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This is a page for WMG and theories about One-Punch Man. Due to the sheer volume of theories, they have been sorted into folders.

Tags have been added, but watch out for spoilers.

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    Confirmed Theories 

Speed of Sound Sonic and Flashy Flash are related.
Both of them have redundant names, boast their superior speed and use the Wind Blade Kick as well as sharing extremely similar combat styles. And both reacted exactly the same when meeting Saitama for the first time.

  • Confirmed, they used to be friends and were trained at the same Ninja Village.

Handsomely Sweet Mask is an Ugmon
He's the same type of being that becomes a monster due to their appearance except unlike normal Ugmon's who become uglier, he became handsome but his heart got uglier.

  • Confirmed. He thought he was ugly for so long that he eventually became beautiful, sort of like a reverse-Ugmon.

Saitama is a product of the same phenomenon as the random mysterious beings that are mutated human beings.

The series has introduced examples of human beings that have repetitively performed certain tasks that cause them to transform in a fitting fashion. A man who ate too many crabs became Crabrante, a giant crab man. A person shadowboxed a ceiling light pull cord so much that he became Personification of a Light Pull Cord, a powerful and fast boxing giant. These beings were still people, as they spoke normally and the first example even engaged in a somewhat civil conversation with Saitama at first passing. They were influenced by their power, however. One sought revenge for being drawn upon, and the second desired to test his strength against objects and people.

While these beings were people influenced by their transformations to the extent that they became disruptive to the lives of others, Saitama is different from them only in that he is heroic and doesn't desire to harm innocent people with his power. His extremely powerful punch and generally superhuman fitness is a showing of his desire for strength that he sought through training. He trained so much and so hard that whatever phenomenon caused the changes in the other two beings mentioned happened to him as well. As the others transformed into monsters, Saitama transformed as well; he simply became bald. Thus, he is literally a monster fighting other monsters, but he is a monster that retains most of his original human form.

  • Confirmed by Word of God.

  • A similar transformation occurred in King of Thorn where a tranformation Mass Super-Empowering Event turned a girl into the shape and form of her own twin sister.

  • Maybe that's why Licenseless Rider is able to survive basically any fight he gets into, despite always losing. His obsession is doing good, so the phenomenon turned him into someone who would always be there to help people as best he can. He didn't become a monster or suffer any kind of ill effects (like baldness) because he has an absolutely noble goal, rather than one for personal gain (Saitama is a "hero for fun", whereas Mumen Rider honest-to-God just wants to help people).

Psykos is feigning loyalty to Orochi

If the Monster Raid Arc is a prelude to the Garou Arc, Psykos would have to be the leader of the monster association by the time it happens. Maybe she's already foreseen that Orochi will be killed in the near future (probably by Saitama) and hasn't told him because she sees his death as a chance to seize command for herself.

  • Alternatively, Orochi is just a figurehead (or an entity controlled by Psykos, just like her monster body), leaving Psykos as The Man in Front of the Man.
    • Confirmed. Psykos is the boss behind Gyoro Gyoro, who is the boss behind Orochi.

    Jossed Theories 

Sweet Mask is going to kill a main character at some point.
He's already a complete psychopath, and his Sanity Slippage post-garou is making an already bad condition worse. He's also clearly not entirely human, as judging by his regenerative abilities, so it's possible his crossing of the Moral Event Horizon may be inevitable. What better way to both destroy any remaining audience sympathy and ensure Saitama challenges him seriously than by killing one of his allies? He could even pull an Adrian Veidt to be extra nasty.

  • Jossed. Despite his psychotic tendancies towards monster and anything he views as evil, it truly is only targeted towards them since that is what slows down the monsterization process to his mind.
    • Though he did consider killing the other heroes after he lost to Fuhrer Ugly in front of them, his memory of Blast brought him back to reality.

Genos never was a human he's a robot

There is no destroyed hometown and massacred family, there is no robot bent on destruction: it's all a lie. Dr Kuseno who is a secretly a Magnificent Bastard bullshitted any of Genos' memories of being human in order to give him empathy and other human-like emotions in order to prevent him from going rogue.

  • Jossed. After Genos is melted by Deep Sea King's acid, you can see some muscle on his shoulders and face as well as a spine and a ribcage. He also seems to be crying soon after being defeated.

Saitama will kill Handsomely Masked Sweet Mask.

Saitama and Sweet Mask will fight at some point but Saitama will see that Sweet Mask is more monster than human and will kill him with one punch like usual.

  • Surprisingly enough, it's jossed. Instead he refuses to kill Sweet Mask despite him being a monster since Saitama sees him as a human and more importantly a hero who just started by shedding his mask and thus the start of his road of becoming his own Ideal Hero by helping him escape the public eye.

Drive Knight is disguised as G5

Drive Knight disguised himself as G5 in order to spy on the Monster Association. Both are robots(?) who possess a single glowing eye, so it'd probably be a pretty easy disguise.

  • Jossed. Drive Knight and G5 appear separately in the same place, though they may still be connected.

Orochi is only a meat puppet controlled by Psykos to help her lead the monsters.

  • Jossed. Psykos and Orochi butt heads before fusing together, showing they are separate entities with lots of pride.

Dr. Genus' secret in his basement is a gymnasium

When Zombieman asks him to help remove his limiter, Dr. Genus just tells him to work out as hard as Saitama. Maybe Zombieman will even end up doing the 100 push-ups, 100 sit-ups, 100 squats, and 10km run.

  • It might not work with Zombieman though, due to his advanced regeneration. Would his muscles even be able to grow if they were repaired the instant they were strained?
  • Jossed. It's a resurrected Carnage Kabuto.

    Saitama's Power Theories 

Saitama's explanation of his powers is correct.

Saitama really did just work out hard enough to gain his powers. This is a world where eating too much crab can turn you into a monster - it wouldn't be far-fetched at all for Saitama to achieve this. He's just telling the truth.

Saitama's power is reversing cause and effect on attack and defense.

Like Lancer's Gae Bolg from Fate/stay night, he does something; and reality warps so that the effect is that his punch crushes people, or their attacks on him aren't as effective; regardless of his physical strength. Similar to Lancer; the ability has an Equivalent Exchange on his luck. Unlike Lancer, he doesn't get hurt; however people never recognize what he does. (Because they can't rationalize the shift in cause and effect.)

Saitama's punches are a result of Newton's third law of motion not affecting him.

Alternative to the above, why Saitama's strength is so immense is that he has the ability to actively (or passively) negate the third law of motion, so when he punches something, there is no equal and opposite reaction that is repelling said punch.

Saitama's power is unconscious gravity/mass manipulation
Lots of little things led me to this idea:

  • His training regimen never got easier, he unconsciously increased his mass/weight so it would always push his limits.
  • Violations of laws of motion, when he causes mass destruction in one direction there should be an equal and opposite reaction, there isn't.
  • Tatsumaki remarked on how heavy he is.

Saitama's power is just the ability to one-hit kill anyone or anything.

The ability manifests itself as super-strength, -speed, etc. because it's based on Saitama's impressions of superpowers from the anime/s he saw as a kid. If it had been a different person (say, a videogame nerd like King), that person would have gaming-themed superpowers, for example (simmilar possibly to Han Jee-Han's?). Thus, it's a sort of eldritch power, and maybe You Cannot Grasp the True Form.

