Influences
Through his written works, as well as in interviews, Larsson acknowledged that a significant number of his literary influences were American and British crime/detective fiction authors. His heroine has some similarities with Carol O'Connell's "Mallory", who first appeared in Mallory's Oracle (1994). In his work Larsson made a habit of inserting the names of some of his favourites within the text, sometimes by making his characters read the works of Larsson's favorite authors. Topping the list were Sara Paretsky, Agatha Christie, Val McDermid, Dorothy L. Sayers, Elizabeth George, and Enid Blyton.
One of the strongest influences originates from his own country: Pippi Longstocking, by Sweden's much-loved children's author Astrid Lindgren. Larsson explained that one of his main recurring characters in the Millennium series, Lisbeth Salander, is actually fashioned on a grown-up Pippi Longstocking as he chose to sketch her. Additional connections to Lindgren's literary work are in the Larsson novels; for example, the other main character, Mikael Blomkvist, is frequently referred to mockingly by his detractors as "Kalle Blomkvist", the name of a fictional teenaged detective created by Lindgren.
The name Salander was actually inspired by the strong female character in the Kalle Blomkvist trilogy by Astrid Lindgren, Kalle's girlfriend Eva-Lotte Lisander.
Larsson has said when he was 15 years old, he witnessed three of his friends gang-raping a young girl, which led to his lifelong abhorrence of violence and abuse against women. His longtime partner, Eva Gabrielsson, writes that this incident "marked him for life" in a chapter of her book that describes Larsson as a feminist. The author never forgave himself for failing to help the girl, and this inspired the themes of sexual violence against women in his books. According to Gabrielsson, the Millennium trilogy allowed Larsson to express a worldview he was never able to elucidate as a journalist. She described, in great detail, how the fundamental narratives of his three books were essentially fictionalised portraits of the Sweden few people knew, a place where latent white supremacy found expression in all aspects of contemporary life, and anti-extremists lived in persistent fear of attack. "Everything of this nature described in the Millennium trilogy has happened at one time or another to a Swedish citizen, journalist, politician, public prosecutor, unionist, or policeman," she writes. "Nothing was made up."
Similarities also exist between Larsson's Lisbeth Salander and Peter O'Donnell's Modesty Blaise. Both are women from disastrous childhoods, who somehow survive to become adults with notable skills, including fighting, and who accomplish good by operating somewhat outside the law. One of Larsson's villains, Ronald Niedermann (blond hulk), has much in common with the invulnerable, sociopathic giant named Simon Delicata in the fourth Modesty Blaise book A Taste for Death.