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

What are Shirahoshi powers?

Abilities and Powers

Being a giant-sized mermaid, Shirahoshi is able to easily lift a normal-sized person with one hand, as she had done with Luffy and Nami. Like all mermaids, she is one of the fastest swimmers in the ocean.

Does Shirahoshi have a crush on Luffy?

Both Rebecca and Shirahoshi have intense adoration for Luffy that has yet to be shown to be romantic. Shirahoshi adored Luffy as her protector whilst he was on fish-man island and was distraught when he decided to leave.