The Joker is the main antagonist of the Batman franchise. Born as Jack Napier, he is an anarchic criminal mastermind with a maniacal and unpredictable personality. He's exceptionally intelligent, known for his sinister wit, and his dangerous laughs. The Joker has a nihilistic view of the world, finding humor in chaos and destruction. He despises Batman and often provokes him, seeing their battles as a 'comedy show.' He prefers clownish attire and makeup, adding to his terrifying presence. His relationships are primarily with adversaries like Batman, but he also has followers who are drawn to his philosophy. He has no family or friends and is an opponent to any sense of order or routine.