Alvy Singer is the main character in the film Annie Hall, directed by Woody Allen. He is a neurotic and introspective comedian living in New York City. Alvy struggles with relationships and his own insecurities, often reflecting on his past experiences and the complexities of love. Throughout the film, Alvy's interactions with Annie Hall, played by Diane Keaton, highlight his difficulties in maintaining a romantic relationship. The story explores themes of identity, communication, and the challenges of modern relationships, all presented through Alvy's unique perspective and humor.