No doubt about it, this talking, dancing, fiesty little moogle is an awesome ally to have. But mog is an optional character. To aquire him, you must at some point mid-way through the game chase a thief through Narche. The theif will take Mog hostage, but this human-loving little guy puts up one heck of a fight, and winds up dangling off the side of a cliff! Go help him right away, or he'll fall. But once you help him, he joins your party, and boy can this fella be one valuable asset! Mog can 'Dance' around any enemy. Just take Mog to different types of places, fight with him, and he'll learn area-specific dances! However, once he starts dancing, you can't control him.