The Ultimate Mystery: 5 Shocking Facts And Latest Theories About Who Is Deku's Dad (Hisashi Midoriya)

Despite the epic conclusion of the *My Hero Academia* manga, one of the series' most enduring mysteries remains: the true identity and role of Izuku Midoriya's father. As of December 10, 2025, the character known as Hisashi Midoriya has still not made a definitive, in-person appearance, leaving fans with a handful of established facts, a mountain of speculation, and a crucial, new clue from the final chapters of the story. This article dives deep into everything we know—and don't know—about the man who fathered the world's greatest hero.

The question of "who is Deku's dad" has fueled countless fan theories since the beginning of the series, primarily because his absence is so pronounced in a story focused on lineage and inherited power. While the main narrative has wrapped up, the latest updates from creator Kohei Horikoshi and the final manga chapters confirm that the mystery of Hisashi Midoriya is one of the biggest unresolved plot points in the entire *My Hero Academia* universe.

Hisashi Midoriya: The Known Facts and Official Biography

For a character so integral to the protagonist's life, the established facts about Hisashi Midoriya are surprisingly sparse. All of the concrete information we have comes from a brief, early mention by his wife, Inko Midoriya, in the first season of the anime and the early chapters of the manga. His profile is essentially a list of basic biographical details that serve only to explain his absence.

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• Full Name: Hisashi Midoriya (緑谷久, Midoriya Hisashi)
• Family: Husband of Inko Midoriya and father of Izuku Midoriya (Deku).
• Quirk: Fire-Breathing (or a similar fire-based Quirk). Inko describes his Quirk as allowing him to breathe fire. The strength of this Quirk is implied to be minor, especially when contrasted with the powerful abilities of characters like Endeavor.
• Status/Occupation: He is said to be working abroad. This is the primary, official reason given for his long-term absence from Izuku's life.
• Manga Appearance: He has never been fully seen in the manga or anime, only referenced in dialogue.

This minimal profile is what initially sparked fan curiosity. In a world where Quirks define a person, Hisashi's simple "Fire-Breathing" power and his distant job seemed too generic for the father of the successor to One For All (OFA). For years, this led to the intense speculation that his true identity was a cover for a much darker secret.

The Biggest Unanswered Question: Why Did Horikoshi Leave the Mystery Unsolved?

The most current and shocking update about Hisashi Midoriya is that he was not officially revealed in the final chapters or epilogue of the *My Hero Academia* manga. This goes against previous statements made by the series creator, Kohei Horikoshi, who had mentioned in interviews that he planned to introduce Deku's father at some point in the story.

The decision to leave this major plot thread unresolved has become the subject of intense post-series discussion. The prevailing theories suggest a few possibilities:

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1. The Character Was Simply Unimportant

One argument is that Hisashi Midoriya's only narrative purpose was to provide a genetic explanation for Izuku's mother's Quirk (attraction of small objects) and his father's Quirk (Fire-Breathing), which combined to form the basis for Izuku’s own (non-existent) Quirk, before he was revealed to be Quirkless. In this scenario, his distance was a deliberate choice to ensure All Might could become Deku's sole, definitive father figure, making Hisashi's appearance irrelevant to the core themes of the story.

2. The 'All For One is Deku's Dad' Theory Was Too Distracting

The theory that the ultimate villain, All For One (AFO), was secretly Hisashi Midoriya gained massive traction due to several coincidences, including AFO's ability to steal Quirks (explaining why Deku was initially Quirkless) and a subtle similarity in their names (Hisashi means "a long time," which could nod to AFO's long life). By not revealing Hisashi, Horikoshi avoided confirming or explicitly debunking the theory, allowing the focus to remain purely on the final battle between Deku and AFO, rather than a dramatic family reveal.

3. The Last-Minute 'Soft' Reveal in Chapter 425

In a final twist, the time skip epilogue of the manga, specifically around Chapter 425, introduced a brief, dark-haired "mystery character" wearing a muzzle or face-covering device. This immediately sparked speculation that this was a soft, non-explicit reveal of Hisashi Midoriya. Fans connected the muzzle to his Fire-Breathing Quirk, suggesting the device might be needed to suppress his power, or that he had been in some form of custody. However, this character was not officially named, meaning the definitive answer remains elusive.

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Dissecting the Fire-Breathing Quirk and Its Significance

The only truly unique piece of information about Hisashi Midoriya is his Quirk. Inko Midoriya's description of his ability to breathe fire is the only canon detail that gives him any distinct characteristic. This detail is crucial for several reasons:

A. The Genetic Link to Izuku

Izuku's initial diagnosis of being Quirkless was based on the absence of either his mother's or father's Quirk. Hisashi's Fire-Breathing Quirk is a simple, emitter-type ability, which contrasts sharply with the complex power of One For All that Izuku later inherits. The simplicity of his Quirk was likely intended to make Izuku seem as ordinary as possible before his destiny changed.

B. Debunking the All For One Theory?

While the AFO theory was popular, the official mention of the Fire-Breathing Quirk was often used to argue against it. AFO's original Quirk was only the ability to steal and give Quirks, not a fire-breathing ability. For the theory to work, AFO would have had to steal a Fire-Breathing Quirk and use it as a cover, which adds unnecessary complexity to an already convoluted plot.

C. The Chapter 425 Muzzle Clue

The latest speculation is that the Fire-Breathing Quirk may be more powerful or difficult to control than initially suggested, which would justify the mystery character in Chapter 425 wearing a muzzle. If the character is indeed Hisashi, the muzzle would be a visual cue linking him to his known ability, finally giving a reason for his long-term absence and non-appearance—perhaps he was detained or in hiding due to his Quirk or an association with a villain.

The Final Verdict: A Deliberate Unresolved Mystery

In the end, the mystery of who is Deku's dad, Hisashi Midoriya, appears to be a deliberate, narrative choice by Kohei Horikoshi. Instead of a dramatic reveal that would have overshadowed the main themes of legacy and self-made heroism (embodied by All Might and Deku), the character was left as a symbolic absence.

Hisashi Midoriya represents the average, distant parent in a world of superheroes, ensuring Deku's journey from Quirkless underdog to the world's greatest hero was entirely his own, unburdened by a secret, powerful lineage like that of Shoto Todoroki or even All For One's brother. The final chapters of *My Hero Academia* confirm that the official answer is simply the man who works abroad and breathes fire, with the possibility of a final, ambiguous tease left for fans to debate for years to come. The enduring curiosity about Deku's biological father is now, perhaps, the final Quirk of the series itself.