Ryuboshi

Ryuboshi is an oarfish merman and the second son of the royal Neptune family on Fishman Island.

Appearance
He is a tall merman, with wide eyes and long wavy hair. His shirt has very large sleeves that stop at his wrists. He carries a katana with him, though it is not clear where exactly on his person he carries it.

Personality
Ryuboshi is very upbeat and jovial. He has a habit of ending his sentences by singing part of a musical scale, such as "so-la-si-do". However, he can be serious if the situation calls for it, such as when Luffy was beating up the New Fishman Pirates, he started to draw his katana, should his involvement become necessary. He and his younger brother Manboshi apparently like to dance, as he suggested it to him while Fukaboshi was asking the mermaids about the Strawhats.

Abilities and Powers
As a prince, he has some royal authority over Fishman Island. He carries a katana with him. It is presumed he is at least somewhat proficient in using it. Hammond refered to Ryuboshi and his brothers as three of the most powerful people in the Neptune army, implying he has great fighting prowess.

History
He first appears in Mermaid Cove along with his brothers Fukaboshi and Manboshi, looking for Luffy because of his illegal entry. The mermaids hid the crew but Sanji has a massive nosebleed and blew their cover. After Keimi, Luffy, Usopp, Sanji, and Chopper escape on the royal gondola that the three brothers of the Neptune House was riding on, Ryuboshi explained with his older brother that they were looking for the Strawhats for a reason other than their illegal entry. They had to give them a message from Jinbe.