A side theory could be that he's had this power dormant inside him since birth, only surfacing when Crablante attacked, which drove him to become a hero and find a "proper" (so to say) way to channel it (=letting it manifest as typical Flying Brick-type superpowers).

(Up for debate if Saitama genuinely wanted to be a hero independently of his powers or if they subconsciously influenced his decision, but if one sided with the latter, then one could postulate Saitama's problems with heroism [such as lack of popularity, badmouthing by literally everyone, etc] as fate/destiny/the Powers That Be/what have you deliberately screwing with him so as to stop him from being a hero, since he is by far too OP.)

One reading of how Saitama got his godlike abilities, given the very Buddhist connotations of his baldness and training regimen, is that his unwavering commitment to being a hero solely for the sake of being a hero is where his powers came from.

Saitama is a Normal Fish in a Small Pond

The city is just pathetically weak. The reason for the limiters is to allow weak people to live in peace.

Saitama can fly, he just doesn't know it

Some of his moves, such as changing direction quickly in mid air, would only be possible with a flight-like ability. But because he doesn't think he can fly he doesn't do knowingly.

Saitama does have special powers, but they aren't combat-related

Instead, they drastically magnify the ability training has on him, meaning that a normal person could be as strong as him if they did his workout equal to however many times his power multiplied his memetic training regiment.

Saitama's powers were granted by "God"

As in the being called God by Homeless Emperor. Combining its ability to grant vast amounts of power at will as well as its ability to do this and communicate through psychic links, it could well be God is the source of most of the monsters in OPM's world. This WMG assumes God's psychic powers make it aware of humans with spectacular levels of obsession with something. Be it crab for Crablante or being able to destroy evil in One Punch for Saitama. Banking on the idea that obsession breeds greed or some similar Humans Are Bastards philosophy, God grants powers and transformations to these humans in-line with and in proportion to their obsessions. So a gluttonous man obsessed with eating crab becomes a crab-monster and goes on a rampage. God hoped Saitama would have been the ultimate monster, becoming drunk on power and scornful of his new appearance to the point of causing unstoppable mayhem. Instead, Saitama's transformation was turning bald and he just became bored with his strength instead of using it with abandon, as he just wanted to fight monsters instead of be strong for its own sake.

Saitama is a glitch in the universe, and OPM was supposed to be a shonen starring Garou and Genos with Boros as the Big Bad.

Adding to a WMG above, Saitamas training should have killed him but instead the universe glitched and he lived becoming infinitely powerful. If things had gone as they should have all the monsters he would have killed were instead brought down at a much higher cost by weaker heroes. By the time the OPM story starts the world would probably be in some pretty dire straits.

Enter Garou who in a timeline without Saitama is in a world where people and heroes are constantly being killed by nigh unstoppable monsters. Instead of being a hero hunter he becomes a monster who hunts monsters and seeks to be the strongest. He is joined by the Demon Cyborg Genos who seeks revenge and justice.

Over the course of the story Genos eventually begins to sway Garou into actually just being a hero by the time the Boros arc hits. Garou fights Boros into his second form before awakening to the power of justice. Finally giving Boros the fight he was looking for.

Saitama's power is a result of him transcending the level of anime hair and going bald.

As we all know from shows like Dragon Ball Z, the longer, wilder, and more fearsome a person's hair is, the greater their strength. In training, Saitama achieved Saiyan level of power, and transcended it; but the strain was too much on his hair and it fell out. The level of power in his body is too much for his hair to register. Now he is permanently stuck at a level of power that surpasses even the Saiyans, doomed to never have a hair on his head again.

Whatever power Saitama has, it's NOT in the OPM universe

If the word is going to be believed, a full-force punch of Saitama would contain half the energy of the Big Bang. Theoretically speaking, that would mean Saitama would contain more power than the force used to create the universe. Since a system cannot contain more power than it's needed to create it, his entire universe would have been crashed by the mere presence of him (a system would have to account for potential energy that's always existing). Since that isn't happening, as we can see, that mean the source of his power must come from outside his own verse, probably via a pathway that he could control the output. (Which would explain the delicate control he has to live an ordinary life). That's assuming this is and it's half the energy used to create his universe (if it's bigger than ours).

  • Jossed; at least, the first part. The Big Bang comment about Saitama is a rumor, ONE never said that.

Saitama is actually an NPC

We all know he supposedly gained his massive power through his "training" which can't even be comparable to workout regimens for professional athletes or other heroes in the world itself who don't have nearly his strength. But think about it, he doesn't have any of the "special" aspects that most of the other heroes and even villains of his world have. He has no grand goal in life. He has no tragic backstory. He has no real desire to help people. He was a regular salaryman who just decided to become a hero as a hobby for the thrill of the battles he'd get to fight. He only decided to become a hero after he happened to save someone during a monster attack once, meaning that he was one of the normal citizens needing to be rescued at one point. And that's just it: he was a regular unimportant nobody. He was an NPC. It's been mentioned that he broke his limiter and gained such a level of power because of his training, and while the training may be lackluster for the real world or even other heroes in his world, for an NPC, it was above and beyond what any of them should be capable of. Non Player Characters are generally there to either fill the background or be killed off to show how much of a threat something is, either in terms of power or just how evil they are willing to be by killing innocent people. Saitama was an NPC who stepped out of his role as such. He went beyond his limits as a background character. That's why he's so powerful.

Saitama will come up against a monster who can take his consecutive serious punches.

At which point he'll unleash his super serious punch.

Blue will fight against Amai Mask

Eventually, Neo Heroes will find Amai Mask's whereabouts and send Webigaza to fight him. However, Blue will try and face off against the monster hero himself as a way to prove himself. What follows is a huge Curb-Stomp Battle with Amai Mask criticizing everything about Blue and tearing both his armor and dignity to pieces due to considering him a boring and unremarkable hero.

    Story Theories 

Saitama will eventually find a challenging enemy... Who will beat the living shit out of him because he's too strong.

Because honestly, the irony would be insane to see.

  • For Bonus Points, this will be during his absolute Darkest Hour-The Big Bad has defeated all the other heroes, Genos is severely injured/dying (again), Saitama ignores the Big Bad's bragging and punches him to oblivion-and fails.
    • For extra Bonus Points, the bad guy's strength will come from a slightly better version of Saitama's training regimen: 110 push-ups, 110 sit-ups, 110 squats, and running 10.5 km every single day, or something like that.
      • For extra, extra Bonus Points, it will be Blast.

Saitama will eventually fight against a villain with Intangibility

The Logical Weakness of someone who can end fights with one punch is being unable to land a punch on his enemy. Thus, Saitama would probably have trouble with an intangible man...until he punched the intangible man's feet, which are conspicuously not falling through the Earth. Or maybe someone else pulled a Big Damn Heroes on Saitama for once? There's a lot of interesting directions ONE could take this in.

  • Maybe he won't consider it a fight, unless the intangible person has other powers to help him fight then there won't be a point for them to fight. Saitama wants to fight someone who needs multiple hits, not someone who he can't fight.
    • Or rather, he wants to fight someone who can actually hurt him. In his dream sequence, he was killing the Subterraneans with single punches, but they also managed to hurt him as well. Saitama wants to feel pain again.

