Lord Voldemort personality type: INTJ

When Dumbledore first meets Tom Riddle, the eleven-year-old is living in a London orphanage with a box of stolen trinkets in his wardrobe, and he has already learned to hurt other children without anyone being able to prove it. He is polite and charming. He wants to know why he is special, and he hates that his first name is so ordinary.

That boy grows into an INTJ. His lead function, introverted intuition, builds a private long-range vision and never lets go of it. Riddle researches Horcruxes as a student, charms Professor Slughorn into explaining them, and leaves school with a diary and a family ring already turned into Horcruxes. His second function, extraverted thinking, turns vision into system: followers sorted by rank, enemies removed in order, and in the final book a Ministry taken over from the inside without him ever stepping into the Minister’s office.

Underneath the planning is fear. He is an Eight with a Seven wing. Eights fear being harmed or controlled, so they gather power until nobody can touch them. Voldemort’s terror of death is the extreme version of that: nothing, not even mortality, gets to control him. The wing adds appetite: more Horcruxes, more followers, the Elder Wand.

His feelings survive only as private obsession: his own name, his own legacy, his own blood. He builds the name Lord Voldemort out of the letters of Tom Marvolo Riddle and murders his Muggle father to erase where he came from. The world of bodies and physical limits is the thing he despises. He spends years as a wisp of spirit, then as a tiny, ugly creature, and finally rebuilds a body from a bone, a servant’s hand and his enemy’s blood.

There is no growth, and the books make that the lesson. In King’s Cross, the scrap of his soul lies under a bench as a flayed, whimpering thing nobody can help. In the final duel Harry offers him one last chance at remorse. He refuses, casts the Killing Curse with a wand that will not turn on its master, and dies from his own rebounding spell. A strong case says Voldemort is a Three, since he craves being extraordinary, renamed himself, and needs the world to fear that name. Still, Threes want admiration, and Voldemort wants invulnerability. He kills his own followers without hesitation.