The comic book version of Karshon may sound familiar to DC film fans, especially taking into consideration his membership at one point in the Suicide Squad. It’s worth noting, however, that the giant shark in the 2021 “Suicide Squad” film portrayed by Sylvester Stallone is named King Shark and is distinct from Karshon.
Furthermore, whereas King Shark is simply a large shark-man, Karshon possesses psychic powers in addition to his slate of shark-adjacent abilities. It’s most likely due to this characteristic, then, that it’s possible for Wan to do away with their typical sharklike look while maintaining their identity. That said, the character most frequently shows up in Green Lantern comics and antagonizes Hal Jordan, whom Karshon’s predatory instincts have determined to be his ideal prey. How they will relate to Aquaman in “The Lost Kingdom” will therefore introduce a new facet to the character.
Since the canonicity of “The Lost Kingdom” is murky, it’s unclear whether or not Indya Moore’s Karshon can persist in future DC projects centering their traditional foe in The Green Lantern. Nevertheless, their addition to the DCU makes this notion a distinct possibility.