Is it ever explained why some humans develop superpowers in the One-Punch Man universe? I'm not just talking about Saitama, I'm talking about the other heroes and martial artists. No one seems to think it's unusual that there are people who can lift up huge boulders (Tank Top Master), move faster than the eye can see (Flashy Flash), or smash through thick concrete prison walls (Pri Pri Prisoner). Such people are just "strong" or have "trained". And then you have the esper sisters and the occasional oddball like Green.

It is implied that the Hero Association physical test looks for enhanced physical characteristics, although it's not explicitly stated as such. The series doesn't seem to want to confirm or deny that C-, B-, and A-Class heroes are actually super-powered, although there is evidence that they all must be, at least in terms of how super-powers are defined in Western comic books, i.e., physical abilities greater than a human could naturally have.

Is it a manga trope that people can naturally develop powers, or is there a hint as to why some people in this universe develop powers?

  • Actually, everyone does view the S-class as incomparable monsters. The typical person who sets out to be a hero is only aiming for the top ranks of A-class. S-class is like the impossible dream. May 29, 2019 at 20:17
  • @Eti2d1I'm not familiar with One-Punch Man, but I don't think these are duplicates. The linked one is asking how Saitama got his powers whereas this one seems to be asking all powers as a whole. May 31, 2019 at 12:39
  • @Wondercricket Yes, you could be right. Although the answers there insinuate the source of superpowers in OPM, it's not answering the whole question. I just retracted it.
    – Eti2d1
    May 31, 2019 at 14:54

2 Answers 2


Like many settings with a multitude of heroes, it's a grab bag of virtually every possible origin.

First, you mention a lot of S-class heroes in the post, but these are considered the exceptions; people at what is otherwise an unreachable level of power. The following image is from the webcomic, chapter 67, which is technically a spoiler for people only following the anime or manga, but does not cover any real plot lines; it's simply part of detailing the origins of the S-class. But I'll spoiler tag it anyway:

webcomic chapter 67, page 4

Known or implied power origins include:

  • Tank Top Master and Puri Puri Prisoner: Strength training.
  • Super Alloy Darkshine: Strength training, but claims his was "different" from the previous two.
  • Bang/Silver Fang: Martial arts training
  • Zombie Man: Genetic and medical experimentations by Dr. Genus. His only power is immortality/regeneration, however; physically and mentally he's an average person.
  • Metal Knight, Drive Knight, Genos, Blue Flame, Gatling Gun, etc: technological enhancements.
  • Fubuki, Tatsumaki, and other espers: power had since birth, presumably genetic or otherwise "naturally occurring". It is possible to achieve higher levels of skill and power over time, by training.
  • Flashy Flash and Sonic: Ninja training and techniques.
  • Boros: The individual pinnacle of a race made intrinsically super strong by evolving in a harsh environment.

Of course we see many of the above (most of who are S-class, as they're the ones we have the most exposure to over time) achieve feats far greater than we would expect possible from things like strength training and martial arts.

There are a few other origins from the webcomic and manga that might suggest additional mechanics within the setting.

Saitama's power seems to originate from ignoring his limits to the point that he ceased to have any. Garou seems to almost achieve the same thing by the end of his arc, falling a little short but otherwise ascending to a level of power and skill that seems to surpass everyone but Saitama. The idea of an intrinsic limiter on power is key to the series by this point. It is reasonable to believe this is a fundamental mechanic of the setting, as it has been stated by both in-world characters as well as the "narrator". It is indicated that the extremely powerful beings just have a higher limit and have worked to reach it, and/or used experiments and such to increase it. Or in some cases simply being born at a very high level, like with Tatsumaki. Saitama and almost-Garou break the mold by breaking this fundamental rule of existence, and that's how they surpassed the unsurpassable S-class.


Gyoro-Gyoro created Lord Orochi (a manga and anime only character) through various unspecified experiments, and is confident they can reproduce the results with a sufficiently durable specimen; Garou is considered a candidate for surviving the process and surpassing Orochi.


But most tellingly and perhaps relevant for future arcs, Homeless Emperor attributes his power as a gift from "God". When he's telling this to Zombie Man he then has a vision of this "God", who says he's taking back Homeless Emperor's life and power. Homeless Emperor then (literally) combusts and dies before Zombie Man's eyes. Zombie Man is willing to believe there is some entity that gave Homeless Emperor his power, and is concerned about what this entity is up to. We have neither seen nor heard of any such entity since then, but it may come up in future story arcs. As such there may be some god-like being who grants at least some people and/or monsters their power.

Several monsters also profess that they had an intense obsession with something, which then transformed them. Such as Crablante, the first monster Saitama is known to fight (before he begins his training). Perhaps some heroes, like Watchdog Man, have a similar origin. Possibly the previous spoiler is relevant to such transformations. Otherwise, the best we can say right now is that the setting permits fairly arbitrary origin stories, in part because out-of-universe it is constructed as a parody and at times deconstruction of the (super)hero genres.

  • In Japanese shonen, characters often have unexplained superhuman powers, so it's basically just a convention. Training doesn’t explain why some people get powers (Garou) and others don’t (Charanko). This trope seems like incomplete world-building. I might explain OPM powers in one of two ways: 1. The “Limiter” is real, and a few people’s limiter is set high, so they can become superhuman by training. 2. Humans in OPM have the genetic potential to transform into monsters, but some can get the monster powers without the monster form. There are hints the series will address this point further.
    – Aaron C
    Jun 4, 2019 at 22:37
  • @AaronC Some form of heritage (be it genetics, special clans, whatever) is a fairly common explanation in a lot of stories. But even in these it is often the implicit assumption that human limits are intrinsically higher, and the right people with the right training can achieve things that seem superhuman to us, but is fairly natural to them. As such there doesn't have to be a reason why some people get powers; that this was possible and that you're following such lucky lottery winners is the very conceit of the story's existence. Jun 5, 2019 at 23:46


I think it has less to do with training, and more to do with the struggle and perseverance that you go though while training.

For Saitama, his training routine may not be objectively hard. But for him it was very difficult. He describes it as Hell and that it was so taxing that it hade his hair fall out and he became physically ill. Yet he endured, he continued to persevere through that and continue struggling, gaining his superpower as a result.

We don't see what the other heros were like during their training or before they gained powers, but with how many of them gained their powers due to strength training, I think it is evidence that perseverance and struggling is linked to gaining powers in this way.

We also see this through Garou. Spoilers ahead

His continuous, non-stop attack on the Hero Association brought him to the brink of life and death. Yet he persevered and continued his attack despite his injuries. We see this struggle up close and see him grow stronger and stronger each time he survives one of these near-death fights.

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