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Poseidon is one of the three Ancient Weapons, alongside with Pluton and Uranus. It is a mermaid who has the power to communicate with Sea Kings. The weapon is currently manifested as Shirahoshi, the 16-year-old princess of the Ryugu Kingdom.

Appearance[edit | edit source]

Rather than being an inanimate object like usual weapons, Poseidon was a mermaid belonging to the Ryugu Kingdom's royal bloodline. After she died, her descendants who possessed the same ability to speak with Sea Kings were granted her name as a Title, known colloquially as the "Mermaid Princess" (人魚姫 Ningyo Hime?). Currently, Shirahoshi has inherited Poseidon's power and her name.

Abilities and Powers[edit | edit source]

The Sea Kings inadvertently summoned by Shirahoshi.

Poseidon has the power to communicate with and control Sea Kings, an ability that not even the most powerful merfolk possess. This is considered to be a powerful weapon because of the Sea Kings' destructive potential to sink islands with ease, and to control such a force is regarded as one of the most fearsome abilities in the entire world. When guided by the power of love, it can save thousands of lives, but with evil intentions, it can sink everything into the ocean.[2] The Sea Kings refer to the Mermaid Princess as their queen.

When the current Mermaid Princess Shirahoshi's powers first awoke at age six, she demonstrated no control over her own abilities and would inadvertently summon Sea Kings when she cried out loud, something which could put her kingdom at risk. Ten years later, during the battle against the New Fish-Man Pirates, she fully awakened her ability and seemingly gained control of it.

History[edit | edit source]

Original Poseidon[edit | edit source]

The legendary Mermaid Princess Poseidon who could command Sea Kings.

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.

Legacy[edit | edit source]

The Shandora Poneglyph, holding the secret to Poseidon.

After the Void Century, Poseidon disappeared from records, with the only information about her being found on the Shandora Poneglyph in Skypiea,[3] and the Ryugu Poneglyph located in the Sea Forest, which is written as a letter of apology from Joy Boy to Poseidon, apologizing for breaking his end of the bargain.[4]

Even after her death, her power did not die and Poseidon's ability was passed through the generations of the royal family, although never awakened. Meanwhile, Fish-Man Island attempted to keep its end of the bargain despite Joy Boy not keeping his. The World Government spent the next few centuries trying to avoid the awakening of the Ancient Weapons by outlawing the reading of the poneglyphs.

Poseidon's story became a legend within Fish-Man Island over time and stories were passed throughout the Ryugu Kingdom royal family. According to one such legend, a mermaid would be born with the ability to control the Sea Kings; on that day a man would come to guide her. The first Vander Decken traveled to Fish-Man Island to find this mermaid. However, he failed to find her and the story was passed down through his descendants as well, with each new Vander Decken trying to find the princess.

Current Poseidon[edit | edit source]

Shirahoshi summons Sea Kings to stop Noah.

Eight years before the start of the series, Princess Shirahoshi had unwittingly demonstrated the ability to summon Sea Kings when her mother was in danger of being shot by the World Noble Mjosgard. Her cries summoned a group of the sea monsters, allowing her mother and Vander Decken IX to find out about her ability. At this point, Decken deduced that Shirahoshi is the Mermaid Princess of legend that his family had been searching for and decided to marry her to gain access to her fearsome abilities (as well as her unparalleled beauty), leading him to send her threatening marriage proposals for the next ten years. Otohime, knowing that such powers can be both beneficial and deadly, had her three sons train hard to become strong warriors in order to protect Shirahoshi when the time came. Shirahoshi's power was fully awakened during the fight with the New Fish-Man Pirates, which Neptune noted was not a good thing. However, it led to the Sea Kings stopping Noah from falling on Fish-Man Island.

Indeed, when Caribou overheard Nico Robin and King Neptune discussing about Ancient Weapons and Shirahoshi as Poseidon, he swiftly tried to kidnap her for her apocalyptic power, only to be thwarted by the Straw Hat Pirates.[5]

Trivia[edit | edit source]

  • In Greek mythology, Poseidon (Ποσειδών) is the god of the sea, water, and earthquakes. This notably keeps with the sea god-theme of her parents; Neptune is the Roman equivalent of Poseidon and Otohime is the daughter of the Japanese sea-god Ryūjin.
  • Poseidon's ability is somewhat similar to the power to hear the Voice of All Things, which allows the person to understand animals, including Sea Kings.

