Princess Plump and Princess Muffintop act as the main focus of many of Fat Princess's and are central characters to the solo story mode. The characters are mostly portrayed as aloof to the things going on around them and are primarily interested in consuming cake. The more cake they consume, the more slowly they can be carried from one place to another. They are known to be best friends that love to spend time with each other. Princess Plump is supposedly nice and sweet, while Princess Muffintop is mean and sassy.