The main characters of the novel "Maniac Magee," written by Jerry Spinelli, include Jeffrey Lionel "Maniac" Magee, Amanda Beale, John McNab, Mars Bar Thompson and Grayson. Maniac Magee is the main character and is an 11-year-old homeless orphan looking for a home in the fictional town of Two Mills.
Amanda Beale is a young African-American girl, the first person Maniac meets. John McNab is a large 12-year-old boy who is humiliated when Magee is able to hit his pitched fastball. Mars Bar Thompson is the main antagonist to Magee. Grayson is an old groundskeeper at the zoo who finds Magee and befriends him.