The following contains spoilers for One Piece Chapter 1085, "The Death of Nefeltari Cobra," by Eiichiro Oda, Stephen Paul and Vanessa Satone, available in English from Viz Media.
After decades of serialization, One Piece is finally doing one reveal after another heading into its final saga. The recent Reverie is the perfect excuse to answer many longstanding mysteries -- and one of them is related to a fan-favorite character, Nefertari Vivi. However, this truth also puts her in danger as the World Government seems set to begin targeting her.
Vivi joined the Straw Hat Pirates' expedition so early on that many of the current crew haven't even met her. She has a particular relationship with them as well. Despite her refusal to join their quest, Luffy and the others have declared her to be their nakama (or comrade) and made certain she is aware of this. Needless to say, the Straw Hats will unquestionably allow her to board the Thousand Sunny the instant she displays an interest. But, rather than rejoining them, Vivi is more likely to join the Revolutionary Army in the future.
Vivi Will Likely Be a World Government Target
Chapter 1085 of One Piece continued Sabo's report to Dragon and Ivankov. The Revolutionary Army's second-in-command told the two higher-ups what he discovered inside the Pangea Castle, including how King Cobra met his demise. It started with the Alabasta king's audience with the Five Elders, where he inquired about his ancestor Nefertari Lily and the lack of written records about her existence. In fact, the only evidence he has of it is a written letter penned by the ancient monarch that's been handed down from one king to the next.
This is the same letter that caused Imu to appear in front of Cobra and resulted in the monarch's death. Cobra, however, did not die in vain and disclosed that Lily's full name is actually Nefertari D. Lily, forcing Imu to terminate him. Sabo intervened to save the king, and Cobra used the chance to convey a message to both Vivi and Luffy. He wanted Sabo to inform Vivi that she, too, has the enigmatic "D" initial.
Meanwhile, Vivi escaped from CP0's clutches with the help of the frightened Wapol. It's likely that she also used Wapol to escape from Marijoa, which will result in her being targeted by the World Government.
Vivi Would Have a Hard Time Keeping Up With the Straw Hats
Prior to Sabo's recollection of the events, Vivi was shown flying together with Morgans -- the president of the World Economy News Paper. With the princess surely being targeted by the World Government, the question is what steps she will take to avoid them. There is always the option of rejoining Luffy and the Straw Hats in their voyage, though Vivi may no longer fit in with the crew -- and could even be a liability during the upcoming war.
While brave and dedicated, Vivi lacks the physical power and battle abilities possessed by the rest of the Straw Hats. Luffy and his crew have received countless power-ups, sharpening their skills and unlocking new powers in order to confront increasingly powerful opponents. Given that the "Alabasta" arc was one of the first in One Piece, the current Straw Hat Pirates have gotten significantly stronger since then. Even Nami, who is likely the weakest member of the crew, now possesses Zeus. Vivi, on the other hand, has mainly had quiet days as Alabasta's crown princess.
Vivi must also consider her status. She holds great responsibilities and obligations as the princess of Alabasta and the leader of her people. Her principal concern is the well-being and prosperity of her realm. Joining the Straw Hat Pirates would compel her to abandon her people, which she has previously rejected. Given these considerations, it is clear that Vivi's function as a Straw Hat member would be incompatible with her current abilities, responsibilities, and limits.
Vivi Can Affiliate Alabasta With the Revolutionary Army
As King Cobra is no more, Vivi's position now holds a heavier bearing in One Piece. As the rightful heir to the throne, she is officially Alabasta's queen, though she is yet to be formally acknowledged as such. Nonetheless, it will be up to her to lead her people. Although the World Government can't openly hunt her without a valid reason, the fact that she possesses the "D" initial makes it impossible for them to ignore her existence. Even if they were to leave her be, she can't possibly let them off the hook for murdering her father. One way for Vivi to settle her score with the World Government without abandoning her responsibilities is to ally her kingdom with the Revolutionary Army.
Such an alignment would provide Vivi and the people of Alabasta with invaluable benefits and protection. The Revolutionary Army is a formidable force that opposes the World Government's oppressive rule. By joining their ranks, Vivi can gain access to resources, guidance and support that would help her protect her kingdom from the World Government and its agents' machinations.
The goals of Vivi and the Revolutionary Army overlap significantly. The World Government and the Celestial Dragons are their shared adversaries. The Revolutionary Army aspires to demolish the repressive system and create a more just world. If they encounter the World Government in future One Piece chapters, Vivi will still have a chance to fight alongside the Straw Hat Pirates in the next conflict.