His name is mostly likely an alias based on his obsessed with the classical pirates. He is greedy, but he would put his children first. If need be, he'll reluctantly work alongside the Nekton Family if is kids are at risk. He loves his daughter and spoils her rotten. He is obsessed with William Nekton's artifacts, believing that they will lead to vast treasure.
So far, Captain Hammerhead only appears on the animated series. Captain Hammerhead is voiced by Michael Dobson (who also voices William Nekton).