This person may be more difficult to type because he has issues with depression and social anxiety, but I'll try to describe him as objectively as possible. He also believes he suffers from Scrupulosity. I do not know if that last one is type related.
I'm inclined to see him as an IxFx, and his most obvious dichotomy is Negativism.
The thing that stands out most about him to me is the way he holds onto grudges and the negative emotions from events forever. If he's reminded of a situation which made him unhappy at any point in his life, he gets somewhat of an "angry" tone and mentions it as if it happened yesterday. A lot of things that wouldn't bother most people all that much really upset him. It's a bad idea to let him see a movie where some horrible injustice happens to a character because it is all he will remember of the movie, and it will upset him greatly. He may even go off on an "angry" rant and storm out. He will remain upset for hours, and will get upset again if something happens that reminds him of that movie. It's also a bad idea to mention similar irl stories for the same reason. He wishes ill on those who he sees committing these injustices. He tends to label guilty parties and then judges them or those similar to them too harshly later, even in seemingly unrelated circumstances. For example, his brother in law told about something some great injustice at his workplace and community involving Hmong population, and then decades later he'll sneer when someone mentions the Hmong. He warned me against investing in real estate in a specific city because of a higher than average number of its residents are Hmong. When I asked him why that mattered, he got a bit agitated (not at me) and went into the stuff his brother in law had told him. That's just one example... but I don't see him as a particularly racist person. He makes those types of judgments about all kinds of people/organizations/situations. It always happens like that, too... when asked how the past experience he's recounting is relevant (because it's generally not), he's unable to come up with a good reason.
I've never seen him get upset like that about a situation involving anyone he's close to though. He doesn't appear to hold grudges against loved ones. He also recalls happy memories in as much detail as the unhappy ones, and will tell the story about it if something reminds him of it.
He is a very loyal and trustworthy person. He is somewhat paranoid about being used or fooled or taken advantage of though. (For example, he and I bought laptops from Best Buy within the same week, and I had signed up for their reward card because I'd be getting like $120 in the mail in gift certificates and the rewards card only costs $10 or something like that. When I mentioned this, he got upset, thinking he had somehow been duped because nobody had told him about the card when he made his purchase.) When something doesn't work out, he says, "I knew something would screw this up."
He is a kind and good-natured person, overall, but also very reserved. When I was a bartender I talked to a couple people who worked at the same place he does, and they both pretty much said, "Oh yeah, I know him. He helped me out once with something I had a problem with. He really keeps to himself though. He never seems interested in conversing or getting to know people outside of his department. He just wants to get what he came for and go back to the tool room... I mean, he's not rude or anything, just untalkative."
He is pretty risk adverse and dislikes change. He tends to worry a lot, too (such as worrying that the company he works for will go out of business), especially if there's a big decision to be made. For example, he worked at a stressful job where he was underpaid for a long time (seven to ten years maybe?) even though he could have found a job in his field (he's a tool and die maker) that would have paid him more. He had no interest in looking though, and he was unwilling to drive to a different city for work. I think part of the reason that he stayed was because he felt that they'd be kind of screwed without him. It was a small family company (the husband, wife, son, and son in law were the only other employees) owned by people we went to church with, and the husband faced some very serious health issues. Not long after the husbands death he decided it was time to find a new job. I think the son was running the company poorly or something like that. If that job or family is brought up, he gets sorta upset as described above, as if he was ripped off somehow, or disappointed in himself for making a bad decision.
He's the type of person that only has a few friends, but stays friends with them for a very long time. He doesn't see them very often though.
Aside from what I've described above and only around people he's close to, his temperament is generally pretty laid back. He talks happily to people he's close to, such as his family or the three or four people who work in his department. He jokes around and says somewhat goofy things, if he's in a really good mood. He'll occasionally say things like "negatory big bird" instead of no, which has been something he's said since his children were very young.
Mmmmmmmmmm not sure what else to say for now. I'll write more if I think of anything.