The series will end with Saitama fighting "God"

Again, the being Homeless Emperor calls God. A being that is able to grant and tear away vast amounts of power with ease, as if powers like creating tiny stars that explode on contact are just a drop in the ocean of its strength. It's very easy to assume it will be OPM's first and possibly only God-level threat, because it is called "God". This will seem like the fight Saitama has dreamed of, where the real threat of injury and death will make him feel alive again. Unlike most if not all fights in OPM, this fight won't just be two characters throwing themselves at each other in kickass ways. It will be a more traditional Shonen fight, with Saitama having to actually think about how he uses his strength and come up with tactics and mindgames to overcome God's strength. As well as the emotional throughline not being about Saitama being dissatisfied that he's found another Boros, but that for the first time in his life he is scared witless and doubting his ability to win a fight, because he is fighting God, who I assume is the very being who gave him his powers in the first place.

The series will end with Saitama fighting actual God

It will play out similar Asura's Wrath: God reveals that he's responsible for much of the Earth's suffering (or maybe is just too lazy to do anything about it), Saitama gets pissed, they fight and Saitama either A) killing God, B) dying in the attempt, or C) both.

The story will end with Saitama losing his power and regrowing his hair.

The story comes full circle, and Saitama gives up his hero hobby to live a normal life once again.

  • Alternatively, Saitama starts his training again to go through the whole journey one more time.

Saitama will die after using his full strength.

A tragic ending, as Saitama is at last fulfilled in his hero hobby.

The series will end with a Title Drop

Specifically, it will end with Saitama getting the recognition he's been looking for within the Hero Association. He'll be promoted to S class, and his hero name will be changed from "Caped Baldy" to "One Punch Man".

  • I think the intro is the description of Saitama after he was revealed to the whole world. He looks serious during every fight, there is no goofiness involved. And the constantly changing setting may imply, that he decided to walk the Earth to find a purpose.
  • The title in Japanese transliterates directly to "Wanpanman," which is clearly a pun on Anpanman. It doesn't discount this guess, but it suggests there is a reason for Saitama not being known as such in-universe other than it'll come up later.

The opening shows how people will remember Saitama after the show

I always wondered why his expression is so grim while fighting enemys he can oneshot. I think after he finally receives the praise he deserves, he will find it boring, and start wandering the earth searching for a worthy opponent. The opening shows how the people remember him, a grim hero who does not enjoy fighting.

By the time Genos finds the mad cyborg that destroyed his village, he will vastly outclass him

Think about it: Genos has been shown to ask Stench to improve him every time they meet up. Genos has also be shown to fight on even terms with city destroying monsters (e.g. Sea King), and a power level far below that would be enough to destroy a village. Therefore, it seems likely that by the time Genos finds the mad cyborg, he will be far above him in terms of strength.

  • For bonus points, Genos will destroy the mad cyborg with one punch.

Genos will become a monster.

Genos has the makings of a monster already; he is a human who transformed his body in order to become stronger and pursue his obsessions. When Genos meets Sweet Mask, he is disturbed by how similar they are, and admits that without Saitama he too could be a violent maniac. His hero name is "Demon Cyborg", and some of his upgrades such as the post-Elder Centipede armor are monstrous and inhuman in design. Genos was even hidden in this spread of monsters during Dr. Genus' monster-explanation to Zombieman (though he was removed from the volume release; possibly because it was too obvious of a hint). It's possible that Genos' inferiority complex to Saitama and his intense desire to become stronger will someday push him over the edge, and he will go mad with power just like the "mad cyborg" he so despises. Dr. Kuseno warns Genos not to push himself too hard, implying that the good doctor is aware of Genos' struggle and what he could become.

  • Or maybe Genos is already a monster. What if Dr. Kuseno put the brain of a monster into Genos' cyborg body in order to rehabilitate it into a human? It would make his connection to Sweet Mask more meaningful too, since Sweet Mask is also a monster in human form.

The Hero Association will become a dictatorship.

Let's see. The H.A. is going out of its way to make the police look like fools and useless fodder. The Heroes are slowly becoming the first and last line of defense with no military units or government organizations in sight. Metal Knight is producing bigger and badder weapons "for peace". They built a superfortess on the ruins of a devastated city that no civilian is allowed access to instead of making it a super bunker for resident civilians. Metal Knight has a walker ready made to make the fortress in 7 days as if he KNEW that the city would be destroyed. The H.A. seems more concerned with public appearances and naming superheroes instead of protecting the people. The great prophet conveniently dies right before giving the details to the upcoming catastrophe causing confusion and panic while under the direct watch of the H.A. who should have been monitoring her the entire time. Mysterious Beings have started popping up everywhere with seemingly no explanation and people with super powers are inexplicably popping up everywhere as well. Plus Drive Knight tells Genos that Metal Knight is his enemy. Something fishy is going on.

The B-Class would've eventually become stronger than the A-Class and not even realized it.

Important disclaimer: NOT. COUNTING. SAITAMA. They were led by someone who would easily make it into the top 10 of A-Class, and it's made a noticeable point throughout this Wiki that her keeping the B-Class #1 spot holds back others from advancing to A-Class as well. It's entirely possible that a good chunk of the top ranks of the B-Class was stronger than the bottom of the A-Class before Fubuki made her decision to finally advance.

  • Somewhat confirmed, as this was apparently a problem when the Hero Association was created. Heroes such as Metal Bat, Superalloy Darkshine, and Watchdog Man were some of the lowest-ranked C-Class heroes for a while, even though they were killing Demon-level threats left and right. This led to the formation of the S-Class heroes.

One day King will be forced into a battle he can't bluff or wriggle his way out of.

It will be against a Mysterious Being who can only be defeated through a video game.

  • This sort of happened already in a bonus chapter: one of the members of the Blizzard Group is a former pro gamer and King has to beat him for Saitama's sake. King wins, of course.

Sonic will become Saitama's equal.

  • Sonic's desire to beat Saitama will cause his body to transform, like the mysterious beings who become monsters due to something like eating too much crab. He'll gain Saitama-level strength and speed, but will become bald too.

Mumen Rider and Saitama will get a role reversal at some point

At some point there will be a monster that simply can't be beaten by physical force but rather some metaphysical thing can hurt it, perhaps it is some immaterial demon harmed by the pure of heart, or maybe some being protected by a prophecy that only the greatest hero could defeat it, so it incapacitates all the S class heros thinking it's safe, and it seems like the day is saved when Saitama shows up and punches it, only for his blows to do nothing, after all while hes nice hes only a hero for a hobby so hes hardly the most upstanding person, but hes still super durable so the monster cant hurt him either, so Saitama takes the role of distracting the monster and intercepting its attacks to prevent it from hurting others(while having the time of his life) until Mumen Rider arrives, and everyone is surprised when the monster explodes after one justice crash, because while Mumen Rider is far from the strongest hero he is the greatest in terms of resolve and morality

In the Murata manga, Garou will be wearing a monster costume for the Monster Association finale.

