From what Jason Momoa had to say to Comic Book Movie, if you are a fan of Aquaman once he is King of the Seven Seas and has more of a grip on his destiny, you may not be a fan of the character in Justice League, or even at the beginning of the Aquaman movie.
While we didn’t officially know that Aquaman would become the King of the Seven Seas at the end of his solo movie, it makes total sense.
Plus, we previously learned that Orm, Aquaman’s half-brother, might be ruling over Atlantis during the beginning of Aquaman.
It wouldn’t be the first example of Aquaman being a little different than his comics counterpart.