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.