References[edit | edit source]

  1. One Piece Manga and Anime — Vol. 62 Chapter 612 (p. 17-19) and Episode 531, Shirahoshi is finally seen for the first time.
  2. One Piece Manga and Anime — Vol. 63 Chapter 626 and Episode 546, Otohime speaks about the legend of the Mermaid Princess.
  3. One Piece Manga and Anime — Vol. 29 Chapter 272 and Episode 174, Robin reads the poneglyph at Shandora.
  4. One Piece Manga and Anime — Vol. 66 Chapter 649 and Episode 569, Neptune explains to Robin who Joy Boy was.
  5. One Piece Manga and Anime — Vol. 66 Chapter 650 and Episode 570, Caribou attempted to kidnap Shirahoshi.

Site Navigation[edit | edit source]

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Named Blades: Gryphon  •  Wado Ichimonji  •  Yamaoroshi  •  Shodai Kitetsu  •  Nidai Kitetsu  •  Sandai Kitetsu  •  Yubashiri   •  Shigure  •  Kashu  •  Yoru  •  Terry Sword  •  Eisen Whip  •  Bamboo  •  Funkfreed  •  Shusui  •  Oto and Kogarashi  •  Soul Solid  •  Durandal  •  Kikoku  •  Same-kiri Bocho  •  Pretzel  •  Shirauo  •  Raiu  •  Enma  •  Ame no Habakiri  •  Konpira  •  Shichiseiken 
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Related: Meito  •  Kitetsu  •  Swordsman
Projectile Weapons
Firearms: Flintlock  •  Flintlock .44 Caliber 6 Shot Revolver  •  Lassoo  •  Yellow Gun  •  Gero Gero Gun  •  Senriku  •  Flash Gun  •  Walker
Artillery: Royal Drum Crown 7-Shot Bliking Cannon  •  Burn Bazooka/Flame Bazooka  •  Brachio Tank V  •  King Cannon   •  Eagle Launcher   •  Alpacacino 
Slingshots: Ginga Pachinko  •  Kabuto  •  Kuro Kabuto
Ammo: Buggy Balls  •  Milky Arrow  •  Pop Green  •  KX Launcher  •  Candy Jacket  •  Excite Bullets
Others: Battle Smasher   •  Carbonation Equipment 
Other Weapons
Ancient Weapons: Pluton  •  Poseidon  •  Uranus
Non-Bladed Polearms: Nanashaku Jitte  •  Clima Tact (Perfect  •  Sorcery)  •  Nonosama Bo
Cyborgs: Cyborg Tactics/Armored Me  •  Pacifista (Shiro Kuma)  •  Kau Ra Kau   •  Zau Ra Zau 
Others: Poison (Shinokuni  •  Koro)  •  Dials  •  Explosive  •  Gorilla Puncher 13  •  Prometheus  •  Zeus  •  Raid Suit  •  General Franky (Kurosai FR-U IV  •  Brachio Tank V))  •  Roba-san Kick 18   •  Senpu King   •  Dyna Stone 
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History
Major Events: God Valley Incident  •  Battle of Edd War  •  Ohara Incident  •  Conquest of Four Nations  •  Battle of Marineford  •  New Onigashima Project
Literature: Newspaper  •  Brag Men  •  Liar Noland  •  Rainbow Mist, Volumes I to VIII   •  Devil Fruit Encyclopedia  •  Sora, Warrior of the Sea
Significant Figures
Archaeologists: Demons of Ohara (Nico Robin  •  Professor Clover  •  Nico Olvia  •  Rint  •  Zadie  •  Roche  •  Busshiri  •  Hack  •  Gram  •  Hocha)
Explorers and Pioneers: Mont Blanc Noland  •  Fisher Tiger  •  Louis Arnote  •  Jew Wall
Pirates: Rocks Pirates  •  Roger Pirates  •  Fisher Tiger  •  Vander Decken  •  Chinjao  •  Nox Pirates
Marines: Sengoku  •  Monkey D. Garp  •  Vegapunk  •  Kong
Leaders/Royalty: Monkey D. Dragon  •  Kalgara  •  Tom  •  Oars  •  Shirahoshi  •  Otohime  •  Vinsmoke Judge  •  Kozuki Oden
