Fukaboshi

Fukaboshi is a shark merman and also the first son of the royal Neptune family on Fishman Island.

Appearance
He is a muscular merman with a round torso and a polka dot tail with a dark garment around his waist and a sash. He has long wavy hair and a dot of some kind on his forehead. He always seems serious. He carries a trident with him.

Personality
He appears to be protective of his country, as he himself went to look for the crew who had entered the island illegally instead of just sending his guards. He has a very serious demeanor, but is also polite, as he apologized for bothering the mermaids when he was about to leave the cove. He also seems knowledgeable of at least Luffy's abilities, as he was not surprised when he used Haki on a sea monster.

Abilities and Powers
As the first son, he is by tradition the next one in line to take the throne should the current king die or otherwise abdicate his duties. As a prince, he has some authority in the country. He carries a trident, and is presumably efficient at using it. Hammond referred to Fukaboshi and his brothers as the three strongest in the Neptune Army, implying he has great physical strength. He also appears to be familiar with Haki, as he was not surprised when Luffy tamed one of the New Fishman Pirates' beasts, and commented that it was expected.

History
He first appears in Mermaid Cove with his brothers Ryuboshi and Manboshi,and appears to be looking for Luffy and his crew because of their illegal entry. The mermaids deny seeing any intruders. As Fukaboshi and his brothers are leaving, Sanji suffers a massive nosebleed resulting in critical blood loss. Luffy, Usopp, and Chopper then reveal themselves to Fukaboshi, begging anyone for a blood donation to save Sanji's life. Hammond and his group appear and attempt to capture the four Strawhat Pirates. Fukaboshi witnesses Luffy's strength as the Strawhat captain punches the New Fishman Pirates and stops their sea monster with Haki. He remains in Mermaid Cove after Keimi stole the gondola he was riding on to help Sanji, Luffy, Usopp, and Chopper escape. After the Strawhat Pirates left, Fukaboshi questions the mermaids on why they were hiding the Strawhat Pirates and reveals that he was about to give them a message from Jinbe.

Trivia

 * His name comes from Fuka (鱶), another word for shark.
 * He could be modeled after Triton, the son of Neptune, god of the sea, but it has not been confirmed by Oda.