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The Neptune Family[2] is the royal bloodline that rules the Ryugu Kingdom of Fish-Man Island.


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Neptune Family
Neptune Otohime  Fukaboshi Ryuboshi Manboshi
Shirahoshi Poseidon 
Hoe Megalo

Neptune Army

The Neptune Army is an army in service of the family led by the Neptune Brothers (i.e. Fukaboshi, Ryuboshi and Manboshi).[2] It's mostly made of Ammo Knights.[3]



Void Century

Princess Poseidon lived during the Void Century and made a pact with Joy Boy. She would use her powers to command the Sea Kings to bring Noah to the surface and activate its intended mission, for which the details would be revealed when raised. However, Joy Boy failed in his commitment to Poseidon due to unknown reasons.[4]

Otohime's Hope

After five years, a giant wrecked ship carrying a World Noble arrived at the Fish-Man Island's main entrance and the ship was in need of an emergency entrance. Otohime then rushed to the scene.[5] The ship was owned by Donquixote Mjosgard, who traveled to Fish-Man Island to retrieve his slaves, who were by that point the former members of the Sun Pirates. Otohime arrived just in time to save the noble from a fired bullet, getting grazed in the arm in the process. Some weeks later, Mjosgard was healed and allowed to leave (albeit very ungrateful for their mercy). Otohime decided to go with him much to the shock and disapproval of her subjects and family. She asked them to trust her and humanity, which everyone reluctantly complied with. After one week, she returned to the island having somehow negotiated with the World Nobles and holding a paper said to be "The Hope of Fish-Man Island".[6]

Otohime continues to hope.

One day in Gyoncorde Plaza, the box holding all the collected signatures suddenly caught fire. In the ensuing confusion, Otohime was shot. Amidst the chaos, Vander Decken IX marked Shirahoshi with his Mato Mato no Mi powers. Shirahoshi, who was stunned seeing her mother get shot, did not noticed his presence. As she fell to the ground, her sons immediately came to her side. Fukaboshi swore revenge, but Otohime told him not to be angry for her. Otohime reminded her sons about their promise to protect Shirahoshi.[7]

Fish-Man Island Saga

Fish-Man Island Arc

After the Straw Hats arrived at Fish-Man Island, Fukaboshi, Ryuboshi, and Manboshi searched for them, wanting to pass on a message from Jinbe.[1]

King Neptune later invited Luffy and the Straw Hats to his palace.[8] In the palace, Luffy met Shirahoshi, who explained that she had been staying in Hard-Shell Tower for ten years because Vander Decken IX possesses some kind of "curse".[9] Meanwhile, Neptune heard about Shyarly's prediction and mysterious mermaid kidnappings. The king and the palace guards tried to capture the Straw Hats only to be defeated and tied up. The princes returned to the palace, but they were locked out. Zoro listed his demands and Fukaboshi gave him Jinbe's message.[10] After Luffy took Shirahoshi out of the palace, Hody Jones, Decken, and their crews entered the palace much to the surprise of Neptune. Hody and his crew then invaded the palace and captured Neptune in the ensuing conflict.[11]

Meanwhile, Luffy and Shirahoshi were confronted by Decken at Coral Hill, where the princess rejected Decken's proposal. After defeating Decken, Luffy took Shirahoshi to the Sea Forest, where they met Jinbe.[12]

Neptune and his sons all chained up and on display for execution.

Hody later brought Neptune to Gyoncorde Plaza, where he planned to execute him.[13] The princes arrived and confronted the officers of Hody's crew only to be defeated and captured as well. After seemingly falling for a trap, Shirahoshi, Jinbe, and Megalo were also taken to the plaza.[14] Right after Luffy saved Neptune from execution, the Straw Hats quickly freed the king and the princes and Hoe took them to safety.[15] The princes later returned to fight Hody.[16] Once the New Fish-Man Pirates were defeated, the royal family celebrated the victory.[17] The moment the Straw Hat Pirates left, they made to Shirahoshi the promise to meet again.[18]

Four Emperors Saga

Zou Arc

As the time for Levely approached, Shirahoshi was asked to accompany her father and brothers. Shirahoshi initially refused, saying that she was too scared and not wanting to break her promise to Luffy. Fukaboshi told her that she should come for their mother's sake.[19]

Levely Arc

The Neptune Family arrives at the Red Port, escorted by Garp.

