Fukaboshi is a shark merman and the eldest son of the royal Neptune Family on Fish-Man Island, in the anime One Piece. He is an enormous, muscular shark merman, with a wide chest and large arms. He has a long face, framed by wavy fair blue hair flowing down to his shoulders, a sharp and pointy nose, and a dot of some sort printed on the middle of his forehead. He has gills on his massive neck (although they may just be stripes) and a dark blue tail with light blue polka-dots. He wears a dark garment around his waist, held up by an extremely long sash. He also dons a light blue long band, which passes over his shoulders, drawing a circle around the back of his neck, and falls down to his waist, seemingly floating behind him; something all of the three brothers sport, as well as their mother and sister in a fashion, quite possibly implying it is a sign of the Royal Family. As a prince of the Ryugu Kingdom, he has a great deal of authority in the country. As the eldest of his siblings, he is the next in line for the throne.

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