The joker

 The Joker is a fictional character, a comic book super villain appearing in publications by DC  Comics. He was first introduced in Batman#1(spring 1940) and has remained consistently  popular. The joker is a master criminal with a clown-like appearance. Initially portrayed as a  violent sociopath who murders people for him amusement, later began to be written as a smart  trickster thief.

           THE JOKER is probably the only villain loved more than the hero by the fans. 

         

                                 The Joker is renowned as Batman's greatest enemy.

The Joker has been referred to as the Clown Prince of Crime (or Chaos), the Harlequin of Hate (Havoc), and the Ace of Knaves.

The Joker commits crimes with weaponized comic props such as a deck of bladed playing cards, an acid-squirting flower, cyanide-stuffed pies, exploding cigars filled with nitroglycerin, harpoon guns that utilize razor-sharp BANG!-flags, and a lethally electric joy buzzers. His most prominent weapon is his Joker venom, a deadly poison that infects his victims with a ghoulish rictus grin as they die while laughing uncontrollably.

                                                            Always Laughing

According to me the best portrayal of THE JOKER was done by HEATH LEDGER. He completely transferred himself into the joker and performed really well. The joker always seems to be happy and even carved smiles with a knife on either side of his cheeks.No one knows exactly what drove the man behind the makeup to become the villain he is today,but no matter what the reason always seems to find the irony in every thing. HAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAAHAHAH........................