The massive redraws of Phoenix Man vs. Child Emperor make me think that the ideas of "Phoenix Space" and the connections between costume-wearers will come back. Maybe Garou's awakened/monster form will be revealed to just be a costume too, one that he willed into existence or something, idk. In the original webcomic, Garou is even broken out of his monster form by Saitama as if it's a shell or a suit of armor, not like it's part of his body. It makes sense thematically too, since Garou is only playing monster, and is a good person at heart who could never fully become a monster.

Black Sperm will have a redemption arc

I believe that Black Sperm has a serious inferiority complex. He wants to be strong and to crush his opposition, he hates being looked down upon, and he's always worried about numbers such as his cell stock. He is very insecure, and secretly has a broken heart. I think that we will hear more about this when we eventually learn his origins, and that he will have some sort of change of heart while living with Saitama to become a good guy or at least a neutral party.

  • Having psychological issues doesn't necessarily make a character sympathetic. All we've seen of Black Sperm shows he's a vicious sadist. Having an iferiority complex won't change the fact that he's a horrible person.

The Hero Association and Neo Heroes will eventually merge

Both organizations merge together with Sitch as the new head due to being the most moral figure of the heads.

  • The story ends with the Neo Heroes failing once it turns out that the staff is comprised of the corrupt figures of the Hero Association who in turn causes it to repeat the same mistakes which caused the Hero Association's original fall to happen. The Hero Association, on the other hand, now has more moral figures taking the lead which causes them to gain a resurgence in popularity and focus thanks to a greater focus on saving civilian lives.

Now that his monster form is revealed, Amai Mask will:

  • Return in a more human form which resembles his original ugly face and return as Secret Mask. Deciding that it doesn't matter how he looks so long he remembers that true beauty comes from within.
  • Create a new Monster Association in order to try and get Saitama to kill him to improve the PR of the Hero Association.
  • Alternatively he creates a heroic Monster Association comprised of monsters who want to live alongside humanity, such as Armored Gorilla.

Amai Mask will save the life of Metal Bat's sister

He will save her when she is in danger. This also causes Blue to try and kill him again only to butt heads with Metal Bat who points out that he just saved his sister. This may also result in Metal Bat defecting from Neo Heroes.

Saitama will end up defending docile monsters and former villains from other heroes

Since the series began, we've seen Saitama's influence change for the better how Genos, Fubuki, and King all see the world. He's also changed the behavior of villains such as Dr. Genus and Garou, and even monsters such as Armored Gorilla. He easily aligns himself with Manako in the Monster Association base; no problems having her around. After the Monster Association arc, Saitama even has the docile Overgrown Rover and Black Sperm living nearby. However, other heroes are not as tolerable of monsters and villains. Saitama had to save Garou from Sweet Mask, then ironically had to save Sweet Mask/Beauto from the public. He also has a genuine interest in the Hero Name Victims Association, and while they are clearly a joke, they highlight something important - monsters are not the only ones bullied by those in power.

It's possible that Saitama will begin assembling a posse of peaceful or otherwise docile monsters and will have to defend them from heroes who wish to do them harm. This would also ironically end up fulfilling Garou's goal of protecting the little guy, which he believed Saitama was incapable of doing during his Motive Rant.

  • This is supported by the redrawn version of Chapter 100, which retconned Phoenix Man into surviving his battle with Child Emperor. Saitama could have a group of monsters and villains at his side, including: Dr. Genus, Armored Gorilla, Manako, Phoenix Man, Black Sperm, Overgrown Rover, Sweet Mask, Garou, and possibly more.
  • Maybe Garou will be the one leading the posse himself. It would give him a very real opportunity to finally look out for the little guy like he's always wanted to.

The history of the Hero Association Amai Mask explained is partial foreshadowing to what will happen to Neo Heroes.

According to Amai Mask, the Hero Association originally had no exam and everyone was allowed to join, but after only 2 months only one out of ten heroes remained. Considering the amount of injuries, near-deaths, and potential actual deaths, it is highly-likely that hundreds of Neo Heroes will quit with the only ones staying being former pro heroes or others that are experienced in the field.

The Organization is one of the sponsors of the Neo Heroes

Neo Heroes has shown to have advanced facilities and technology from an unidentified source, and various staff members were shown to have augmented themselves. Since it naturally does not come from Metal Knight, the only other organization with lots of mechanical resources would be the Organization. They are funding and secretly controlling the Neo Heroes to cause the fall of the Hero Association and take over the world.

  • This makes sense when Child Emperor notes that the Neo Hero battle suits are similar to Metal Knight's technology; G5 took a bunch of data from the Metal Knight drone during the Monster Association arc and sent it back to the Organization. They made the suits with Metal Knight's tech without his permission.

Garou is going to kill "God"

There's been an awful lot of hype about "God" in the Psykorochi chapters - Psykos talking about seeing it while she joined with Orochi, all the shots of Tatsumaki with the cracked moon behind her, the giant being in the bottom of the Monster Association base. But would they really steal Garou's moment of glory from him and replace him with "God"? I don't think so. I believe that "God" will appear only to get killed by Garou in one punch. After all, he does state that he has the "God Slayer Fist" when he fights Saitama later. Not only that, but it would hit home some of the parallels between Saitama and Garou; just as a big fight is coming up and things are looking dire, it is suddenly ended in one punch... but not by a hero.

ALL superpowers are Psychic powers
all humans and indeed all life possesses psychic powers, Espers are just the ones that can consciously control it, but others can subconsciously tap into it, those with exceptional discipline and will like Metal Bat and Bang subconsciously strengthen there body, Geniuses like Kuseno and Child Emperor achieve hightened mental states(and thus there creations while not directly powered by psionics are still derived from them), others like pig god develop unique powers, even monsters are just the result of someone uncontrollably activating such powers and giving themselves over to the darker side of there mind, allowing it to warp there body threw Biokinesis, which is why it cant be induced involontarily and why it reflects ones obsession

this also explains why Psychos, one of the most powerful psychics on the planet, would be the one to figure out monsterfication, and also possible why she didn't choose to undergo the process herself, since it would draw on her psychic energy rather then gain power it it would simply be split between her psychic powers and her now monster ones, overall weakening her, this is why she chose to fuse with Orochi instead, rather then dividing her existing powers it would simply add them together

The three centipedes, two cicada, and Autumn Dragonfly are all part of an unseen Tribe of Insect Folk
they all appear extremely similar, being giant insects of some sort with humanoid faces on there forheads, and all but the dragonfly have older more powerful individuals of the clearly the same species, but Junior Centipedes comment on thinking he was strong until he met Senior/Elder Centipede would imply there unrelated and only met later, considering how unlikely it would be for 3 completely unrelated people to take on the exact same monster form its likely that like the other tribes they are a naturally occuring species rather then humans turned monsters, although one that has likely lost its king(or queen?) considering they appear to be scattered and not united like the other tribes

Neo Heroes will find Amai Mask
They will then send their heroes after him only for him to completely defeat them since this is a threat not engineered by them. For extra irony, this situation will mirror the Hero Association's situation with Garou.

