Joaquin Phoenix has said that it would be a character study. In an interview with Collider, Joaquin Phoenix said, “Three or four years ago, I called my agent and said ‘Why don’t they want to take one of these characters and just make a lower budget film about it, a movie but a character study, and why not take one of the villains?’”
The film may have Joker as the lead character, but it would be less of a comic-book film and more of a tale of one man’s descent into the world of madness.
Don’t expect eye-popping visual effects and CGI à la Marvel Cinematic Universe.