The final battle of One Piece is approaching rapidly, and all major factions in the world are gearing up to prepare for the greatest clash in history. As Luffy and the Straw Hat crew move closer to the legendary treasure of Joy Boy and Roger, alongside the Yonko’s rising powers, the World Government must also bolster its own military strength.
The one who leads this military force is none other than Akainu, the Fleet Admiral of the Navy. This character has already become a significant figure since he dealt a devastating blow to Ace and Whitebeard during the Marineford War. However, many fans in the One Piece community are beginning to question the extent of his power in the final battle. Now, let’s analyze why Akainu could be the most formidable character throughout the entirety of One Piece.
Akainu has absolute control over the entire Navy

The Navy is the primary military force of the World Government, directly confronting pirates and other threats. The current head of this organization is Fleet Admiral Akainu, who holds absolute power. He has complete authority over structure, operations, and all activities of the Navy.
Even though there are no specific details about Akainu’s daily tasks, every subordinate is aware of the overwhelming power he wields, and all must bear responsibility directly under him. This showcases the authority and terrifying influence that Akainu will exhibit in the final battle.
During the Marineford War, Sengoku (while he was still Fleet Admiral) could control the entire war with just one command, demonstrating the sheer level of power Akainu currently possesses.
Akainu wields one of the strongest Logia-type Devil Fruits

In a world filled with incredibly powerful individuals and Devil Fruits, everyone has the strength to challenge entire armies. Oda has declared that Akainu’s Magu Magu no Mi (Magma-Magma Fruit) is the strongest Logia-type fruit in terms of offensive capability. This suggests that he is more than just a formidable soldier; he is a general of immense power. Whitebeard has always been known as the strongest man in the world, and although he reached a peak during the Marineford arc, it was Akainu who ultimately ended his reign.
In the earlier parts of the series, Logia-type Devil Fruits were incredibly powerful due to their ability to render physical attacks ineffective against their users. However, the introduction of Haki changed everything. Even so, the use of advanced Haki is still a critical factor for a normal individual, which is why Akainu can only be harmed by the strongest characters. Additionally, many subtle details suggest that he has mastered advanced Haki, making him even more dangerous when facing opponents. This could explain why Punk Hazard is always engulfed in flames.
Akainu is likely to be a user of all types of advanced Haki

The emergence and development of Haki have completely transformed the power dynamics in One Piece, making Logia users no longer invincible as they once were. Notably, the ability to “harm” Logia users has been a game-changer. In the current Final Saga, as every character reaches staggering levels of strength, the ability to use Haki has become essential. Regarding Akainu, he has been confirmed to be a user of Advanced Haki, even occasionally displaying it during the Marineford War.
From a logical standpoint, it would be hard to believe that Akainu does not master all types of Haki, especially when Sengoku (the former Fleet Admiral) is one of the few Admirals capable of using all three types. This strongly suggests that Akainu also possesses Conqueror’s Haki. Notably, a common trait among Conqueror’s Haki users is an insatiable ambition, which aligns perfectly with Akainu’s character—someone who relentlessly pursues absolute justice and harbors a daunting ambition.
With terrifying strength, absolute authority, and unyielding ambition, Akainu is positioned as one of the most formidable adversaries, if not the strongest, in the final battle of One Piece.
Source: Gamerant