all freaked out thinking we'd just got into an accident; he started laughing. His wife said that wasn't the first time he'd done that
