While Super Mario RPG includes many of the characters that fans of the franchise have come to expect, it also introduces a large roster of new characters to the cast. As players explore the world, they will encounter all sorts of these unique Super Mario RPG-exclusive characters. Some will aid them, others will fight them, but all of them will lend their unique charm to the experience. And perhaps one of the best new additions to the roster comes in the form of the many inhabitants of Yo'ster Island.