The 52DCU Aquaman is quite different than most depictions. He was a lowly Gothamite when his Atlantean DNA started to manifest meta-human powers in him. He's too unfamiliar with the Atlantian world, and too much of an over-powered hero to fit in with regular joes. *He also has a chant/ calming phrase he learned from Batman*

(He is [obviously] a main character in Aquaman v. Wonder Woman and Aquaman Origins)