It will be discovered that Monsterization and becoming a Hero are both the exact same thing.
The only difference between the two is a persons morality and emotional state when the process activates, people who are already bad and angry when it activates gain power but also mutations, whereas good people with good intentions gain power, but little to no mutations, that's why once the association was formed, suddenly there were people around who suddenly had the power to fight monsters.

    Character Theories 

Saitama is a masochist.

Despite Boros being the strongest fight Saitama had to deal with so far, at no point does he show he's enjoying it. While in the dream fight with the subterranean people and the fight with Crablante, he is show to have a fire in his eyes. In the later two fights, he defeats his opponents in one hit. Why does he enjoy these fight more. Because both opponents hurt him. Saitama isn't actually searching for an opponent who can survive multiple hits, he wants an opponent that can hurt him.

Saitama has brain cancer.

Saitama has brain cancer, and is undergoing chemotherapy. That's why he went bald. All of the his of the adventures are hallucinations.

Saitama is dead.

Not in the sense that he's in an afterlife, but rather that his training killed him and what we're following is his corpse animated by his own willpower.

The whole series is Saitama's dream

Near the beginning of his training, he overexerted himself and passed out, and everything since then has been a dream. In the end of the series, he'll easily defeat the ultimate enemy, then wake up, and realize that maybe being so strong isn't such a good thing after all, so he gives up on his training and goes back to being a normal person.

Saitama is the threat to humanity foretold in Shibabawa's prophecy

Saitama will eventually face someone powerful enough to give him a fight. However, if he goes all out against them, their fight will destroy the world (as seen in Saitama's dream-fight against the Subterraneans). Saitama will be faced with the dilemma of finally finding fulfillment and keeping the world safe - he won't be able to have both.

  • Fun idea, but Saitama specifically chides Boros for razing a city in his search for a good fight. I don't think Saitama would even consider risking human lives for a good fight.

Blast is...

  • ... Dead All Along. He's so reclusive that it wouldn't appear out of the ordinary if he didn't show up for a while.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... not real. He was made up by the association so the higher ranked S class heroes would have a goal to work hard for. Any characters claiming they've encountered the guy have actually met an actor playing the role. Probably Jossed, as Tatsumaki met him 15 years before the Organization was founded.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... just as strong as Saitama. Because Victory Is Boring, he's resigned himself to accept that nothing will ever challenge him and given up on heroics altogether, explaining why he never shows up.
  • ... a woman. Specifically a Distaff Counterpart of Saitama, and also bald. Really doesn't seem so. He looks quite masculine in Tatsumaki's flashback.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... a Person of Mass Destruction so powerful he could potentially destroy any threat... Earth itself included.
    • Building off that, Blast is a pyrokinetic on the level of an (adult) Charlie McGee.
  • ... Saitama. He was given the #1 S-class position and title of Blast by the butt-chinned man who started the Hero Association, but couldn't find a way to contact Saitama (due to not knowing his name) to inform him. Thus why no one ever sees or knows anything about the man named "Blast".
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... Someone who looks like Saitama did back then, got mistaken and just rolls with it. That's why he never shows up for heroic deeds. The flashback says Tatsumaki met Blast 18 years ago. However, Blast could be Saitama from the future what with the similar costumes, albeit with a few differences. It's kinda hard to tell since it hasn't been redrawn yet.
    • Plus, his Kirk Summation to Fubuki sounds strikingly similar to Blast's advice to Tatsumaki years ago, about not relying on weaker people and how eventually they'll meet someone stronger. I mean, look at this, parts of it are practically word-for-word the same:
      Saitama: (to Fubuki) ...When a monster stronger than you shows up, none of your subordinates will save you...
      Blast: (to Tatsumaki) When the time comes, don't go expecting someone to come save you.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... Saitama's father. The reason he's never seen is because when Saitama's gained his powers, Blast lost his. Given how Tatsumaki's flashback showed that Blast has a lot of Saitama's traits, mannerisms and even shares a resemblance in appearance.
  • ...Bang and Bomb's third brother, following the same naming conventions.
    • Unlikely, given how much younger than them he seems in Tatsumaki's flashback but still possible.
  • ... a cyborg. Specifically, the cyborg who destroyed Genos' hometown and killed his family.
  • ... invisible. He's been following Saitama around the entire time, quietly observing.
  • ... Metal Bat's younger sister, Zenko.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... someone Saitama might not be able to defeat, should he reappear one day.
  • ... Orochi. Psykos claimed that Orochi was a fighting genius who had become disillusioned with humanity before she met him. Maybe Blast got sick of saving people and became a monster to change things up.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... never around because his training made him bald and he's too ashamed to be seen anymore.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • This Hero Association worker. He does bear some resemblance to Saitama before he became bald.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... actually a spirit that possesses a host, lending his host tremendous power. He was in an old host when he helped Tatsumaki but degradation of his host's physical form forced him to move on to a new body. The identity of that new host? Saitama. Blast needed to find a new host right when Saitama was training to become a hero. Blast possessing Saitama is the real reason why Saitama became ill during his training, why Saitama's hair fell out, and why Saitama became so strong. Also, the ultimate final villain of the series will have been trying to exterminate Blast, who has been his enemy for who knows how long.
  • ... Mumen Rider. Mumen never shows his face, but has been seen with hair similar to Blast. Perhaps Blast is Saitama's next "phase" or an inversion - so ridiculously powerful that he wishes to be normal again, resulting in a total loss of powers. He still needs to be a hero, though, so he hangs out in Class C. Probably jossed as Mumen Rider attended the same school as Saitama as a kid. At that time, Blast would have been an adult.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ... a fraud. He's not actually that powerful and most of his "heroic" deeds are either rigged or the result of him stealing credit for the work of other heroes. He stays out of the spotlight to avoid arousing people's suspicions.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ...the "God" being. Blast broke his limiter and became so powerful he transcended humanity, transforming into a being of pure power (remember why Dr. Genus said limiters exist: to stop people from going mad). Now his goal is to put the rest of humanity to the ultimate test and see if they can truly protect themselves.
    • Jossed. He shows up for a second in the manga during the Monster Association battle.
  • ...the astronaut in the Chapter 139 illustration. He was an astronaut before he was a hero, and he gained his powers from "God" while exploring in space (maybe he found the cube up there).
  • ...fighting God in the afterlife. The three teammates of his we see are a woman who's a seer, a one-eyed alien like Boros, and a lion-headed man. What if those are Shibabawa, Boros, and Beast King?

The secret behind Blast's rank and power

Like Saitama, he trained himself so hard he developed superpowers that outclass every other S-Class hero combined. His workout regimen? 99 push-ups, 99 sit-ups, 99 squats, and a 9km run, every single day, except Sundays. If he'd just pushed himself a little bit harder... well, who knows what would've happened?

Genos doesn't give out his specs specifically so nobody will analyze them.

When registering with the Hero Association, Saitama offhandedly asks if there's even a point to Genos participating in the physical exams, if instead he could just give the Hero Association his technical specifications. Genos is hesitant to answer and decides not to, while Saitama waves it off. Later, we see Metal Knight test-firing his new weapons, then Genos being told Metal Knight is not an ally, and finally Metal Knight analyzing Boros' ship, using the data to reinforce the Hero Association's headquarters. It may well be that Genos consciously decided not to give out his specifications because he worries that it can be replicated or analyzed for weaknesses by his enemies, and is unknowingly protecting himself against Metal Knight, who might be the cause of his trouble past.

