Biff Brannon is a fictional character from the novel "The Heart Is a Lonely Hunter" by Carson McCullers. He is the owner of a local diner in a small Southern town, serving as a gathering place for various characters in the story. Biff is portrayed as a thoughtful and introspective man, often reflecting on his life and the people around him. In the novel, Biff interacts with other key characters, such as Mick Kelly and John Singer, providing insight into their struggles and dreams. His diner symbolizes a sense of community, where diverse individuals come together, highlighting themes of loneliness and connection in the narrative.