Ryuboshi

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

Appearance
He is a giant tall merman (shown when he chat with Madam Shirley), with wide eyes and long wavy hair.

The sleeves of his shirt are puffed at the shoulders and 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". He and his younger brother Manboshi apparently like to dance, as he suggested it to him while Fukaboshi was asking the mermaids about the Straw Hat Pirates.

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 have become necessary.

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 referred to Ryuboshi and his brothers as three of the most powerful people in the Neptune army, implying he has great fighting prowess. The Minister of the Right claimed that the Straw Hats would be in trouble if they are confronted by Ryuboshi and his brothers.

Childhood
As a child, he would look after Shirahoshi with his brothers whenever their mother, Otohime was away preaching to the people of Fishman Island.

When Shirahoshi was six-years-old, a World Noble arrived on the island in a wrecked ship. Otohime quickly dashed off to where the ship was docked. The four children of the royal family soon followed her.

When Otohime was threatened by the noble she was protecting, Shirahoshi cried and unknowingly called out Sea Kings. The World Noble passed out from a big shock and Ryuboshi and his brothers tried to calm Shirahoshi.

When Otohime decided to accompany the noble to the surface, Ryuboshi and his siblings looked worried. For one week, they anxiously waiting in the castle for her return.

Fishman Island Arc
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 escaped on the royal gondola that the three princes were riding on, Ryuboshi explained with his older brother that they were looking for the Straw Hat Pirates for a reason other than their illegal entry. They had to give them a message from Jinbe.

He is later seen in Coral Hill, along with his brothers, looking concerned about Madame Shirley's prediction.

He is then seen outside the palace bubble, waiting to be let in. He is shocked when he realizes that the Straw Hat Pirates caused some kind of incident in the palace.

Trivia

 * His name comes from Ryūgū-no-tsukai (リュウグウノツカイ), oarfish.

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