- "I used to think that my life was a tragedy, but now I realize, it's a comedy."
- ―Arthur Fleck[src]
- This is the fourth version of the Joker (fifth if you count Jerome Valeska) in media to be given an actual name and backstory, following Jack Napier in the 1989 Batman movie, Martha Wayne in Flashpoint, and Jeremiah Valeska in the television show Gotham.
- His backstory as a failed stand up comedian is similar to one of his possible backstories depicted in the acclaimed comic book Batman: The Killing Joke.
- His appearance appears to be a mix of both Cesar Romero's Joker from the campy 1960s series Batman and Jack Nicholson's Joker from the 1989 film Batman, as well as Heath Ledger's Joker from the 2008 film The Dark Knight.
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