As the news of Luffy's exploits at Totto Land spread across the world, Neptune read about it on the newspaper and learned that Jinbe joined Luffy's crew. Given Jinbe's actions against Big Mom, Neptune planned to declare Fish-Man Island under the Straw Hats' protection. As Shirahoshi decided to accompany her family, they were ready to depart for the Levely.[20]

Later, they arrived at the Red Port, where they made acquaintances with Monkey D. Garp as he escorted them to the bondola. Along the way, Neptune interrupted a quarrel between Garp and Sterry. Neptune and Garp then parted at the bondola, and as he and his family rode it to Mary Geoise, Neptune was happy that Shirahoshi marveled at the sun and sky.[21]

At the socializing plaza, several royals tried to get Shirahoshi's attention and she was overwhelmed as she accidentally offended them. She then befriended Vivi and Rebecca after hearing them talk about Luffy, even though Ryuboshi tried not to associate his sister with a pirate. Meanwhile, Fukaboshi conversed with Viola.[22]

Later, Charlos tried to take Shirahoshi by force. Before Neptune did anything drastic, Mjosgard intervened on Shirahoshi's behalf and knocked out Charlos with a spiked club before ordering for Shirahoshi to be set free.[23] After Charlos was taken away, Mansherry healed Shirahoshi's bruises, and Neptune acknowledged that there are good humans and that Mjosgard's actions had saved Otohime's dream.[24] Neptune later went to the conference room with the other kings and queens to begin the Levely.[25]

Wano Country Arc

After returning home with Garp, the family thanked the Marine and offered him to rest before departing. They then talked about the outcome of the Levely, and about an incident involving Arabasta.[26]


  1. 1.0 1.1 One Piece Manga and Anime — Vol. 62 Chapter 609 (p. 7-19) and Episode 528, Fukaboshi, Ryuboshi and Manboshi make their debut.
  2. 2.0 2.1 One Piece Manga and Anime — Vol. 62 Chapter 609 (p. 7-8) and Episode 528, The sons of the family are referred as "Neptune Brothers".
  3. One Piece Manga and Anime — Vol. 62 Chapter 609 (p. 11) and Episode 528, Neptune Army is seen.
  4. One Piece Manga and Anime — Vol. 66 Chapter 649 (p. 16-19) and Episode 569, Neptune and Robin talk about Joy Boy and Poseidon.
  5. One Piece Manga and Anime — Vol. 63 Chapter 624 (p. 17) and Episode 545, Otohime rushes to the wreaked Celestial ship.
  6. One Piece Manga and Anime — Vol. 63 Chapter 625 and Episodes 545546, Otohime goal is reached.
  7. One Piece Manga and Anime — Vol. 63 Chapter 626 (p. 12-19) and Episode 546, Otohime is killed.
  8. One Piece Manga and Anime — Vol. 62 Chapter 611 (p. 11) and Episode 530, Neptune approch the Straw Hats.
  9. One Piece Manga and Anime — Vol. 62 Chapter 613 (p. 4-12) and Episode 532, Luffy met Shirahoshi.
  10. One Piece Manga and Anime — Vol. 62 Chapters 613614 (p. 8, 13-15, 2-8) and Episodes 532533, The Straw hats takes over Ryugu Palace.
  11. One Piece Manga and Anime — Vol. 6263 Chapters 614616 (p. 11-17, 2-4, 15-16, 8-9, 14-16) and Episodes 533535, Ryugu Palace in turmoil.
  12. One Piece Manga and Anime — Vol. 63 Chapters 618619 (p. 5-15, 11-17) and Episodes 537538, Luffy goes to the Sea Forest.
  13. One Piece Manga and Anime — Vol. 64 Chapter 628 (p. 8-9) and Episode 548, Hody broadcast his plans o Fish-Man Island.
  14. One Piece Manga and Anime — Vol. 64 Chapters 631632 (p. 13-19, 2-7) and Episodes 551552, The New Fish-Man Pirates capture the Neptune Family.
  15. One Piece Manga and Anime — Vol. 64 Chapter 633 (p. 10-17) and Episode 553, The Straw Hats save the Neptune Family.
  16. One Piece Manga and Anime — Vol. 65 Chapter 638 (p. 13-17) and Episode 559, The Neptune Brothers rejoin the fight.
  17. One Piece Manga and Anime — Vol. 66 Chapter 649 (p. 15) and Episode 569, The win against the New Fish-Man Pirates is celebrated.
  18. One Piece Manga and Anime — Vol. 66 Chapter 653 (p. 10-14) and Episode 573, The Straw Hats leave Fish-Man Island.
  19. One Piece Manga and Anime — Vol. 82 Chapter 823 (p. 10-11) and Episode 777, The Neptune Family prepare for the Levely.
  20. One Piece Manga and Anime — Vol. 90 Chapter 903 (p. 6) and Episode 878, The Neptune Family head toward the Levely.
  21. One Piece Manga and Anime — Vol. 90 Chapter 905 (p. 7-14) and Episode 883, The Neptune Family arrive to the Red Port.
  22. One Piece Manga and Anime — Vol. 90 Chapter 906 (p. 2-11) and Episode 884, The Princesses bond.
  23. One Piece Manga and Anime — Vol. 90 Chapter 907 (p. 9-17) and Episode 886, Charlos trues to take Shirahoshi.
  24. One Piece Manga and Anime — Vol. 90 Chapter 908 (p. 2-3) and Episode 888, Shirahoshi is treated by Mansherry.
  25. One Piece Manga and Anime — Vol. 90 Chapter 908 (p. 10-13) and Episode 888, The Levely begins.
  26. One Piece Manga and Anime — Vol. 95 Chapter 956 (p. 2-4) and Episode 957, The Neptune Family returns home.

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