The fairy tale character who leaves a glass slipper at a ball is Cinderella. This classic character appears in various folklore versions worldwide, but the most famous account comes from Charles Perrault's "Cinderella" published in 1697. In the story, Cinderella is mistreated by her stepfamily but, with the help of a fairy godmother, attends a royal ball. When she departs before midnight, she leaves behind a glass slipper, which the prince eventually uses to find her. The tale emphasizes themes of kindness, resilience, and the transformative power of love and magic, making it a timeless favorite.