Batman: White Knight stopped with a fist, i.e. Batman's methods. This led him to turn the Joker into a politician, using the character's intelligence and charisma to win the people of Gotham over. DC Comics had no problems with the ideas that Murphy had for the series such as changing the timeline in Batman's history. However, the adult content like nudity and profanity that Murphy had intended to include were not permitted. Murphy revealed that the Joker in "White Knight" has the real name Jack Napier, a callback to Tim Burton's 1989 "Batman" film where the Joker played by Jack Nicholson also shares
Batman Beyond: Return of the Joker Chucko was inspired in a clown costume of Eric Radomski, while the character of Ghoul's design was loosely based on The Scarecrow, one of Batman's original foes. The character of Woof was created as a tribute to Bud and Lou, the pet hyenas of The Joker in "". Dee Dee's original designs were also very different to the final ones, resembling very much the classic disguise of her grandmother Harley Quinn. Besides the main cast of the TV series (who returned to reprise their roles), the producers also cast Michael Rosenbaum, a voice actor that voiced many characters in "Batman