The One Piece community has been absolutely losing it over a wild new theory about two unsuspecting characters: Princess Shirahoshi and Accursed Prince Loki. At first glance, their two stories don’t seem to have much in common at all. Shirahoshi’s a sweet and kind mermaid princess who cries whenever anything happens, while Loki is a world-threatening giant.
But various chapters have been sprinkling clues that these two may, in fact, know each other. And if this theory is true, it could shake up everything we thought we knew about both characters.
The Mystery of Mosa in One Piece

The biggest clue comes from Loki's mysterious friend called "Mosa." Throughout the Elbaph arc in One Piece, Loki has been talking to someone through a Den Den Mushi. This friend seems to be the only person who genuinely cares about him. Mosa speaks softly and timidly, doesn't like being yelled at, and recently went through something traumatic. Sound familiar? That is basically Shirahoshi's entire personality.
Mosa talks almost the same way Shirahoshi does in One Piece. When Luffy first met Shirahoshi, she cried right away because he yelled. Mosa does the same thing when Loki speaks loudly. Both of them are very soft-hearted and get scared easily. Their way of talking is so similar that it doesn’t feel like an accident.
The Traumatic Incident at the Levely

Mosa mentioned going through a terrible ordeal. Fans will remember what happened to Shirahoshi at the Levely. She was nearly enslaved by the Celestial Dragon Charlos not once, but twice. The second time, people saw her riding on Bartholomew Kuma’s back before she was saved. Something like that would stay with anyone, especially someone as sensitive as Shirahoshi.
When Loki found out what happened to Mosa, he got very angry and said he would have beaten all of them if he had been there. That protective anger makes sense if Mosa really is Shirahoshi. The Ancient Weapon Poseidon getting captured by the World Government would be a massive deal in One Piece. And Loki's reaction suggests he understands how serious the situation was.
Why This Connection Makes More Sense?

If Shirahoshi is indeed Mosa, that would be massive for One Piece. Shirahoshi can communicate with Sea Kings and is classified as one of the Ancient Weapons. But she doesn’t quite know what to do with her powers yet. Loki, meanwhile, is seeking power and says he wants to bring on the apocalypse.
The theory becomes more intriguing when you delve into their pasts. Both Shirahoshi and Loki have been isolated for years in One Piece. She was locked in Hard-Shell Tower for a decade because of Vander Decken IX. He has been chained up in Elbaph's Underworld for six years. That kind of loneliness would make them natural friends, even if they've never actually met in person.
There is also the detail about the Den Den Mushi itself. It is a Snow Den Den Mushi, which has a hairy appearance that could easily be mistaken for an old person's snail. This explains why some One Piece fans initially thought Mosa might be Elder Jarul instead of Shirahoshi.
The Arranged Marriage Angle

Here's where things get really wild. King Harald was known for trying to change Elbaph's culture and break away from their old traditions. He himself was forced into a marriage based on pure bloodlines, which he clearly hated. Some fans theorize he might have arranged for Loki to marry someone outside their race, just like he wanted to marry Ida. Shirahoshi would actually make sense as a political match in the world of One Piece. Both are royalty from powerful kingdoms. Both are connected to ancient powers.
But here is the thing. They probably don't even know each other's real identities. Loki calls his friend Mosa, and Shirahoshi likely has no idea she's talking to the dangerous prince of Elbaph. They just bonded as two lonely people who understood each other's pain in One Piece.
The chapter where Mosa tells Loki they need to cut contact lines up perfectly with the chaos at the Levely. After everything Shirahoshi went through with the Celestial Dragons and learning about Vegapunk's message, she would have good reason to go silent. She is probably dealing with way too much right now.
Conclusion
Whether this theory proves true or not, it shows how brilliantly Oda connects characters across the massive world of One Piece. And if Shirahoshi and Loki do team up eventually, the final war is going to be absolutely insane.