Millie Dillmount is the main character in the musical "Thoroughly Modern Millie." Set in the 1920s, she is a young woman who moves to New York City with dreams of independence and success. Millie embodies the spirit of the era, seeking a modern lifestyle and a career in the fast-paced world of the city. Throughout the story, Millie navigates various challenges, including love and friendship, while trying to find her place in a rapidly changing society. Her journey reflects the aspirations of many women during the Roaring Twenties, as they sought to break free from traditional roles and embrace new opportunities.