Who is Anthony "T.C." Keller from My Most Excellent Year: A Novel of Love, Mary Poppins, and Fenway Park and what is their importance?

T.C. Keller is one of three main characters, and one of three main principle protagonists in Steve Kluger's novel "My Most Excellent Year." Fifteen-years-old, T.C.is pretty typical American kid. He is intelligent, confident, and kind. He lives with his father and attends high school in Boston, where he is a B student in school.