Poseidon

Poseidon (ポセイドン) is another of the ancient weapons with intentions like that of Pluton.

Appearance
Poseidon has no true form. Instead, the power manifests itself into a mermaid belonging to the Ryugu Kingdom's royal bloodline. It currently takes the form of Shirahoshi.

Abilities and Powers
Poseidon had the power to communicate with and control Sea Kings. That power was considered a weapon because Sea Kings can tear islands apart and sink them into the ocean, meaning whoever can control their power is a threat to the world.

History
Poseidon lived during the Void century and made a bargain with Joy Boy. She would use her powers to command the Sea Kings to bring Noah to the surface of the world and activate its intended mission of which the details would be revealed when raised. However, Joy Boy failed in his commitment to Poseidon. On the Ryugu Poneglyph located in Sea Forest is a letter of apology from Joy Boy to the mermaid princess, Poseidon apologizing for breaking his end of the bargain.

Even after her death, the "weapon" did not die and Poseidon's abilities were passed through the generations of the royal family, although never awakened. Meanwhile, Fishman Island attempted to keep its end of the bargain despite Joy Boy breaking his. The World Government spent the next few centuries trying to avoid the awaking of the Ancient Weapons by outlawing the reading of the Poneglyphs. However, despite their efforts the Poseidon's powers resurfaced in the form of Shirahoshi the daughter of Neptune.

Trivia

 * In Greek mythology, Poseidon (Ποσειδών) is the god of the sea, water and earthquakes. This notably keeps in theme with the rest of the Ryugu Kingdom royal family; Neptune is named after the God from Roman mythology of the same name and Otohime, who is named after the daughter of the Japanese sea god Ryūjin.

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Poseidon