Like the last war of One Piece inches closer with each passing chapter, fans have come to realize that the stakes of this massive conflict will be higher than ever and will call upon nearly every character from the series' past. Because of this, fans fear the death of their favorite supporting characters.
With Imu and the World Government's forces incredibly powerful, it is very clear that some of the most important allies of the Straw Hats will meet their end in this war. So, in this article, let's go through the Straw Hats' greatest allies and see what their chances are of survival in One Piece's The last war.

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Nefeltari D. Vivi will control Alabasta's powers
Risk of dying: Low
As one of the Straw Hats' oldest and most important allies, Vivi was recently revealed to have been part of the fabled Clan D. and, following her father's death, is now the true ruler of Alabasta. In truth, her chances of dying in the final war are pretty low due to her connections and parallels to Lily, especially as the rightful ruler of Alabasta. Since her country is one of the most important to the overall story and there are no sovereigns there to replace her, it is clear that Vivi's fate is secure.
Boa Hancock is the ruler of the Amazon Lily
Risk of dying: Low
Boa Hancock is one of the few characters in the entire story to have the ability to use Conqueror's Haki, setting her apart as an incredibly powerful fighter and one of the most dangerous pirates on the seas due to this and her overpowered Devil Fruit ability. That being said, the chances of her dying in the final war are pretty low, especially considering that most fans believe that she will end the series by marrying Luffy.
The Straw Hat Grand Fleet is important
Risk of dying: Low
Most of the Straw Hat Grand Fleet are not particularly fleshed out characters in their own right, and are almost always referred to as a collective by the fandom rather than individually. Because of this, many believe that they will play one of the most important roles in the final war, although they are unlikely to meet their end here due to their role in history. Of course, some of the many crews here may perish, but for the most part, many believe they are safe.
Rebecca will be at the forefront of Dressrosa Kingdom
Risk of dying: Low
The Dressrosa arc finally revealed the Straw Hats' vast fleet, cementing them as the vanguard in the final battle against the World Government in the Last War. Before this, Rebecca was revealed as the princess of the Dressrosa Kingdom, so it comes as no surprise that she and her country will play a pretty significant role in this conflict, although it's pretty unlikely for her to meet her end here due to her role in the story and what she means to her kingdom.
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Momonosuke and Yamato will lead Wano's forces
Risk of dying: Low
Wano, along with Fishman Island, Alabasta, and Elbaf, will be one of the most important allies of Luffy and the Straw Hats in the final war due to the country's historical and overall importance, especially due to its relationship with Pluto. Unlike most others, Momonosuke's fate is largely already known after the war, as he was revealed to become one of Wano's greatest rulers. This is largely true for Yamato as well, as many believe they will join the Straw Hats in the end.
Koby and SWORD will join the Straw Hats
Risk of dying: Low
Although Koby is currently an active adversary trying to stop Luffy, the truth is that he and the rest of SWORD will likely sidestep the Straw Hats in the final war because of the value they place on saving the innocent. Also, Koby is a very direct parallel to Luffy and many believe that he will fill the “Garp” role in the Final Saga as the man who always hunts down the Pirate King, with many even believing that Koby and Luffy will team up to defeat Blackbeard, just like Roger and Garp did for Rocks.
Wyper will provide assistance from the Sky Islands
Chance to die: Medium
The Sky Islands are some of the oldest and most important when it comes to the greater lore One Piece world, and right now the Straw Hat's most important ally there is Wyper. Many believe that the Sky Islands will play a significant role in the final war, with Wyper perhaps even meeting his end here. This is because he is quite important to the story, but many have forgotten about him over the years, making his death a perfect death to show the seriousness of this global conflict.
Shirahoshi is the princess of the fishmen
Chance to die: Medium
Shirahoshi is the princess of the fishmen and is the latest to inherit Poseidon's powers. Due to her being one of the Ancient Weapons and one of the biggest threats to the World Government, some believe she will be an active target for Imu, but in all fairness she will probably live. Given the thematic importance of the original Poseidon and her relationship with Joyboy, it's likely that Oda will subvert expectations by seeing Shirahoshi finally deliver freedom to her people.

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Marco and the remaining Whitebeard Pirates will help
Chances of dying: Medium
Another wildcard pick, Marco and the remaining forces of the Whitebeard Pirates aren't exactly the most cohesive pirate crew at the moment. It's true that 90% of the fearsome reputation of this crew came from Whitebeard himself, but the rest are no pushovers, especially Marco, who has a powerful Mythical Zoan Devil Fruit. His chances of dying are quite similar to Wyper, and for the same reasons too, although his death would definitely have a bigger impact.
The dragon controls the revolutionary army
Chances of dying: Medium
Monkey D. Dragon is still an enigma One Piece universe, despite being introduced over 1000 chapters ago. But with the final war looming over our heads, he will definitely be on full display soon enough, with most fans believing his power will be some of the greatest in the series. That said, his chances of dying at the end of One Piece is medium, mostly because he has a very vague role in the story so far.