Round characters are complex and realistic, while flat characters lack depth. Minor characters like foils highlight main characters' traits through contrast.
Round characters have multiple personality traits, making them complex and realistic, while flat characters have simplistic traits and lack depth. Round characters, like Hermione Granger in Harry Potter, undergo growth and internal conflicts, adding richness to the story. In contrast, minor characters, especially foils, emphasize the traits of main characters through contrast.
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