The producer of the DC film universe.
Dwayne Johnson has reportedly been ecstatic about his Black Adam's reveal until a little bit later and will reportedly make him into more of an anti-hero and less of a literal villain.
Now, fans know there is at least a small chance of Superman returning to the DCEU, thanks to statements made by Black Adam's producer Hiram Garcia to ComicBook's Brandon Davis and reported on by CBR. During a recent interview, Garcia spoke about his film and discussed briefly the concept of Henry Cavill returning to reprise his role as the Kryptonian hero. "The DC Universe is a wonderful universe and we're open to everything," he said. "We're friends with Henry."
Although likely speaking of the film's director Jaume Collet-Serra and others involved with the movie, Garcia went on to imply The Rock himself was also friends with invite to the Batcave firmly in hand, it seems like there isn't any superhero in the DC pantheon who isn't excited to be working with Black Adam's Dwayne Johnson.
It's already been confirmed Snyder Cut of Justice League and Man of Steel would surely be excited to see Cavill don the spandex opposite Dwayne Johnson in Black Adam.