Summary
- Joker: Folie à Deux could include various DC characters as minor cameos or minor roles despite its standalone and realistic approach to Batman's mythos.
- Villains like Hugo Strange, the Ventriloquist, Calendar Man, Scarecrow, and Poison Ivy could appear at Arkham State Hospital, while Harvey Dent and the Penguin could surface in Gotham as a direct result of Joker's criminal actions.
- Heroic characters like Jim Gordon and Renee Montoya could persecute the Joker and Harley Quinn, while Alfred Pennyworth could make a cameo providing an update on Bruce Wayne's whereabouts.
While Joker: Folie à Deux takes place in a standalone continuity, there's a small chance that other DC characters will make an appearance alongside Joker and Harley Quinn. Joaquin Phoenix and Lady Gaga star in the Joker: Folie à Deux cast as Joker and Harley Quinn, two Arkham patients who fall in love with each other and become a criminal couple with the same altered perception of reality. Phoenix's Joker and Gaga's Harley Quinn are quite different from DC's traditional depiction of the villains, who share a grudge with Batman and belong in a more fantastical Gotham City.
Matt Reeves' The Batman continuity is adapting Batman's comic book mythos to the big and the small screen, and James Gunn's DCU is set to explore Batman's relationship with other DC heroes and villains. Meanwhile, Todd Phillips' Joker: Folie à Deux focuses solely on Joker, Harley Quinn, and their closest allies and enemies, hence why Batman and other famous Gotham-based characters are unlikely to appear. However, some comic book heroes and villains are relevant enough to Joker and Harley Quinn's story that they could join Joker: Folie à Deux's list of DC characters, at least as brief cameos.
10 Jim Gordon GCPD Commissioner James Gordon Could Lead The War Against Criminals Like Joker And Harley Quinn Close In DC Comics, James Gordon is the Gotham City Police Department commissioner and Batman's right-hand ally. Usually, Gordon is the only truly honest member of the GCPD, and his experience with the organization allows him to help Batman in his vigilante duties without risking his job. While he doesn't fully agree with Batman's justice-seeking methods, James Gordon respects the Dark Knight and is willing to put his life on the line to support the hero. James Gordon is a staple of Batman stories, having appeared in every live-action Batman movie and show so far.
James Gordon might be one of the most likely DC characters to appear in Joker: Folie à Deux. At this point in the timeline, Gordon could be a regular detective who's climbing up the ladder and growing increasingly weary both of his corrupt colleagues and of criminals like the Joker. Although James Gordon is unlikely to play a big role in Joker: Folie à Deux if he appears, the movie could reveal that he already has gotten in touch with Bruce Wayne to provide him with emotional support after the death of his parents.
9 Harvey Dent Joker Could Give Harvey Dent The Perfect Justification For A Political Campaign Close Two events are constant in Harvey Dent's life all across the DC multiverse. First, Dent is a genuinely honest politician who promises to overhaul Gotham City and get rid of its crime and corruption. Second, Dent becomes the victim of an attack that leaves exactly half of his face and body disfigured, affecting his psyche to the point that he abandons his political campaign and turns into a full-fledged villain nicknamed Two-Face. Harvey Dent's traumatic attack leads him to develop an obsession with a 50/50 approach to justice, which Dent represents in the form of a coin toss.
Harvey Dent is an ideal character to include in realistic Batman stories, which makes him a potential candidate for an appearance in both The Batman – Part II and Joker: Folie à Deux. In fact, signs criticizing Harvey Dent were reportedly spotted in outdoor filming locations for Joker: Folie à Deux, which suggests that Joker: Folie à Deux's version of Harvey Dent is already Mayor of Gotham City in the movie and may be leading a public campaign against Joker and his supporters.
If Harvey Dent does appear in Joker: Folie à Deux, it's possible that his transformation into Two-Face happens as a direct result of Joker and Harley Quinn's actions, though the film could risk resembling Harvey Dent's role in The Dark Knight a little too much.
8 Hugo Strange Dr. Hugo Strange Could Be An Arkham State Hospital Psychologist Close Hugo Strange is a Batman villain who has been overlooked by most live-action DC movies and series, with Gotham being the only exception. In the comics, Hugo Strange is a psychologist obsessed with physical and mental perfection. His wish to find a perfect living being leads him to develop a fixation on Batman, and his intellect allows him to discover the Dark Knight's real identity using nothing but deduction. Strange dreams of killing and replacing Batman, but his lack of physical prowess means that he needs to resort to different methods than sheer force to achieve it.