A dedicated investigative journalist and publisher of the political magazine Millennium whose career is in tatters following a libel conviction. Known for his ethical standards, he accepts an assignment to write a family history for the Vangers as a cover for investigating a cold case.

The sharp editor-in-chief of Millennium magazine and Mikael Blomkvist’s longtime friend and lover. She manages an open marriage and works tirelessly to keep the magazine solvent during the financial crisis triggered by Blomkvist’s legal troubles.

A corrupt billionaire financier who successfully sues Blomkvist for libel, severely damaging the journalist's reputation. He represents the type of corporate corruption that Blomkvist is dedicated to exposing.

A socially withdrawn but brilliant private investigator and hacker working for Milton Security. Possessing a photographic memory and a fierce moral code, she is initially assigned to vet Blomkvist before eventually partnering with him.

The wealthy, reclusive former CEO of the Vanger Corporation obsessed with the decades-old disappearance of his great-niece, Harriet. Believing she was murdered by a family member, he hires Blomkvist to solve the mystery before he dies.

Henrik Vanger���s favorite great-niece who vanished without a trace in 1966, leaving behind a mystery that haunts the family. Though long presumed dead, her disappearance serves as the central puzzle driving the narrative.

The CEO of Milton Security and Lisbeth Salander’s employer who respects her talents despite her abrasive nature. He acts as a protective figure toward her, though he often struggles to understand her behavior.

The loyal, elderly lawyer and confidant to Henrik Vanger. He serves as the intermediary who arranges Salander's background check on Blomkvist and later recruits the journalist for the assignment on Hedeby Island.

Lisbeth Salander’s original legal guardian and the only authority figure she trusted, known for being kind and supportive. His sudden stroke leads to his replacement by a sadistic new guardian, altering the course of Salander's life.

A sadistic lawyer who becomes Lisbeth Salander’s legal guardian, gaining control over her finances and life. He abuses his position to torment her, unaware of her capability for retaliation.

Harriet’s brother and the current President of the Vanger Corporation who lives a solitary life on the family estate. He appears as a polished businessman who welcomes Blomkvist to the island despite the family's eccentricities.