Hellfire Flame

Hellfire Flame comes from the hidden ninja village and belongs to the elite generation known as the “Golden 37th Class.”

He is a senior to Onsoku no Sonic and Senkou no Flash and is always paired with his fellow classmate, Gale Wind.

He originally appeared only in the Murata (remake) version of One-Punch Man.

Later, he was “brought back” into the original webcomic continuity, appearing there starting with chapter 115.

In both the original and remake versions, he longs to step out of the shadows of covert work and gain recognition on the public stage.

This desire to be seen and acknowledged strongly motivates his decision to side with monsters.

His voice actor in the anime adaptation is Takumi Yasue.

Hellfire Flame has upright, spiked hair and an almost permanent blank expression.

At first glance he seems stoic and quiet, but once he starts talking he becomes surprisingly talkative and expressive.

Compared to Gale Wind, who often takes the lead in conversation, Hellfire Flame is usually more reserved.

However, when battle or ideology comes up, he reveals a sharp tongue and an eager, almost theatrical way of speaking.

In his human form, he dresses as a ninja and carries a single long blade.

His demeanor is calm and composed, fitting the image of a professional assassin from the ninja village.

When he becomes a monster in the remake version, his face and body bulge with vein-like patterns.

His skin takes on a reptilian, dragon-like texture, and his entire body becomes wreathed in flames that he can control at will.

The monster form evokes the image of a fire dragon, emphasizing both his speed and overwhelming destructive power.

The visual contrast between his emotionless face and the raging flames makes him stand out among other Monster Association members.

In the original webcomic, Hellfire Flame is one of the top fighters within the rebel ninja group known as the Ninja Party.

He is considered on par with Gale Wind, marking him as one of the elite among elite ninjas.

In the remake version, his disaster level in human form is classified as Demon.

As a criminal, he carries a Special S-Class bounty, putting him among the most dangerous human targets in the setting.

He fights using a single long sword.

During battle, this blade becomes enveloped in flames, massively increasing its cutting and burning power.

Hellfire Flame has adapted and upgraded the “Wind Blade Kick,” a high-speed cutting kick used by Onsoku no Sonic and Senkou no Flash.

His own version is an advanced flame-based variant that marries his ninja footwork with his fire arts.

Once he undergoes monsterification, his disaster level rises to Dragon.

In this state his physical capabilities—speed, strength, durability—escalate dramatically, and his fire techniques reach a terrifying scale.

As a Dragon-level monster, he combines overwhelming speed with devastating flame-based ninjutsu.

He can ignite his body, weapons, and attacks, turning every movement into a burning slash or explosive strike.

When he decides to fight at full power as a monster, he discards both conventional ninjutsu and weaponry.

Instead, he relies on raw monster physiology and extreme speed, launching relentless close-range assaults that leave little room for counterattacks.

Named Techniques

Flame Blade Kick (Enjin Kyaku / Flame-Edge Kick)

This technique is a fire-enhanced evolution of the Wind Blade Kick used by Sonic and Flash.

Hellfire Flame channels flames along his leg and foot, then uses ninja-level speed to deliver a slicing, flaming kick that cuts and burns simultaneously.

Fire Style: Scattered Flash Slash (Katon: Sansen Zan)

This is a continuous flurry of sword strikes infused with flames.

He unleashes rapid-fire slashes that scatter burning arcs around the battlefield, overwhelming opponents with both blade and fire.

Together, these techniques show how he blends traditional ninja arts with monstrous flame abilities.

They also highlight his focus on speed, precision, and area control in combat.

Hellfire Flame was born and trained in the ninja village, a hidden community dedicated to producing highly skilled assassins.

Within this village, he is part of the prestigious “Golden 37th Class,” an especially gifted generation.

He is the senior of Onsoku no Sonic and Senkou no Flash.

Both later become famous in their own ways—Sonic as a rogue ninja and Flash as an S-Class hero—while Hellfire Flame takes a darker path.

His closest associate is Gale Wind, who graduated from the same class.

The two operate as a pair, often appearing, fighting, and making decisions together, effectively functioning as a single unit in many scenes.

Alongside Gale Wind, Hellfire Flame rebels against the traditional role of ninjas as invisible tools.

He despises the idea of living and dying in obscurity, and dreams of gaining glory and recognition for his abilities.

This shared dissatisfaction pushes him and Gale Wind toward radical choices.

Ultimately, they align themselves with the Monster Association, seeing monstrous power and public chaos as a way to break free from the shadows.

Their “Golden 37th Class” also includes another ninja named Thunder of Lightning.

This hints at a broader network of highly skilled ninjas whose paths may have diverged in different directions.

For more detailed information about their joint history and shared events, the story of Gale Wind provides additional context.

Within the Monster Association, Hellfire Flame stands as a Dragon-level threat and a candidate for a leadership position.

His power level, combat experience, and elite ninja background make him one of the organization’s more formidable members.

He brings a distinct style to the Monster Association’s roster.

Where many monsters rely on brute strength or grotesque abilities, Hellfire Flame combines ruthless ninja technique with disciplined fire control.

His presence also deepens the worldbuilding around the ninja village.

By showing a senior generation that rejected traditional ninja roles, he adds contrast to figures like Sonic and Flash, who navigate their own conflicts with that same background.

Hellfire Flame’s goal of emerging from the shadows into the spotlight creates personal stakes beyond simple villainy.

He is not only a monster, but also an ambitious ex-ninja who wants the world to finally see just how strong he is.

Unlike Gale Wind, Hellfire Flame’s design does not significantly change between the original webcomic and the Murata remake.

His core look—spiked hair, stoic face, flame-based style—remains consistent across versions.

Even before monsterification, he is already treated as a major threat thanks to his Demon-level classification and Special S-Class bounty.

After becoming a Dragon-level monster, he firmly occupies the upper tier of dangerous enemies in the series.