Saitama is widely recognized as the strongest character, with no opponent ever pushing him to his limits. However, other individuals in the series possess extraordinary abilities, making them extremely dangerous in battle.
Some have unmatched strength, while others possess unique powers that could challenge even the most powerful heroes and monsters. Although none of them come close to Saitama’s overwhelming dominance, a few have demonstrated abilities that put them far above the rest.
Some warriors rise, but only one remains undefeated (Photo: One Punch Man/Madhouse)From highly skilled martial artists to beings capable of large-scale destruction, several characters stand out as contenders for the title of the most powerful after Saitama.
Looking at their achievements, battle performances, and the impact they have had on fights, it is interesting to see who ranks highest among them. While many are strong, only a handful truly deserve to be considered the most overpowered aside from Saitama.
Boros: A Warrior Built for Destruction
Among all the characters introduced so far, Boros remains one of the strongest and most memorable opponents. As the leader of an alien invasion, he possessed immense strength, speed, and regenerative abilities that allowed him to survive attacks that would instantly destroy others.
His fighting abilities were far beyond any monster or hero, making him a genuine threat to the planet. Unlike most enemies, Boros was not defeated with a single punch, which made him stand out as one of the rare individuals who could take multiple hits from Saitama.
One of his greatest abilities was his regeneration, allowing him to heal from devastating injuries almost instantly. This made him a difficult opponent, as he could recover from attacks that would normally be fatal.
His energy-based powers also gave him a unique edge, allowing him to unleash massive destructive blasts that could wipe out entire areas. His most powerful move, Collapsing Star Roaring Cannon, had enough energy to destroy a planet, putting him on a completely different level from any other enemy seen before.
If not for Saitama, Boros would have been an unstoppable force, capable of wiping out entire cities and heroes without struggle.
Blast: The Mysterious Hero with Unknown Limits
While Boros is the strongest known enemy, Blast remains one of the most mysterious and powerful characters in the series. As the highest-ranked hero, he has rarely appeared, making his full strength difficult to measure.
However, based on what has been revealed, he possesses abilities that make him unlike any other hero introduced so far. His speed and strength seem to be on another level, and he has demonstrated the ability to manipulate space, which allows him to create portals and move across different locations instantly.
Power, skill, and destruction in a battle for dominance (Photo: One Punch Man/Madhouse)One of the biggest factors that make Blast stand out is the fact that even the Hero Association considers him to be a last resort. While Saitama’s strength is unknown to most, Blast is regarded as the strongest hero within the system, meaning that he is likely more powerful than any other ranked hero.
His ability to battle against mysterious cube-like objects and his involvement with strange interdimensional threats suggest that he operates on a level far beyond normal combat.
Unlike Boros, who relied on sheer strength, Blast seems to possess abilities that could affect reality itself, making him one of the most unpredictable characters introduced.
Who Stands Out as the Most Overpowered?
Between Boros and Blast, the answer depends on what is considered the most important power factor. Boros had raw strength, regeneration, and devastating energy attacks, making him the strongest confirmed opponent faced by Saitama.
His durability and destructive abilities placed him far above any other known monster. However, Blast presents a different kind of power—one that is not based on brute force but on abilities that could influence space and dimensions.
If his full strength were revealed, he could easily surpass Boros, depending on the scale of his powers. Without a doubt, both characters exist on a level beyond any other hero or monster aside from Saitama.
Boros represents unstoppable physical power, while Blast embodies mysterious abilities that could go beyond anything seen so far. Until Blast’s full abilities are revealed, Boros remains the most overpowered known character, but Blast could eventually take that position depending on what is shown in the future.