Vivi was introduced in the Arabasta Saga of One Piece. She is the princess of the Arabasta Kingdom, one of the 20 allied nations that participated in the formation of the World Government.
This should have made them Celestial Dragons, but the royal family refused to live in Mariejois and continued to rule Arabasta out of love for their kingdom.
However, the Egghead arc of the Final Saga reveals that the ruler of Arabasta during the Void Century was considered a traitor, for scattering the Poneglyphs across the world. The Nefertari family also has the mysterious D. in their name.
Furthermore, Imu is obsessed with Vivi, and he also hangs a large portrait of Queen Lily in Pangea Castle. However, fans don't know what this person wants from Vivi.
The theory that Vivi is an ancient weapon has been circulating for some time. After all, anyone with an ancient weapon can change the course of the great war.
In One Piece chapter 1121, when Vegapunk mentions the ancient weapon, we see a picture of Vivi and Shirahoshi together. This picture is larger than the others and the fact that Oda decided to show Vivi next to Shirahoshi suggests that there is more to it than meets the eye. Because the mermaid princess Shirahoshi has inherited the power of the ancient living weapon – Poseidon, which has the ability to command the Sea Kings.
A fan commented: “I'm starting to think that Vivi is also an ancient weapon, and if not, she can control them. Oda put a lot of effort into showing her reaction to Vegapunk's message in each chapter.”
“I don't believe this is just a coincidence. Especially since Shirahoshi is Poseidon. What is Oda cooking with Vivi?”another commented.