The Joker is a major villain in the Character What franchise, The Joker is the enemy of Batman and a villain from the DC universe.
Character What: Hero Force
In Villains of Gotham, Joker play his role as the main antagonist of the episode, The Joker plan revenge on Batman by guide up many of Batman's enemies to help him with his plan.
Character What: Villains Revenge
The Joker makes his return in Let's Had Fun with the Joker, The Joker send many of Shadow Joe's enemies to attack his friends, He last send Jablo the Little Snow Fox to attack the Piplings. but Shadow Joe got there in time to save them and defeated Jablo.