Joker is the leader of a group of criminals and thieves headquartered in Mt. Rocko and commonly referred to as Joker's Gang. They take a keen interest in Nina and Mina, the princesses of Wyndia. Their harassment toward the sisters escalates throughout the early stages of the game. Eventually, the gang takes Mina hostage in an attempt to lure Nina to Mt. Rocko and force her to become Joker's slave. However, before Nina gives into Joker's demands, Ryu and Katt bust in and attack his cronies. Nina then uses a spell to cause the ceiling to collapse on Joker, rather than killing him, this causes him to lose his temper and out himself as a demon. The party then proceeds to defeat him in battle, thus securing Mina and Nina's freedom.