Pretty amazing that a character like King Shark has had such a wide variety of great interpretations.
Nanaue aka King Shark is the son of Lord Chondrakha, the "god of all sharks". First appeared as a Superboy villain in 1994. Then made sporadic and not very memorable appearances throughout the DCU for a number of years.
Not much was done with King until Gail Simone added him to her Secret Six roster. She fleshed out his character and is a big reason why the he's had such a resurgence.
Comedian Ron Funches voices King Shark on the Harley Quinn animated series.
Than of course Sylvestor Stallone voiced him in James Gunn's The Suicide Squad.
King Shark will be a playable character in the upcoming Suicide Squad: Kill the Justice League video game.