Joker (Earth-9422)

The Joker is a psychotic criminal mastermind and terrorist based in New York City, being the result of Batman's crime fighting against his old persona, the Red Hood, until he fell into a acid vat in ACE Chemicals which turned his skin chalk white and his hair dark green. After his one bad day, the Red Hood became the Joker, turning into the embodiement of chaos itself, executing his crime through the deaths, pain and suffering of many, as well as coming into the Batman's way in order to test his own morality and sanity.

After clashing with the dark knight numerous times, the Joker executed Batman's partner, Robin, as well as paralyzed Batgirl by shooting her in the spine. Over the years the Joker also crafted his psychiatric, Doctor Harleen Quinzel, into his faithful follower, Harley Quinn. In a act to call out Batman's attention, the Joker allied with Crossbones, which ensued into a terrorist attack in Zambia, Africa, killing countless of civilians. His actions would then open the doors for the occurance of the Sokovia Accords which obligated every superhero to register to the United Nations.

Abilities

 * Genius-Level Intellect: Joker is extremely intelligent, able to go to-to-toe with Batman for years.
 * Master Tactician: Joker is a genius at planning and improvising criminal activities, despite his insanity being capable of sometimes impairing his higher thinking. While scheming, the Joker usually manages to stay one step ahead of the police, and sometimes even Batman himself, due to him being completely unpredictable. Hence, he was ultimately able to somewhat gain the upper hand against his opponent by finally managing to trap and murder Batman's protegee Robin.
 * Intimidation: Joker, due to his capacity for heinous torture and murder, commands a very intimidating presence, enough to frighten low-level thugs and make them work for him out of the sheer fear of what he would do to them if they refused. This is the one quality that Joker and Batman have in common to an extent.
 * Indomitable Will: Joker possesses an obliviousness to danger that makes him invulnerable to fear and intimidation, which are usually Batman's greatest weapons in combat. Hence, Joker does not fear death and will even threaten his own life to achieve his goal or make a point. This makes the Joker the dark knight's most formidable enemy.

Equipment

 * Jokermobile: Personal stylized car, which reflects his flamboyant and twisted clownish personality.