Ignatius J. Reilly is the fictional protagonist of the novel "A Confederacy of Dunces," written by John Kennedy Toole. He is a quirky and eccentric character known for his distinctive green hunting cap and his disdain for modern society. Set in New Orleans, the story follows Ignatius as he navigates various misadventures while trying to find a job and make sense of the world around him. Ignatius is characterized by his intelligence, strong opinions, and a unique worldview shaped by his love for medieval philosophy and literature. His interactions with a colorful cast of characters highlight themes of absurdity and social critique, making him a memorable figure in American literature.