Table of contents
— Akainu, whose real name is Sakazuki, is undoubtedly the most hated—and most important—character in One Piece. Fleet Admiral of the Marines, user of the Magu Magu no Mi, and architect of uncompromising justice, he committed the unforgivable: the death of Portgas D. Ace in chapter 574, one of the most painful moments in the entire history of the manga. Understanding Akainu means understanding the structural antagonism at the heart of One Piece between freedom and order. For broader context on the Marines, start with our complete guide to the Marines and the World Government. For Ace's biography, see our dedicated article on Portgas D. Ace. Reading time: 12 minutes.
Sakazuki: origins and rise to power
An admiral with an ideological profile
Sakazuki, also known as Akainu (“Red Dog” in Japanese), is presented in the manga as the embodiment of an uncompromising ideology: absolute justice. Unlike Kizaru (institutional nihilism) or Aokiji (moderate justice), Akainu truly believes in what he does. To him, any tolerance toward pirates threatens the order of the world. This conviction makes him not irrational, but dangerously consistent. Oda was inspired by actor Bunta Sugawara for Akainu's design, choosing a massive appearance, strongly marked features, a permanent scar on his face—a several-days' growth of beard, a merciless gaze. Every visual detail reinforces the impression of a man who has never backed down. His Marine uniform, always immaculate, contrasts with the absolute violence of his actions.
The Ohara incident and his formative reputation
Even before appearing in the Marineford arc, Akainu's reputation is established by an illuminating flashback: the Ohara incident (chapter 395). When the Buster Call is launched against the island of archaeologists, a Marine ship carrying innocent civilians approaches the danger zone. Akainu orders it sunk, considering the civilians who had learned about the archaeologists of Ohara a risk of forbidden information leaking. This act defines Akainu better than any other: for him, the greater good (the order of the world) justifies sacrificing individual innocence. It is utilitarian logic taken to its extreme. For context on Ohara's destruction and its connection to Robin, read our article on Nico Robin and the Poneglyphs.
The Magu Magu no Mi — the power of lava
The most destructive Logia fruit?
The Magu Magu no Mi is a Logia fruit that allows Akainu to transform into, create, and control magma. It is generally considered the most destructive Logia fruit in terms of raw offensive power—particularly because lava (approximately 700–1200°C) surpasses fire (400–600°C). This is made explicit in the manga itself: during the Marineford War, Akainu’s magma is shown consuming the flames of Ace’s Mera Mera no Mi (chapter 570), providing one of the most devastating pieces of evidence for the hierarchy of Devil Fruits in One Piece. For the complete comparison of Devil Fruits, see our Devil Fruit and Haki guide.
Key Magu Magu no Mi Techniques
Among Akainu’s most notable techniques are:
- Gyan Mafuyu — a lava fist whose penetrating heat ignores normal physical defenses.
- Inugami Guren — a molten lava dog-shaped attack, symbolizing his nickname, “Red Dog.”
- Ryusei Kazan — a rain of magma fists falling from the sky, used on a massive scale at Marineford.
The deadliest aspect of the Magu Magu no Mi is not its temperature alone, but its ability to cause injuries that do not heal: lava burns poison the body from the inside, making any recovery nearly impossible without exceptional medical intervention. This is how Ace died: pierced by Akainu’s lava fist, his burning body could no longer regenerate.
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“Absolute Justice”: Philosophy and Criticism
A Coherent but Terrifying Ideology
Akainu's “absolute justice” (Zettai Seigi) rests on a simple premise: the order of the world is worth more than any individual life. Pirates, by their rebellious nature against the established order, are enemies of that order. Tolerating them risks the collapse of world peace. Akainu does not kill out of sadism—he carries out what he considers a moral imperative. That is precisely what makes him so unsettling: there is nothing irrational about his behavior. He sincerely believes that he is protecting the world. Through Akainu, Oda confronts the reader with the central question of One Piece: who has the right to define the world order? The World Government, heir to a history that conceals gigantic crimes such as the Void Century? Or the individuals who refuse this imposed authority?