  • Alternatively, Genos doesn't give out his technical specs because he doesn't know what they are. He knows the limits of his abilities and strengths in combat, but as he isn't a mechanic or roboticist or anything like that, he just trusts Dr. Kuseno to repair and rebuild him.

Genos is the android who destroyed his village.

Years and years ago, Genos was a villainous android who decided to attack a village of defenseless people. Dr. Kuseno, being a genius, manages to incapacitate him and decides to rehabilitate him, realizing how useful that much power could be to the world. Genos has false memories implanted within in his head (that he grew up in the village he attacked) and is awoken by the doctor to fulfill his new role as shackled protector. However, Kuseno is surprised by the androids apparent age and reverent attitude and grows to care about him.

The story of the other android came later when Genos asks where his family is, it was something Kuseno makes up to avoid the truth.

  • As noted below under the "Genos was never human" guess, jossed since if that was the case, we wouldn't have seen any muscle on his face/spine or ribcage when the Deep Sea King's acid melted him, meaning he's a cyborg that's more robot than human at most.

Genos is from the Ninja Village, and Blast is the Mad Cyborg

  • Genos said his village was destroyed by a cyborg when he was young. Blast also happened to have destroyed the Ninja Village back in the day, at a time when Genos would've been young. Maybe it was the same event? Does make one wonder why Dr. Kuseno chose Genos to save out of all the Ninja Village children though.

The mad cyborg is the "Blast counterpart" to Genos

So you know how Blast resembles Saitama and the two seem to have a lot in common? Maybe the mad cyborg resembles Genos and has a lot in common with him. Maybe the mad cyborg was Blast's companion and disciple in the same way, but he went mad with power. He could be a dark reflection of the unhealthy aspects of Saitama and Genos' relationship.

Metal Knight is/invented the android who destroyed Genos' village.

He seems to care more about making strong weapons than protecting people, so he's probably the kind who wouldn't care if one of his experiments went out of control and destroyed a village. The way Drive Knight specifically warned Genos about him makes me think they're being set up as opponents later on. Plus, before meeting Saitama Genos was a lot like him, only worrying about becoming stronger and better, so they could be foils.

Related to the above theory: Drive Knight is the cyborg that Genos is looking for

Drive Knight tells Genos to watch out for Metal Knight, who Drive Knight probably also has a beef with. Drive Knight will wait till Genos and Metal Knight fight and wound each other before finishing them off.

Metal Knight and Dr. Kuseno are related.

Both are slightly older scientists who specialize in robotics. Could be a Bang and Bomb situation.

  • Adding to that with the theories from above, it is subtly implied that they are connected in one way or another to the cyborg that destroyed Genos' hometown due to being specialize in different fields of said robotics.

Kuseno was the one who created the cyborg that destroyed Genos' village.

I find it way too convenient that Kuseno a master of cybernetics just showed up. I think he created the rampaging cyborg and feels at least somewhat responsible for whatever went wrong during the body modification and is now hunting the cyborg down

Metal Knight and the Hero Association are secretly part of an organization creating Mysterious Beings

Metal Knight is a jerkass from the start as he uses a situation of a city-destroying asteroid to test out some new weapons without actually saving anyone. His actions later on include avoiding combat, looting alien technologies, and building a super-fortress for the Hero Association. That also makes the Hero Association suspect as without the Monsters there would be no need for Heroes or for people paying the Heroes. What do they need with a Super-fortress anyways? There is already evidence that the Hero Association is supplanting city organizations like the police with Heroes. the Hero Association itself seems full of weak and/or jerkass people with a few strong and/or real heroes so they're nearly useless against any threat unless Saitama saves them.

King actually does have a superpower: luck

He may not be the most badass superhero alive, but he's been in so many situations that could've splatted him, and yet managed to survive from several timely factors, and even gotten a terrifying reputation he can save his own life with more than once, it all seems to be a little too much for a coincidence. So perhaps something within him is organizing these coincidences, letting him leech off others' fame for himself. He and his luck don't seem to agree too much on what they want, but it'd seem that's his actual power.

  • Either that or King is a Project Empath; he can channel his fear into others.

Boros's prophesied opponent wasn't Saitama.

Boros was specifically promised an enemy who could fight him on equal terms. The problem is, him and Saitama aren't equal. Saitama is thoroughly out of his league, and the only reason Boros lasted so long in their fight was because Saitama wasn't bothering to seriously fight back.

  • Maybe Boros's promised opponent wasn't Saitama at all. He was supposed to fight Garou. Of special note, Word of God has stated that a fight between Boros and full-power Garou would be one hell of a battle.
  • His destined opponent could have also been Blast, of course.

King will eventually get superpowers that enable him to channel his skill at video games into real combat
  • And this instantly rockets him up to one of the strongest characters in the series. I mean, you can become a monster by eating too much crab and become a walking Story-Breaker Power doing some mild exercise for a couple years, so is it really too far fetched?.

Metal Knight has Boros' remains

Metal Knight was the head of cleanup after the alien invasion. We see Boros' body is somewhat intact after his defeat, and Saitama simply leaves him in the wreckage. It's very possible that Metal Knight found Boros' body and has been studying it. This could benefit his robots greatly, or even lead to a Mecha-Frieza situation with a resurrected cyborg Boros.

Tatsumaki is the foil of Saitama.

They have some similarities:

  • Both have the ability to change art styles
  • Both look non-threatening, but have incredible power.
  • Both have a weaker student (Fubiki and Genos)
They also have tons of differences.
  • Saitama had a normal life before being a hero, Tatsumaki had a traumatic one.
  • Saitama is calm, Tatsumaki is constantly moody and easily annoyed.
  • Saitama is low ranking and gets no respect, Tatsumaki is ranked #2 in the association.
  • Saitama fights entirely physically, Tatsumaki uses her psychic powers.

Tatsumaki would be a Shipper on Deck for Saitama and Fubuki

  • Because a) She's really overprotective on her sister and b) her mind jumped into the strangest conclusion.
  • Saitama already declared himself as neither underlings or friends of Fubuki. There's no way Saitama would let her do what she wanted, and she had no chance against Saitama. She would lose against Saitama, but then wondered why he'd go so far just for an 'acquaintance'. She would take a wrong conclusion that Saitama is Fubuki's 'special person'. She would approve it since Saitama's strong enough. Hilarity Ensues.

Puri-Puri Prisoner is a Yaoi Fanboy

Would THAT be surprising?

The "God" who gave Homeless Emperor his powers is also the one who created Vaccine Man

Homeless Emperor and Vaccine Man both wanted to Kill All Humans because they saw them as threats to the Earth, and they both have similar ball of light attacks.

  • Word of God states their light attacks are made of the same energy.

Licenseless Rider scored exactly the opposite of Saitama on the Hero Association exam

While Saitama scored perfectly on the physical examination, his utterly lackluster motivation (to be a hero for fun) caused him to score poorly on the written exam, which knocked him down to Class C. License-less Rider is Saitama's Foil: physically unremarkable, but his perfectly heroic personality and intent allowed him to ace the written exam and attain a Class C rank.

