Know the killer of his mother
Otohime died after getting shot, even so no one knows who the person who attacked Otohime besides Shirahoshi, but Shirahoshi prefers to remain silent because of the promise she had with her mother
Brooks view
When the Straw Hat Pirates came to the Ryugu kingdom, and told them about Shirahoshi, Brook had an image that was far from reality about Shirahoshi after hearing the fact that Shirahoshi was big.
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Vander Dacken
Vander Dacken really wants to marry Shirahoshi because he knows Shirahoshi's nickname which is Poseidon, and after marking Shirahoshi with his hand, Vander Dacken always uses gloves so the signature on his hand doesn't get lost.
Caribou
Caribou is one of the people who knows about Shirahoshi's nickname as Poseidon, because of this he had wanted to catch Shirahoshi but failed to even be thrown out after meeting Luffy.
Shirahoshi's photo
When Im Sama appeared, there were several photos that were brought by him and may have become his target or attention. And one of the photos that brought Im together was Shirahoshi, apart from that there were also several photos of important figures like Teach, Luffy, and also Vivi.
Like Rebecca
If you pay attention, there are some similarities between Shirahoshi and Rebecca, including that they are both 16 years old and related to the kingdom, their mothers are both needed by the enemies of their kingdom. And the hair of these two people both look pink.
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Ancient Weapons
There are 3 ancient weapons that are very feared by the world government, one of which is Poseidon which is the nickname of Shirahoshi. Interestingly, even though Shirahoshi is called a weapon, she is actually a mermaid, aka a living creature, and is different from Pluton, which is said to be a warship.
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