I was reading a collection of Hawaiian folk tales, and stumbled upon a great and horrific one about Nanaue, the Shark-Man.
Nanaue is the son of a human female and the Shark King.
There is a DC villain of the same name, but he is a full-blown humanoid shark, which, frankly, I find less horrifying, than the shark mouth grafted onto an otherwise normal human body, and who only occasionally turns into a shark.
Nanaue is the son of a human female and the Shark King.
"...a fine healthy boy, apparently the same as any other child, but he had, besides the normal mouth of a human being, a shark's mouth on his back between the shoulder blades."
There is a DC villain of the same name, but he is a full-blown humanoid shark, which, frankly, I find less horrifying, than the shark mouth grafted onto an otherwise normal human body, and who only occasionally turns into a shark.