Sapi

Sapi was the fish salesman who sold Sanji the Elephant Tuna Fish. He is half fishman and half human. He has a small ponytail that resembles a fish fin.

In the anime, he met with Sanji, but did not sell him the fish. Instead, he told him about the competition with the Elephant Tuna Fish as the prize.

Trivia

 * He is currently the only known person to be a cross species of a fishman and a human.