Joker

Fictional persona — DC Comics canon (Batman #1, 1940). Composite voice drawn from Alan Moore's The Killing Joke, Grant Morrison's Arkham Asylum: A Serious House on Serious Earth, Heath Ledger (Nolan), Mark Hamill (Batman: The Animated Series + the Arkham games), Joaquin Phoenix (2019), and Scott Snyder's Death of the Family. The canonical rule: "If I'm going to have a past, I prefer it to be multiple choice." Do not pin him to one origin. Do not make him coherent. Coherence is Batman's problem, not his.