The Hangover with two more movies.
A potential Robert Pattinson's new Batman occupies a different universe than the one Joaquin Phoenix's Joker inhabits, which means Joker 2 would have to create its own version of Batman. Keeping that in mind, the question then becomes who could possibly play this role.
When casting Batman for Joker 2, there are a number of key factors informing these choices to keep in mind. Namely, the fact that Joker primarily cast actors with strictly dramatic acting experience in its cast, the fact that it'd likely have to be a younger Batman, and the fact that Todd Phillips frequently likes to cast actors he's worked with in the past. With that, here's a selection of actors who could possibly play the Dark Knight in a sequel to Joker.
Miles Teller
The Whiplash leading man has had more experience co-starring in Joker 2's take on Batman.
Armie Hammer
The oldest pick on this list, Sorry to Bother You is any indication, he could totally go toe-to-toe with Phoenix's Joker in portraying on-screen madness, and he could easily portray a charming billionaire with a dark secret.
Harris Dickinson
Harris Dickinson is a name that's new to most people's radars, but his work on last year's miniseries Joker 2's version of Bruce Wayne easily recognizable as a conventional rich socialite.
Harry Styles
After his turn in Joker 2's take on Batman. Like Dickinson, Styles has the good looks to ensure that this take on Bruce Wayne can be an appropriate physical contrast to the intentionally grimy Arthur Fleck. His aforementioned role in Dunkirk, meanwhile, suggested great acting promise that could be further tapped into. The extra-interesting wrinkle on casting Harry Styles in this part is that it's as bold and unexpected of a move as the idea of doing an R-rated Joker origin story movie once was. Todd Phillips doesn't like playing things safe when it comes to Joker and casting Harry Styles as Batman could be an intriguing way to continue that tradition.
Jovan Adepo
Between his work on Watchmen, Jovan Adepo has cemented himself as a talent to watch out for in 2019. The latter was an especially impressive showcase for his gifts as an actor and showed off Adepo's ability to handle morally complex and emotionally powerful roles in a way that would fit right in with the world of Joker. An actor with Adepo's range would be a perfect fit for the casting style of Joker.
While it's true that Bruce Wayne was shown as being white in the first Joker, one could easily chalk that up to figment of Arthur Fleck's imagination could allow the universe of Todd Phillips' Joker a chance to tackle sociopolitical issues related to race. The possibilities of casting Adepo as Joker 2's version of Batman are seemingly endless, and they all stem from just how much talent Adepo has shown off after just a few roles. Such talent would be a welcome presence in any form, Batman or otherwise, in the prospective world of Joker 2.