A little Mermaid Manga courtesy of the One Piece Wiki
Shirahoshi is a giant-sized mermaid, approximately the size of her pet Megalo, and is described as “cute but huge” in her introduction; this makes her roughly eight to ten times the size of Luffy, an average human, excluding the length of her tail; she can hold and hide Luffy in one hand alone.According to Caribou’s estimation, he put her about seven to eight times the size of a human-sized mermaid. Even as a baby, she was larger than her mother and brothers.
She has very long, flowing pink hair with a fish-shaped hairgrip. Her breasts are large, even relative to her giant-like size, and much of her upper body is exposed. Her broadly striped tail ends in a ruffle around her waist. She tends to have blush marks on her cheeks due to her shyness.
She wears a cleavage baring yellow halter top covered in pearls with a strap that widens and sticks out on the back of her neck. She also wears clam earrings and belly chains with a cloth hanging down in front. She has a very long light red and pink striped tail.
Despite her size, Shirahoshi is rather easily frightened. She has a very fragile personality, quickly breaking out into crying fits whenever she gets upset, such as the time when Megalo disappears, when Luffy startled her during their first meeting, and when Luffy says that he does not like her. She is somewhat spoiled, as she claimed that nobody ever yelled at her before, and cried at the fact that Luffy was the first to do so.Whenever someone yells at her, she will interpret this as anger towards her and will start crying, while saying that the offender is scary. In fact, Shirahoshi easily tears up whenever she expresses her emotions such as joy, fear, or sadness.
Regardless of her fragile personality, she is sweet and innocent like a child which is evident when she promised to return to the castle by dinner time after leaving her tower. Even though not telling everyone about Hody was a mistake, this shows that Shirahoshi has a strong and gentle spirit since not hating her mother’s killer (even though it’s her mother’s last wish) would be impossible for most people. When Decken nearly destroys Fishman Island with Noah, Shirahoshi shows her bravery for the first time, putting the lives of her people ahead of her own.
When the Straw Hats leave Fishman Island, Shirahoshi shows a determination to change, promising Luffy that she will stop being a crybaby.
Abilities and Powers
As the Mermaid Princess and King Neptune’s daughter, Shirahoshi has some level of authority over the kingdom her family rules, however it is unknown how much level of influence she has overall. It was stated by the Minister of the Right that her sudden disappearance from the Ryugu Palace could potentially trigger a nation-wide crisis.
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.
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