Play all six standard characters until they are fully developed on the same memory card. Then start a new game, go to the "One Player" menu, select the "Load Character" option, and choose the memory card with the six characters. Return to the "One Player" menu, highlight "Load Character", and hold Left or Right until the character portrait changes to a new person (alternate versions of the townspeople). Fully develop the new character and repeat the steps to unlock more characters.