Misc.: Rob Lucci  •  Shimotsuki Ryuma  •  Jigoro  •  Joy Boy  •  Mousse  •  Herb  •  Seto  •  Pantri  •  Kashigami  •  Kozuki Toki
Void Century
Ancient Weapons: Pluton  •  Poseidon  •  Uranus
Artifacts: Poneglyph  •  Shandorian Golden Belfry Bell  •  Noah  •  Empty Throne
The Great War: World Government  •  Great Kingdom  •  Shandia  •  Kozuki Family
Related Articles
Story Arcs: Alabasta Arc  •  Jaya Arc  •  Skypiea Arc  •  Water 7 Arc  •  Enies Lobby Arc  •  Sabaody Archipelago Arc  •  Marineford Arc  •  Fish-Man Island Arc  •  Dressrosa Arc  •  Zou Arc  •  Wano Country Arc
Locations: Loguetown  •  Tomb of the Kings  •  Water 7  •  Ohara (Tree of Knowledge)  •  Land of Ice  •  Shandora  •  Mary Geoise  •  Laugh Tale  •  Sea Forest  •  Fish-Man District  •  Wano Country  •  Flower Capital
Others: Will of D.  •  New Age  •  World Timeline  •  Toki Toki no Mi
[v · e · ?]
Fish-Man Island
Residents
Neptune Family: Poseidon   •  Neptune  •  Otohime   •  Fukaboshi  •  Ryuboshi  •  Manboshi  •  Shirahoshi
Fish-Men: Arlong  •  Hatchan  •  Chew  •  Kuroobi  •  Pisaro  •  Kaneshiro  •  Take  •  Shioyaki  •  Octopako  •  Jinbe  •  Hammond  •  Kasagoba  •  Hody Jones  •  Fisher Tiger   •  Ammo Knights  •  Dosun  •  Zeo  •  Daruma  •  Ikaros Much  •  Harisenbon  •  Junan  •  Papaneel  •  Togare  •  Tom    •  Hack  •  Gotan   •  Nuru   •  Meverly   •  Garcia 
Merfolk: Camie  •  Kokoro   •  Hyouzou  •  Medaka Mermaid Quintuplets  •  Ishilly  •  Kairen  •  Hiramera  •  Seira  •  Mero  •  Lulis  •  Adele  •  Fillonce  •  Sora  •  Shyarly  •  Minister of the Right  •  Minister of the Left  •  Den  •  Aladine  •  Maria Napole  •  Luca 
Animals: Pappag  •  Surume  •  Megalo  •  Hoe  •  Daidalos 
Abilities
Fighting Style Based: Haki  •  Fish-Man Karate (Fish-Man Jujutsu)  •  Merman Combat  •  Merman Gujutsu
Weapon Based: Rokutoryu  •  Kiribachi  •  Hattoryu  •  Kirisame 
Others: Energy Steroid  •  Bubbly Coral  •  Voice of All Things
Related Articles
Story Arc(s): Fish-Man Island Arc  •  Whole Cake Island Arc  •  Levely Arc  •  Wano Country Arc
Cover Stories: From the Decks of the World: The 500,000,000 Man Arc
Locations: Ryugu Kingdom  •  Ryugu Palace  •  Mermaid Cove (Coral Mansion)  •  Coral Hill  •  Gyoverly Hills  •  Sea Forest  •  Fish-Man District  •  Fish-Man Karate Dojo  •  Candy Factory Town  •  Gyoncorde Plaza  •  John's Candies Shop
Ship(s): Noah  •  Ryugu
Organizations: Seven Warlords of the Sea  •  Sun Pirates  •  Arlong Pirates  •  Macro Pirates  •  New Fish-Man Pirates  •  Flying Pirates  •  Big Mom Pirates  •  Whitebeard Pirates
Others: Slavery  •  Edward Newgate  •  Charlotte Linlin  •  Tamatebako *  •  Levely
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Royalty
Titles: King  •  Queen  •  Prince  •  Princess
Royal Families: Nefertari Family  •  Gorgon Sisters  •  Neptune Family  •  Riku Family  •  Donquixote Family   •  Vinsmoke Family  •  Charlotte Family  •  Kozuki Family  •  Kurozumi Family
Levely Participants
Alabasta: Nefertari Cobra  •  Nefertari Titi   •  Nefertari Vivi
Drum/Sakura Kingdom: Dalton  •  Wapol's Father   •  Wapol 
Black Drum Kingdom: Wapol  •  Kinderella
