I've always felt that King Shark is a deeply underrated DC supervillain. After a very tangled origin story that (I think) establishes him as the son of a Shark God and sets him up as an enemy for Superboy, he eventually settled into a comfortable life as a C-grade brawler with a neat gimmick who occasionally joined supervillain teams like the Secret Six and the Suicide Squad. These days, the character's probably most well known for his appearances on CW's The Flash, where he was voiced by Solid Snake himself, David Hayter.