Like the world One piece franchise expanding to unprecedented size, fans realized that there were three distinct eras of the series. Not to be confused with the 3 ages of the world, these eras are basically much shorter periods of time that are generally defined by one main character.
So we know three main eras One piece; the Joyboy era during the Void Century, the Roger era, and the current Luffy era. With that established, let's take a look at the two strongest Devil Fruit users in each of these periods to see who was the greatest.
One Piece: 8 Devil Fruits that Rival Killingham's Ryu Ryu no Mi, Model: Kirin
Killingham's Devil Fruit is one of the most powerful we've ever seen, so let's take a look at every Devil Fruit that competes mightily with it.
Joyboy was the original user of the Nika fruit
Time: Void Century
In the Wano arc, it was revealed that Devil Fruits, especially Zoan Fruits, have a will of their own and actively seek out those whose wills align with their own. Because of this, the first person we know to ever use the Nika fruit was Joyboy, who awakened it during the Void Century and went around the world freeing the oppressed.
Because of this, we know that Joyboy was an exceptionally powerful user of his Devil Fruit, as only a small percentage of people awaken their fruit, and it seemingly took the full power of Imu and the World Government to take him down. To this day, Imu trembles in fear at Joyboy's name, which alone speaks of his incredible power.
Nerona Imu has a terrifying devil fruit
Time: Void Century
The Elbaf arc was already one of the biggest in the series, but chapter 1179 cemented it as possibly the most important arc One piece also. That's because we finally got a glimpse of Imu's true form, and we also got a little insight into his Devil Fruit powers, which may be the most powerful in the series.
As the user of the Akuma no Mi, or Devil Fruit, Imu has access to a variety of terrifying abilities that work around the demonic nature of his fruit. By turning targets into slaves and securing pacts that give humans immense power, Imu has established himself as the greatest power in the world since the Void Century.
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Whitebeard's Tremor Fruit made him the strongest man
Time: Roger era
Throughout One piece series, many considered Whitebeard to be the World's Strongest Man, which was even his nickname for most of his career as a pirate. Although his Haki is some of the greatest in history to rival Roger's, the real reason he was considered such a threat was his Gura Gura no Mi Devil Fruit.
One would not be wrong to consider the Tremor Fruit to be the single most powerful Devil Fruit in the series, as it allows the user to create powerful earthquakes on any surface that can destroy entire islands. It is said to be powerful enough to destroy the entire world. Whitebeard had never awakened him because it went against the type of person he was, but his power was legendary.
Kaido gained the abilities of an azure dragon
Time: Roger era
Although it may be a questionable choice for many, due to the incredible power of Big Mom at the time, in the end, Kaido's Uo Uo no Mi, Model: Seiryu fruit remains one of the most powerful Devil Fruits of all time. While it can be argued that Big Mom was stronger than Kaido during this time due to her Haki, Kaido's Mythic Zoan was actually stronger than her fruit.
As one of the promised prizes of the Aboriginal Hunter Competition during the God Valley Incident, this fruit was coveted by many, and after unlocking its immense power, Kaido was strong enough to take on the strongest characters on the island at the time. Although it was never really useful, Kaido even stood up to Imu in this age of Haki.
One Piece: Devil Fruit users who can rival Roger
Although Roger had some of the greatest Haki of all time, there were some who only rivaled his power through Devil Fruits.
Luffy is the current user of the Sun God Nika Fruit
Time: Current era
As was the case with Joyboy, Hito Hito no Mi, Model: Nika sought out the one who plays a similar role as the great liberator in modern times, who turned out to be none other than Luffy. After awakening the true power of this devil fruit in the fight against Kaido, Luffy is now the most prominent figure in the fight against tyranny.
Of course, Luffy's actual power with this fruit is still quite limited as he can only use Gear 5 for 5 minutes at a time before his stamina is completely depleted. However, once he overcomes this flaw, he is ready to fight Imu at the very end to decide the fate of the world in the Final War.
Loki's Nidhogg fruit makes him much bigger
Time: Current era
From the very beginning of the Elbaf arc, fans have been anticipating Loki's Devil Fruit, which was said to be a legendary hand-down from the Elbaf royal family. It eventually turns out to be the Nidhogg Mythical Zoan, which turns the user into an absolutely titanic dragon whose size depends entirely on the user's size, and since Loki is an ancient giant, he becomes extremely large.
In his Nidhogg form, Loki is shown to be so powerful that only the strongest of beings can hope to challenge him, further confirmed by the fact that he is unimpressed by Imu's Domi Reversi. Everything revealed about this legendary Devil Fruit confirms that it is the most powerful in the modern era next to Luffy's Nika Fruit.
