Heath Ledger’s Joker is an anarchist with unclear origins who delights in creating chaos in the streets of Gotham and testing Bruce Wayne’s moral code. The Joker is portrayed by Heath Ledger in an award-winning performance in The Dark Knight. Katherine Hemmings dressed as Squirrel Girl for the event. He has appeared in all 3 film trilogies, deadpool costume adult each having its own unique take on the character.