The Warner Bros.' own DC cinematic universe that would consist of multiple integrated franchises. Several beloved heroes from the DC Universe have made the jump from to screen for almost a full decade and continues to do so today. Even though the DCEU has gone in other directions since 2017, various Justice League are still coming to life. Despite the Justice League coming together in Zack Snyder's Justice League, it may be a while until the team is seen again cinematically.
Even if the team is not always together on the big screen, the DCEU is still heavily consisted of canonical . Whether it was in the Golden or Silver Age of comics or in the modern books, the team keeps adding more characters to the line-up, even villains who have been reformed. Aside from the characters who have shown up in the films, there have also been many Justice League-inspired Easter eggs or references to heroes that exist in the DCEU. While things are unclear just how interconnected the DCEU will be in coming years, Warner Bros. is still creating franchises based on Justice League heroes.
The longer the DCEU goes on, the more opportunities there will be for other characters who have a history with the beloved DC Comics team of heroes. Who knows what other Justice League will be in the DCEU within the next 5-10 years? For the time being, which Justice League heroes and have the DCEU introduced over the years, whether it be in prominent or more minor roles?
Superman
Since the Justice League's inception in the comics, Superman has been one of the founding , which is why it made perfect sense to have the DCEU kick off with him. Henry Cavill's Clark Kent may not have been alive when the Justice League was founded, but at least Superman is the reason the team was created within the context of the DCEU.
Batman
Bruce Wayne may not have superpowers, but Batman has proven time and time again that he may be the Justice League's most dangerous member due to how calculated he can be. Ben Affleck's version of the Dark Knight is so far the oldest cinematic iteration fans have seen, as this Batman had been operating for over 20 years in the DCEU. Affleck's next (and maybe final) appearance in the DCEU will be in The Flash movie.
Wonder Woman
Even though Man of Steel came out before Batman v Superman: Dawn of Justice and Justice League, Wonder Woman helped create the team with Bruce.
The Flash
One of the metahumans Lex Luthor was monitoring was Barry Allen, a.k.a. The Flash, with Ezra Miller playing the DCEU iteration of the beloved Justice League speedster. Besides having a cameo in Miller's Barry will finally be getting his own adventure in The Flash movie.
Cyborg
Victor Stone, a.k.a. Cyborg, may not have been a founding Justice League member in the original comics, as he was best known as being part of the Teen Titans. However, The New 52 changed all of that in 2011 when DC rebooted their continuity. That led to the DCEU following a similar route with Ray Fisher's Cyborg, who got introduced in Batman v Superman: Dawn of Justice before his bigger role in Zack Snyder's Justice League.
Aquaman
The third member that Bruce and Diana recruited for the DCEU's Justice League was Arthur Curry, a.k.a. Aquaman, who was also part of founding the team in the original comics. Portrayed by Aquaman took place, where he became King of Atlantis.
Martian Manhunter
When Harry Lennix first ed the DCEU in Man of Steel, he was playing General Swanwick, an original character for the movie. However, Snyder ended up retroactively changing Lennix's role within his DC Universe by having him revealed to be J'onn J'onzz, a.k.a. the Martian Manhunter. Despite the Snyder Cut not being DCEU canon, had it been released in 2017 as originally planned, it's not like other films couldn't use Lennix's Martian Manhunter.
Mera
Wonder Woman isn't the only Justice League heroine who exists in the DCEU as there is also Mera, as played by Amber Heard. In Zack Snyder's Justice League and the theatrical cut, Mera was briefly introduced prior to Aquaman's storyline, where she played a much bigger role.
Shazam
While the DCEU's version of Billy Batson may not have come into with the whole Justice League yet, Shazam is one of the primary in the comics. However, 2019's Shazam did establish how much the Justice League is known within the DCEU through multiple references and Easter eggs. Even if it wasn't Cavill in the suit, Zachary Levi's Shazam did manage to befriend Superman as he showed up at the school in the final scene.
Ryan Choi
In Zack Snyder's Justice League, one of the restored characters that got cut from the 2017 film was Ryan Choi, played by Zheng Kai. Ryan was working heavily with Dr. Silas Stone at S.T.A.R. Labs before the latter's ing. By the end of the Snyder Cut, Ryan got referenced as the director of nano-technology, alluding to his role as The Atom in the comics. After the 4-hour cut was released, Snyder had revealed that he had initially pitched an Atom spinoff which would have seen Ryan become his Justice League comic counterpart.
