One of the three lead characters in Pulp Fiction, and a Villain Protagonist. Together with Jules, he's part of Marsellus Wallace's organized crime group. Vincent has just come home to LA after serving in Amsterdam for about three years. Compared to Jules, he's pretty lousy at his job, utterly genre blind and dumb, a heroin addict suffering constipation (a side effect of heroin), and on top of that he tends to be a big jerk.
Along with Mia, he's the protagonist of the film's first segment.