I don't know who is responsible for the creation of image portraying some of the Jokers, but I find it to be very accurate. Over the years we have seen the Joker portrayed in a variety of ways. Some have been to our liking and others have not.
- Cesar Romero and Jack Nicholson (Batman 1960's series & Batman 1989 Movie), have given the clownish feel to the character of the Joker. The silly antics, the props, and the exaggerated expressions entertained audiences as a clown does. A dangerous clown at that.
- Heath Ledger and Jared Leto (The Dark Knight 2008 & Suicide Squad 2016), portray the anarchist, terrorist, psychopath character of the Joker. The dark actions, the killings, the senseless violence, and the psychological twists.
So we have two extremes established for the Joker; The Clown and the Anarchist. The Clown, while suitable in cartoon form, is discomfited in a live action film. The Anarchist, while fitting for a terrorist thriller, does not depict the Joker's true character.
The best depiction of the Joker however, has been in the animated form. Many of the animated Jokers have struck a distinct balance between the clown and the killer.
Mark Hamill, known for his role as Luke Skywalker, has voiced the Joker for several animations and video games. Several other notable voice actors have also depicted the character of the Joker that perfectly combines the Clown Prince of Crime and the Dangerous Psychopath. There has been a distinct difference between the Joker and a terrorist/anarchist in makeup.
The development of Harley Quinn's character portrayal is also similar to that of the Joker.
From the original animations, Harley was a playful, carefree, psychopathic, gleeful assistant to the Joker. Now with Suicide Squad, it seems that Margot Robbie will be showing the dark side of Harley. No longer that seemingly harmless right hand to the Joker.
The new, darker sides to the Joker and Harley certainly may not be to the audiences' displeasure, but they are definitely not the characters that have made Batman such a successful franchise. Since the creation of Joker and Harley, the greatest portrayals have been in the key balance between the Clown and the Killer.