Mario is the middle child of the Incandenza family and the only Incandenza son (and E.T.A. student) who does not play a sport. He is possibly actually the son of Charles, whom Mario believes is his uncle. Born prematurely, he has severe physical and mental disabilities. Like James, he makes films, and much of his work bears the mark of James’s style. Mario is the most moral and kind person in the novel. However, despite his kindness, people often only “tolerate” him rather than embracing his company. He cares deeply about others and offers insightful advice, particularly to Hal, with whom he shares a room at E.T.A. He is extremely close to Avril; both Orin and Hal think that Mario is her favorite child.