Marian Paroo is a fictional character from the musical "The Music Man," created by Meredith Willson. She is portrayed as a strong-willed and intelligent young woman who serves as the town librarian in River City, Iowa. Marian is known for her love of books and her desire to improve her community through education and culture. In the story, Marian becomes the love interest of Harold Hill, a con artist posing as a band leader. Throughout the musical, she evolves from a skeptical and cautious individual to someone who embraces love and the potential for change in her town.