Anime swordsmen are everywhere, even indoors One-Punch Manwhere both heroes and villains like to wield their blades in battle. Although Saitama himself is not a swordsman One-Punch Man the series is still full of skilled sword users with unique and deadly techniques, fighting styles and other abilities.

One-Punch Man: The Hero's 10 Strongest Abilities
These powerful hero abilities can instantly end fights in One-Punch Man.
However, only the strongest swordsmen in One-Punch Man deserves more credit than others. With their sharp blades, thirst for their opponent's blood, and overall prowess as a sword user, these elite swordsmen are the most powerful in One-Punch Man.
8
Haragiri
Driven by ambition, Haragiri decided to abandon his humanity in his pursuit of power. Eventually, he wants to improve his swordsmanship to the point where he can finally defeat Atomic Samurai in single combat.
By consuming the monstrous cell, Haragiri becomes a Mysterious Being and essentially leaves the Swordmaster Council. Even though he gets a significant power boost, especially in swordplay, he still can't beat Atomic Samurai. However, he still holds the title of the fastest swordsman, capable of sheathing his blade at speeds that rival his opponents.
7
Nichirin
One-Punch Man he has his mighty old man in Nichirin, who despite his advanced age can still fight dragon-level monsters with his reed katana. As the head of the Swordmaster Council and master of Spring Mustachio, Nichirin is respected for his swordsmanship, even recognized by Atomic Slash.
Nichirin is also strong enough to face Haragiri head on and hold his own in battle without being a burden to the Atomic Samurai. In fact, he possesses a technique similar to Atomic Samurai's Atomic Slash, known as the Iai Rahu-Ashura Slash, which unleashes a relentless barrage of sword strikes capable of tearing his opponents apart. Even though he died against Fuhrer Ugly, he still deserves a spot on this list for his impressive performances.
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6
Speed-o-Sound Sonic
Sonic is often used as a gag One-Punch Manmostly due to his intense desire to surpass Saitama. Even though he constantly fails to outdo Saitama, there's no denying that he has abilities equivalent to an S-class hero, something even Tatsumaki can agree with.
Like Empty Void and Flashy Flash, Sonic came from Ninja Village, although he is not exactly a gifted ninja. He just crawled his way to the top and never failed to improve his ninjutsu and swordsmanship at the same time. This made him grow stronger enough to fight on a relatively equal level with Flashy Flash.
5
Zombieman
Although fighting is not Zombieman's strong suit One-Punch Manhe remains a highly capable S-class hero who is extremely difficult to deal with. After all, his regeneration seems to have no limits, even allowing him to recover from being decapitated or having his internal organs violently destroyed and scattered across the battlefield by his opponents.
The best thing about Zombieman is that he doesn't just rely on his fast regeneration abilities, but also his prowess as a weapons expert. Zombieman mostly uses a machete and an axe, in addition to the various weapons stored in his trench coat. Against powerful opponents, he relies on a pair of machetes that resemble swords to get the job done.
4
Drive Knight
Drive Knight is another S-class hero who wields a sword on the battlefield. He may have secondary weapons such as ballistic missiles and the like, but often uses a sword to fight. More impressively, he can even create his own swords.
Although Drive Knight has limited energy reserves, that doesn't mean he's an easy target. He is one of the most versatile characters One-Punch Manan unpredictable hero who can adjust his tactical transformations depending on the opponent.
3
Flash flash
Speed is the greatest asset of Flashy Flash, an S-class hero who is known for his cool and calm personality and occasional poor combat decisions. He is among the fastest characters in the entire series, even Saitama acknowledged his extraordinary speed during one of their rare encounters.
While Flashy Flash looks like a noble swordsman at first glance, he is a legitimate shinobi, responsible for a brutal massacre in a Ninja village. Armed with a katana, Flashy Flash also combines ninjutsu with his swordsmanship. From unleashing quick attacks like Flash Slash and Heavy Flash Slash, he can slash his opponents before they can react.
2
Atomic Samurai
Being the wielder of the Sun Blade is enough to make Atomic Samurai one of the strongest S-class heroes in v One-Punch Man. If he ever found the Moonblade in the future, he would potentially surpass his current limits, allowing him to reach an even higher level of swordsmanship.
But even without the Sun and Moon Blades, the Atomic Samurai is already known as the strongest swordsman on Earth. It doesn't matter what kind of sword he uses, because a simple toothpick can even become a deadly weapon in his hands. A single slash of his sword can unleash shockwaves so huge that it looks like a nuclear explosion has ripped through the battlefield.
1
Empty emptiness
While Atomic Samurai is known as the strongest swordsman on Earth, Empty Void is prominent as the strongest ninja in history. Between the two, Empty Void remains the best swordsman as his twin blades can literally cut through space itself with his Dimensional Slash, allowing him to warp and cleave space upon impact.
Adding to Empty Void's resume is his six-figure kill count, having killed over 100,000 targets during his time as a ninja assassin. It's also easy for him to cut through two divine monsters with levels higher than disaster level threats, which shows how terrifying he is as a shinobi and swordsman.
- Release date
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October 5, 2015
- Network
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YouTube, TV Tokyo, TV Osaka, TV Aichi, TVh, TVQ, TSC
- directors
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Shinichiro Ushijima, Makoto Sokuza, Nobuhiro Muto, Ryoh Ando, Shuuji Miyazaki, Youhei Suzuki, Miyuki Ishida, Katsushi Sakurabi, Hideki Okamoto, Yoshio Suzuki, Hiroyuki Okuno, Riki Fukushima, Shigeki Awai
- Writers
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Tatsuro Inamoto
- Franchise(s)
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One-Punch Man
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Makoto Furukawa
Saitama (voice)
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Kaito Ishikawa
Genos (voice)