Giorno Giovanna may be a gangster, but he has a strong sense of justice and a desire to protect the innocent. He gets that sense of justice from one of his fathers, Jonathon Joestar, the hero from the first part of JoJo's Bizarre Adventure.

An ambitious individual, he readily takes any occasion to achieve his final goal of becoming a "Gang-Star". Upon beginning to cooperate with Passione gangster Bruno Bucciarati, Giorno wastes no time in infiltrating the gang, and works up the ranks.