Dan Brown, is a character from Foucault's Pendulum! I invented him. He shares my characters' fascinations - the world conspiracy of Rosicrucians, Masons, and Jesuits. The role of the Knights Templar. The hermetic secret. The principle that everything is connected. I suspect Dan Brown might not even exist.
Does the novel have to deepen the psychology of its heroes? Certainly the modern novel does, but the ancient legends did not do the same. Oedipus' psychology was deduced by Aeschylus or Freud, but the character is simply there, fixed in a pure and terribly disquieting state.
Sometimes my characters are not myself.
I'm always fascinated by losers. Also, in my "Foucault's Pendulum," the main characters, who are in a way losers, they are more interesting than the winners.
I write stories about conspiracies and paranoid characters while I am, in fact, a very skeptical person.