Licenceless Rider has the potential to One-Punch

If we accept the theory that Saitama's power comes from his constant workouts, due to his obsession with being the strongest, then it's logical to assume the constantly on-the-go Licenseless Rider has done all the training required. Furthermore, he and Saitama are the only ones who regularly express a belief in doing the right thing for the sake of helping others (with LR lacking Saitama's more selfish attributes). Therefore, its only because he doesn't have that obsession with being the best that he can't do it. If he did, he'd be able to win any fight with a single punch.

  • Not a punch. With all he cycles, he might be better suited for kicks.

"God" intends to reset humanity to balance it out with nature

The humans have grown too powerful and their societies too corrupt. All other species, such as the Seafolk and Subterraneans and all their powerful kings, have been wiped out by the overwhelming strength of humanity and their heroes. Maybe it's time "God" humbled the humans for another couple thousand years, and that's why he sent Homeless Emperor to wreak havoc.

  • Additionally, Word of God has stated that Vaccine Man, Homeless Emperor, and Monster!Choze all use the same kind of energy attacks; what do those three all have in common? A moral mission regarding the future of the planet. Vaccine Man wanted to destroy humanity to save nature from pollution, Homeless Emperor wanted to destroy humanity due to their moral corruption, and Choze wanted to kill everything he deemed "unworthy" in order to make a perfect world. They were all agents of nature, and once they are all defeated (plus anyone else nature sends in the series) God itself will appear to reset humanity. Saitama will have to fight to save all of humanity. This leads back into the theme of nature vs. humanity that's present throughout the series, from the House of Evolution to the idea of limiters.
  • Maybe even the giant meteor was God's doing too - it was trying to pull another dinosaur-extinction-like apocalypse to bring the humans back down again.
  • Supported by Sweet Mask's account of the One-Punch Man world's history: the many nations of humanity warred way too much, and by the time they started being friendly again, the planet was gravely damaged by the constant conflict. This resulted in unsafe conditions and dangerous monsters appearing all over the world, forcing humanity to come together into one giant nation on the supercontinent. It seems "God" has been planning the punishment of humanity for years and years!

Blue has no powers

Blue is the son of Blast, allegedly the greatest hero in history - but he has no powers of his own. To make up for this, he uses advanced technology. Maybe he gets it from the Organization, or maybe he even owns the Organization.

Phoenix Man will return, and will revert back to his resurrected form

After being reduced to Monster Chick Mode by Child Emperor, Phoenix Man will find a way to regain his more powerful, humanoid frame later on. A likely method is that he'll get killed and will resurrect in a stronger form, as he did before. He could even transform into the scrapped Phoenix Brilliant Eagle Mode again!

Mumen Rider is Saitama's equal opposite
Mumen Rider obtained the same power as Saitama, but because his desire was to save people rather then fight monsters for fun they manifested more defensively, he lacks Saitama's super strength, speed, and durability, but he has unlimited endurance, both physically and mentally. Saitama can put anyone down in one hit, Mumen Rider can never be put down no matter how many times you hit him, he always gets back up.

"God" is inside the moon.

This theory has become very popular because of the Psykorochi fight. During the Monster Association arc, the moon has been in many different panels - when the monsters are talking about the cadres, when Genos catches Sekingar's intel, and pretty much during the entire Psykorochi battle. Noticeably, its cracks from when Saitama jumped off of it are still there, and they might even be growing. Additionally, when Psykorochi was talking about seeing "God" in a vision, it appeared as a giant Eldritch sphere. All this seems to be culminating towards some sort of reveal that "God" is inside the moon itself, and that it may break free at some point.

Swim will get a pet hippocampus

Given the C-Class hero Swim has an underwater theme for her hero identity, it would be fitting for her to get a mythological creature connected to Poseidon. Perhaps the hippocampus is a legitimate animal in the OPM universe, or was a runaway experiment of the House of Evolution.

  • Do you mean hippopotamus...?
    • No a hippocampus is like a mythical ocean horse.

Manako is Boros

Think about it - both have one eye, and both have tanked hits from Saitama (although Manako's was slapstick, not an actual punch).

Boros could have survived his fight with Saitama after all. Maybe weaker, but alive. Then Orochi and Psykos found him, gave him a monster cell, and he transformed into a much weaker monster a la Phoenix Man or Black Sperm with no memories.

the rampaging cyborg that destroyed Genos village was neither rampaging nor a cyborg
it was a drone or minimech, controlled by Dr Kuseno, Kuseno has stated that in his youth he had a mad drive for justice which made him wreckless, what if he fought as a hero and his wrecklessness lead him to persue a monster while not thinking abuot the the collateral damage caused by his battle as long as he stopped the bad guy, and it was not until the fight was over and he looked around to see there was only one survivor did he realise he was more dangerous then the monster, which is why hes so intent on making sure genos does not repeat his mistakes, it also makes him a mirror to metal knight, Metal Knight believes that powerful weapons will bring peace, but Kuseno knows just persueing bigger and bigger weapons, even in the name of justice, will only bring more tragedy, which is why genos weaponss whille powerful tend to be very precise to make sure nothing but what genos was aiming at is destroyed, and while he does have some AOE abilities, we see in Genos introduction that Kusano drilled it into him that he must apsolutely make sure everyone is clear of the blast radius before he uses them