Akainu vs. Aokiji: Two Visions of Justice
When Akainu and Aokiji fought for 10 days at Punk Hazard for the title of Fleet Admiral (chapter 699—flashback), it was far more than a clash of strength: it was the collision of two philosophies. Akainu's victory marked the dominance of absolute justice over moderate justice within the Marines, with enormous consequences for the rest of the manga.
The Internal Consistency of an Antagonistic Figure
What makes Akainu such a great antagonist is that he isn't a hypocrite. He isn't corrupt. He isn't seeking wealth or personal power. He simply wants a world where pirates can no longer sow chaos. To achieve that, he is willing to do anything. That's what fans struggle to forgive him for—but it's also what makes him one of the richest characters in the series. To understand how his philosophy fits into the structure of global power, read our analysis of the Holy Knights and Imu.
Ace's Death: The Moment That Changed Everything
Chapter 574: The Trauma of the Global Fandom
One Piece Chapter 574, titled “The Fire Fades,” is one of the most devastating chapters in manga history. Portgas D. Ace, Luffy's sworn brother and son of Pirate King Gol D. Roger, dies after being pierced by Akainu's lava fist while stepping in to protect Luffy. This is not the death of a minor character—Ace had been one of the most beloved characters since the beginning of the series (his introduction dates back to Chapter 159). His death shocked fans worldwide, and the narrative repercussions are still visible years later in the manga: Luffy's post-Marineford trauma, the development of advanced Observation Haki, and the deep motivation that drives him in every subsequent arc.
Why Did Akainu Kill Ace?
Akainu's reasoning in this act is chillingly consistent: Ace is the Pirate King's son. As such, he represents the greatest symbolic danger to the world order. Letting Ace escape means accepting that Roger's legacy survives. Akainu did not kill Ace out of sadism or personal revenge—he carried out his philosophy. In doing so, he created Luffy's greatest trauma and, indirectly, helped forge the future Pirate King. Oda delivers a masterful narrative twist here: Akainu's worst act is also the one that forges the hero. To relive this war in its entirety, read our complete analysis of the Marineford War.
⛳ TRIBUTE TO ACE
One Piece Sneakers — Ace Black
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A stylish tribute to Luffy's brother. These matte-black sneakers featuring an Ace design are an essential footwear choice for any fan who has not forgotten Chapter 574. Premium quality, everyday comfort.
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Akainu Fleet Admiral: After Marineford
Victory Over Aokiji and the Rise to Power
After the Marineford War, Sengoku (the Fleet Admiral at the time) resigns. The choice of his successor comes down to two candidates: Akainu and Aokiji. The vote is tied among the generals. The two men agree to settle the matter through a one-on-one fight on Punk Hazard Island. After 10 days of combat that destroy half the island (creating the fire and ice zones the crew will discover in the Punk Hazard arc), Akainu prevails. Aokiji refuses to serve under him and deserts the Marines. It is a victory that changes everything: under Akainu, the Marines are even more uncompromising than before, and the consequences for the manga's ending are considerable.
Comparison between the three main Fleet Admirals
| Characteristic | Sengoku | Akainu | Aokiji candidate |
|---|---|---|---|
| Type of justice | Human | Absolute | Moderate |
| Devil Fruit | Hito Hito (Daibutsu) | Magu Magu | Hie Hie |
| Impact on the series | Durable | ★ The most decisive | Ambiguous |
Figurine — Mera Mera no Mi Devil Fruit (Ace)
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Official replica of the Mera Mera no Mi, Portgas D. Ace’s Flame-Flame Fruit. A unique collector’s piece to pay tribute to Luffy’s brother and one of the most beloved characters in One Piece.
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Frequently asked questions
Answers to the questions most frequently asked by fans about Akainu.
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