Unlike the multifaceted image of Matt Warner,always reflecting and doubting,Mr. D is a somewhat schematic, secondary, auxiliary character. For, as Dylan quite rightly believes, it was his grandfather - the great teacher the Terrible Norman Warner - who sent Mr. D to school in order to make his father - Matt Warner - the next great teacher. We never see Mr. D alone with himself, we always see him only through the eyes of others - most often through the eyes of Dylan or Matt. Essentially, Mr. D is Norman Warner's will.