The clearest answer is Peacemaker himself, which given the historical backdrop of the character in the comics with Blue Beetle in the Pre-New 52 run, could mean a cameo appearance in the impending Blue Beetle film. Nonetheless, given the teenage-driven lead of that film, it very well may be improbable that DC and WB want to feature a character who is conspicuously part of a R-rated property. Regardless of whether it isn’t Peacemaker, there are as yet several movies and TV programs being developed and a universe of potential outcomes different characters could appear in.
Both The Justice Society., who will appear in Black Adam, and the Birds of Prey have featured the Sonia Sato incarnation of Judomaster, so the rendition presented in Peacemaker could appear later to set up the presentation of another Judomaster. ARGUS is a major government organization in the pages of DC Comics, and the organization could be featured in any of the impending ventures like Black Adam, The Flash, or Aquaman and the Lost Kingdom, loaning to a potential appearance by characters like Emilia Harcourt (Jennifer Holland) and John Economos (Steve Agee) who were featured in The Suicide Squad or rookies Leota Adebayo (Danielle Brooks) and Clemson Murn (Chukwudi Iwuji).
The series may have already provided some insight into a more extensive association with the DCEU. The series threat appears to be a creature that controls a human host called butterflies, named after their appearance. The brain controlling aspect of them, in addition to the bug association, indicates that this is associated with the detestable virtuoso caterpillar Mr. Mind, who was alluded to in the end credits of Shazam!. Mr Mind isn’t relied upon to appear in the impending film Shazam! Rage of the Gods, conceivably because the character is the primary villain of Peacemaker, however may be referred to by one of the characters in the impending Shazam! continuation.
According to James Gunn, a character from Peacemaker will appear in another DCEU project. The side project series to The Suicide Squad, Peacemaker, debuted its initial three episodes on HBO Max on January 14, 2022, and has earned rave surveys from pundits and audiences. Peacemaker marks the principal TV series set in the DCEU, with additional to come in the future to expand the universe and present more characters.
In addition to Peacemaker, the series has already presented Vigilante (Freddie Stroma) and Judomaster (Nhut Le) into the DCEU. The series has also blended Peacemaker’s father from the comics with the villain The White Dragon, a dark racial oppressor super villain from the comics. With five additional episodes left, it is within the realm of possibilities more characters from DC Comics and potentially other DCEU characters like individuals from The Suicide Squad could appear.