Harry Potter — ISFP
Harry leads with Introverted Feeling — his moral compass is private and non-negotiable — supported by Extraverted Sensing (Quidditch reflexes, in-the-moment combat). He is mistyped as a 'hero ENFJ' often, but his decision-making is consistently Fi-Se, not Fe-Ni. Big Five: mid Openness, low-mid Conscientiousness, elevated Neuroticism. Enneagram 6w7.
Hermione Granger — ESTJ
Hermione is the cleanest ESTJ in young-adult fiction: dominant Te (rules, systems, S.P.E.W., timetables), Si (encyclopaedic recall), Ne (creative problem-solving in crises), inferior Fi (her values are real but expressed through action, not words). Often mistyped as INTJ — but INTJs lead with Ni, not Te.
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Ron Weasley — ESFJ
Ron is Fe-dominant — he reads the emotional room faster than anyone, which is why his insecurity around Harry and Hermione is so painful. Si gives him loyalty to family and tradition. He is the cognitive opposite of Snape, which is partly why they grate on each other.
Albus Dumbledore — INFJ
Dumbledore is the saga's archetypal INFJ: Ni driving a multi-decade plan most people cannot see, Fe shaping students with surgical precision, Ti operating his moral calculus, inferior Se manifesting in his attraction to the Hallows. His flaws are textbook unhealthy INFJ — over-trusting his own vision.
Severus Snape — INFJ (wounded)
Snape and Dumbledore share a cognitive stack — both INFJ — which is precisely why Dumbledore can use him. Snape's Ni-Fe is wounded by unresolved Fi-shadow grief (Lily), which is why he reads as colder and more bitter than Dumbledore despite the identical function order.
Lord Voldemort — INTJ
Voldemort is a corrupted INTJ — Ni locked on immortality, Te executing without ethical constraint, Fi collapsed entirely, inferior Se driving his theatrical cruelty. He is the saga's structural answer to Dumbledore — same outcome-orientation, opposite ethics.
Luna Lovegood — INFP
Luna is an INFP with unusually integrated Ne — her openness is so total it reads as detachment. Big Five: extremely high Openness, low Neuroticism, mid Agreeableness. Enneagram 9w1.
House alignment vs cognitive type
Hogwarts houses correlate with values, not cognitive type. Gryffindor selects for high Fi/Fe + Se courage (Harry ISFP, Hermione ESTJ, Ron ESFJ — three different types, shared willingness to act). Slytherin selects for Ni-Te ambition (Snape INFJ, Voldemort INTJ, Draco ESTJ). Ravenclaw selects for Ti/Ne. Hufflepuff selects for Si-Fe loyalty.