Chemical Waste
During the past 80 years since the Joker was created, he’s had a number of possible origin stories. While none of them have been confirmed as the main one, the most common story involves him falling into a tank of chemical waste that bleaches his skin white, turns his hair green, and turns his lips bright red. The resulting disfigurement is what finally drives him insane.
Not Superhuman
Interestingly enough, the Joker has no superhuman abilities. Instead, he uses his expertise in chemical engineering to develop poisonous or lethal concoctions and thematic weaponry. Some of his more known weapons include razor-tipped playing cards, deadly joy buzzers, and acid-spraying lapel flowers. At times, he works with other Gotham City supervillains like the Penguin and Two-Face, as well as groups like the Injustice Gang and Injustice League. However, these relationships usually don’t last due to the Joker’s desire for chaos.