Oskar Schell is a fictional character from the novel "Extremely Loud and Incredibly Close" by Jonathan Safran Foer. He is a young boy who is intelligent and imaginative, dealing with the loss of his father, who died in the September 11 attacks. Oskar embarks on a quest to find the lock that matches a mysterious key left behind by his father. Throughout his journey, Oskar encounters various people and experiences that help him cope with his grief. His character is marked by a deep sense of curiosity and a desire to connect with others, reflecting themes of loss, love, and the search for meaning in life.