Harry: ISFP
Ron: ESFP
Hermione: ISTJ (in response to some who said she was too emotional to be a T, well, remember MBTI dosen't indicate the quantity of intelligence, emotion or your abilities, it simply indicates your preferences, or your dominant functions, even if it may be boredeline).
Luna: INTP for sure. She shows complete apathy towards criticism and is always detached emotionally, even when she was in a cell in DH, she didn't show a hint of fear or distress. She is able to think the same in a dangerous situation as she would when being on a picnic. In OOTP she remained calm, so detached from everything... She reminded me of Dumbledore in crisis situations. Plus, she is bluntly honest, uncaring about other's feelings when she delivers what she think is the truth. She disliked Hagrid as a teacher because she finded him incompetent(INTP loath incompetence!) even though she probably had nothing against him as a person. It is clear she has INTP values, such as intelligence, truth... She thinks abstracally even though sometimes there's a fine line between her madness and genius...Yes, untypically of an INTPm she dosen't care for facts, but then who on earth fits any type 100%? She just puts more faith in her jugdgment than in evidence. And even though it may fail to show, Luna has quite a good logic,even if it's an eccentric one. (Resolved the egnima of the Ravenclaw portrait entrance quite easily while many like Hermione would have remained stuck. Plus she uses her head more than it appears, she was able to know that "Barny" was Harry, just by recognizing the same pattern in probably his manners, expressions,etc that would be unoticable for most people). And, it's quite common for INTP to be absent-minded, eccentric. It's beyond me why anyone would think of her as an INFP.
Minerva: ENTJ.
Severus: INTJ
Now... I have some questions for all of you. Can someone please explain to me the logic with typing:
Hagrid: ISFJ: OK, to me he's an obvious SFJ, but why an introvert? Unless my memory deceives me, I remember him being quite chatty, being open and social with lots of people, talking to people easily. He seems to love to talk, IMO. I didn't see any sign of inrtoversion in him. Now..I'm not sure if it's in THIS forum where I've seen him typed as an ISFJ, but that's what the grea majority of people seem to agree on, in this matter.
Dumbledore: INFJ. Allright, I think he's an NFJ. But again, why an introvert? He did make plenty of pointless small talk on more than one occasion and seemed to be a people person. Of course, he used them as pawns, and was very secretive, but only because(in his view) it was a necessity to "save the world for the greater good", not because he didn't value the individual, or didn't want to share his ideas, he just knew no one would understand. Personnally, I would consider him an ENFJ.
Lily: INFJ. ?? Why an IN? From the little Lily scenes in DH, she proved to be quite a bit judgmental(unknown to her), making hasty judgments, being impulsive. She didn't appear to have a gift for reading people, or guessing their motives. She is the black-and-white self-righteous person and certainly isn't empathetic. Yes, she was concerned with morals, and wanted to change the world for the best(probable reason for joining the Order) but didn't act very fair with everyboy. (Didn't give equal chances...). She is quite unforgiving too. She's an obvious flawed J, and even an FJ, since she appeared to follow her heart more than her head(went out with James even though he was a bully and she hated bullies, (but also she thought he had changed and didn't know James still bullied behind her back either), bashed Severus's friends but made excuses for the Marauders who were equally crappy people at the time, bullying everyone "beneath them").
It is clear that Lily didn't follow any reason or logic, thus making her an irrational F. But honestly, did we even see Lily using N(Ni, Ne) or S(Se, si)? I don't think so, unless something escapes me, so how can we classify her an N or S? As for I vs E... Well, Lily, according to JKR, was quite popular, Giiny-alike(don't agree, but whatever), sociable, had many friends. It can point towards a E preference. But, she remained Severus's best friend for approximatively seven years, and tried to keep Petunia in her life, showing loyalty and preferance for having a few close sincere friendships. That might point to an I preference. Obviously, Lily ended up being disloyal to Severus(but to her defense, she probably didn't notice it, and it was provoked by her lack of understanding, Severus's temper, and serious misunderstanding and bad communication between the two) afterwards. And, the fact that adults were all about James's friends, never mentioning Lily's other friends than Severus can be a proof that unlike her friendship with Severus and Petunia, which didn't work out due that Petunia ditched her and that she ditched Severus, her other relationship may have been shallow superficial ones(points to E preference).
There are many contradictions showing Lily as an E, as an I... But I think there's more indications of her being an E.