Joker, is Batman's enemy par excellence, a criminal, one of the most dangerous in Gotham City. A weird character, a professional killer with a total lack of control. And sanity who enjoys killing innocent people for the fun of it. In the cinema, he was represented by great actors: from Jack Nicholson to Heath Ledger, who played in the film The Dark Knight. Who died prematurely and became a legend. The figure of the Joker has had a very wide diffusion and always growing in recent years, in Tattoo Art, due to various factors of different natures.