Goa Kingdom: Sterry  •  Sarie Nantokanette
Ryugu Kingdom: Poseidon   •  Neptune  •  Otohime   •  Fukaboshi  •  Ryuboshi  •  Manboshi  •  Shirahoshi
Dressrosa: Donquixote Doflamingo   •  Riku Doldo III  •  Scarlett   •  Viola  •  Rebecca 
Germa Kingdom: Vinsmoke Judge  •  Vinsmoke Sora   •  Vinsmoke Reiju  •  Vinsmoke Ichiji  •  Vinsmoke Niji  •  Vinsmoke Sanji   •  Vinsmoke Yonji
Lulusia Kingdom: Seki  •  Komane
Roshwan Kingdom: Beer VI  •  Matryo Princesses
Others: Thalassa Lucas * *  •  Bartholomew Kuma *   •  Elizabello II *  •  Ramen *  •  Ham Burger *  •  Mororon *  •  Tacos *  •  Tea IV  •  Ban Dedessinée  •  Lemoncheese  •  Potaufeu  •  Jeep  •  Samosa
Other Royals
Skypiea: God of Skypiea   •  Gan Fall  •  Enel 
Amazon Lily: Boa Hancock  •  Boa Sandersonia  •  Boa Marigold  •  Gloriosa 
Tontatta Kingdom: Gancho  •  Mansherry
Mokomo Dukedom: Inuarashi  •  Nekomamushi  •  Hitsugisukan  *
Wano Country: Kurozumi Orochi  •  Kozuki Sukiyaki 
Others: Goldfish Princess *  •  Emporio Ivankov *  •  Charlotte Linlin *  •  Loki *  •  Cavendish *   •  Bellett   •  Avalo Pizarro 
Non-canon Royals
Crown Island: Kirin Lion   •  Mobambi
Mecha Island: Ratchet  •  Roba
Others: Atoli *  •  Musshuru *   •  Caroline * 
Related Articles
Story Arcs: Alabasta Saga (Reverse Mountain Arc  •  Whisky Peak Arc  •  Little Garden Arc  •  Drum Island Arc  •  Alabasta Arc)  •  Sky Island Saga (Jaya Arc  •  Skypiea Arc)  •  Summit War Saga (Amazon Lily  •  Impel Down  •  Marineford Arc  •  Post-War Arc)  •  Fish-Man Island Saga (Return to Sabaody Arc  •  Fish-Man Island Arc)  •  Dressrosa Saga (Punk Hazard Arc  •  Dressrosa Arc)  •  Yonko Saga (Zou Arc  •  Whole Cake Island Arc  •  Levely Arc)
Cover Stories: Hatchan's Sea-Floor Stroll  •  Wapol's Omnivorous Hurrah  •  From the Decks of the World  •  From the Decks of the World: The 500,000,000 Man Arc  •  The Stories of the Self-Proclaimed Straw Hat Grand Fleet
Terms: Kingdoms  •  Levely  •  World Government  •  Void Century  •  Royal Guards
[v · e · ?]
Merfolk
Royalty: Poseidon   •  Neptune  •  Otohime   •  Shirahoshi  •  Fukaboshi  •  Ryuboshi  •  Manboshi
Civilians: Minister of the Left  •  Minister of the Right  •  Kokoro  •  Camie  •  Shyarly  •  Medaka Mermaid Quintuplets  •  Ishilly  •  Kairen  •  Hiramera  •  Seira  •  Mero  •  Lulis  •  Adele  •  Fillonce  •  Sora  •  Den  •  Maria Napole  •  Luca 
Pirates: Hyouzou  •  Aladine
Hybrids: Chimney *  •  Charlotte Praline *  •  Charlotte Prim *
Related Articles
Organizations: Tom's Workers  •  Takoyaki 8  •  Sun Pirates  •  Neptune Family  •  New Fish-Man Pirates  •  Big Mom Pirates (Charlotte Family)
Locations: Water 7  •  Fish-Man Island  •  Totto Land
Story Arcs: Arlong Park Arc  •  Water 7 Arc  •  Enies Lobby Arc  •  Post-Enies Lobby Arc  •  Sabaody Archipelago Arc  •  Fish-Man Island Arc  •  Dressrosa Arc  •  Whole Cake Island Arc  •  Levely Arc  •  Wano Country Arc
Cover Stories: Hatchan's Sea-Floor Stroll  •  Caribou's Kehihihihi in the New World  •  Solo Journey of Jinbe, Knight of the Sea  •  From the Decks of the World: The 500,000,000 Man Arc
Other: Fish-Men
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