The traitor to the Hero Association is:
  • Dr. Bofoi/Metal Knight. There's a lot of evidence for this one. First, the Dr. has more than enough skill to make a cyborg. While he is know to make robots, not cyborgs, we know he experiments on living creatures. Metal Knight also only cares about his weapons development and actively trusts no one, not even his former assistant Child Emperor. He hides his real body and position even from his closest allies and doesn't especially seem to care about heroics. He has ultimate power in the association and collects monsters. The Neo Heroes seem to upgrade and remotely control monsters to engineer disasters and raise their popularity by stopping them. Bofoi is definitely technologically capable of doing this. Furthermore, Drive Knight constantly hints that Bofoi is the traitor and points out how much power he has in the Hero Association and that he could wipe it out in the right circumstances. Even his own student, Child Emperor, suspects him. Drive Knight points out that all his robots are connected and that his Metal Knight was captured easily by the Monster Association. He suggests that Bofoi did this intentionally to allow the codes to all missile bays to fall into enemy hands so he can appear innocent if the missiles are turned against the Hero Associateion.
  • Drive Knight/Zero. An equal amount of evidence points to Drive Knight as being the traitor. Drive Knight is equally as pragmatic and heartless as Bofoi. He constantly points out Metal Knight as the traitor with only his word as evidence. During the Monster Association Arc, he disappears for 2 days without a trace. He claims that he was spying on the Monster Association and he was afraid to share his data with the strike team because he was worried the traitor would use it against them. Yet the Metal Knight body was taken apart in the Monster Association base. While the Organization and G5 are good suspects, it seems odd that if Bofoi was part of the organization that he would use one of his robots to disassemble another one. Drive Knight had the perfect opportunity to disassemble Metal Knight while G5 could get the battle data that he claimed he got during the two days. He also let the surface team be beaten and claims he needed to watch Nyan fight to get a good strategy to fight him. He then gets as much information out of Sekingar about the non-Bofoi related defenses of the Hero Association as he can when G5 shows up and attacks Sekingar and only Sekingar. He seems to glare at Genos when he pops in to save Sekingar. Later on, Drive Knight fights alongside Genos to stop a local threat at the zoo. He continues to claim that Bofoi the threat, that Bofoi made the Mad Cyborg, and that the Mad Cyborg wiped out his village just like Genos. When Genos aims he will talk to Saitama and Dr. Kuseno about the issue before moving on Bofoi, Dr. Kuseno is convenientoy murdered by robots that encourage Genos to attack Bofoi immediately. The fact that we don't know who gave Drive Knight his cybernetics is also a huge missing piece of the puzzle. His name is also "Zero" which could potentially mean he is G0, as in the first working prototype of the G series.
  • Dr. Kuseno. The good doctor is a good candidate for the mastermind of the Organization. For one, he is a master in cybernetics. He could have easily have made the Mad Cyborg. He also followed the Cyborg around and turned one of its victims, Genos, in a cyborg that he could potentially use against the Hero Association. Genos is effectively a child soldier. He is a third party not directly involved with the Hero Association, unlike Metal Knight and Drive Knight, and may see the Hero Association as rivals. The problem starts at him being murdered by Organization robots. While it is possible he could fact his death with a fake body, he isn't really known for making fully organic copies of people's bodies.
  • There isn't a traitor, at least not among the heroes. The Organization is pitting the Hero Association against each other. While Drive Knight suspects Dr. Bofoi, Bofoi doesn't suspect Drive Knight in return despite him being the obvious option. It could be that Bofoi somehow knows that Drive Knight is loyal and Drive Knight is just being manipulated or being too paranoid. The Organization could be getting their information from one of the many corrupt Hero Association executives and have a backdoor in Dr. Bofoi's systems. Since Bofoi supposedly controls those systems, Drive Knight has plenty of reason to suspect Bofoi, assuming he's too smart to not realize he's been hacked. Given that Drive Knight and Bofoi seem equally determined to protect the Hero Association, all the distrust could just stem from a lack of communication and paranoia.
  • All fo them are traitors, It's technically possible for all of them to be in on it. Kuseno could have faked his death by being a cyborg and intentionally leaking fluids and shutting off his vitals. Then Drive Knight can trick Genos into attacking Metal Knight. Metal Knight can then use Genos's "bretayal" as an excuse to take over the Hero Association. Assuming the Organization has control of the Neo Heroes, this would give the 3 of them a monopoly on superheroes and world control. On the other hand, they could all be in it for themselves and Kuseno was the first one to lose in the Gambit Pileup. Given Kuseno has had nothing but kind appearances and even his thoughts lack double meaning statements that could indicate he is a villain, this is less likely.
  • Two of them are traitors. For this one, Drive Knight working with Metal Knight makes the most sense as a trap set up by Metal Knight with Drive Knight convincing Genos to fall into it is the most likely. Drive Knight and Kuseno is a possibility if Drive Knight is the mad cyborg and was created by Kuseno with Metal Knight being the rival they are targeting for elimination. Kuseno and Metal Knight is the least likely as why would Kuseno have his own lab destroyed and then risk Metal Knight's lab as well given that Saitama's capabilities are completely unknown? If the two traitors aren't working together, then the previous motivations in some sort of Gambit Pileup is still possible.
  • Jet Nice Guy is the traitor. Twice Jet Nice Guy was defeated in battle, once for rashness and the other for not paying attention. He lost to both Seaking and Nyan, putting his allies at risk. Since we don't know who made him a cyborg or if he's human at all (with the possibility that he's just two robots made to look like the same person), he could be an Organization goon pretending to be weak to get Metal Knight and Drive Knight to ignore him as the possible traitor.

Bang's Possible Newest Disciples
In Bang's long quest to find new disciples to teach his techniques to.
  • Swim, the bottom ranked C-class hero. With her determination to become part of the Blizzard Group, she could try improving by learning unarmed martial arts skills. Also, she probably would find Bang's Fist of Flowing Water, Crushed Rock technique awesome and fitting with her water themed hero suit.
  • Amai Mask, after being forced on the run. The monster would stay at Bang's dojo due to its isolated location and the need control his emotions.

Tatsumaki suffers from hormonal disfunction due the experiments done on her
To improve her psychic powers and try to identify the source, the scientists have intervened on her biochemistry and hormonal production, and as a side effect her body never really developed, resulting in her partially child-like appearance and mercurial temper - the latter actually being her keeping it in check as much as she can, as she knows of her hormonal disfunction. And to add insult to injury, the experiments yielded no result and were interrupted shortly before Blast freed her.

    Crossover Theories 

List of people from other series who could possibly give Saitama a legitimate fight


One-Punch Man takes place in the future of Mob Psycho 100

Mob Psycho despite officially being part of the same world, lacks all the mysterious beings and there are no heroes, and psychics and ghosts are only slowly becoming a thing (also a young Tatsumaki and Fubuki are shown at one point). Most likely something happened between Mob Psycho and One-Punch Man that led to a mass empowering, allowing people to push the limits of humanity or go over the edge and become monsters. Mob Psycho likely takes place around 8-10 years before One Punch Man, and BLAST is widely believed to be a grown up Mob (who would be around the same age as Tatsumaki, + or - a couple years).

  • Alternatively, BLAST is Ritsu, Mob's brother who was always more outgoing than Mob and seems more likely to have gone "hero" than the Mob whose main desire is to be normal and pretend he has no powers.
    • THAT COULD WORK OUT A LOT. Mob could've been the source of the Mysterious Beings as well and Ritsu became a hero to help deal with the aftermath, feeling partially responsible as his brother. If ???% somehow takes over Mob, his powers could go all wonky and cause these supernatural beings and powers to emerge. Or it could have been the after effects of the divine tree/broccoli. Still, Mob could easily be Blast, though. After the manga, he helps others just like Reigen does (sort of) by using his powers regularly now. If so, Blast's speech to Tatsumaki and his lack of publicity makes sense since the manga is pretty much Mob's growth as a person and his want to be just "Mob", despite his powers.
      • The silhouette that's all we've seen of Blast is a muscular dark-haired man. Perhaps by the time he's an adult, the Body Improvement Club has worked wonders for Mob's physique.
    • Maybe the organization that held Tatsumaki prisoner as a child was Claw. Makes sense, especially considering the psychic part.

One-Punch Man and My Hero Academia are set in the same universe, just at different points in time—and Saitama is a holder of One For All

  • Think about it: Very little explanation is given as to why some people have certain powers and why others don't in the One-Punch Man universe, but they all seem suspiciously consistent with MHA's explanation of their power (one of the Hero Association's heroes can bend metal at will, and sister heroes both have telekinetic abilities); sounds an awful lot like the "quirks" of MHA to me. It should be noted that MHA tells us when the first quirk was recorded as BEING a quirk and the acknowledgement that such things officially existed, but how long they existed before that is never explained. Saitama and All-Might have notably similar powers (and similar lack of powers) and demonstrated power levels on par with one-another. Their punches can cause extreme weather distortions, neither can fly, but they can jump exceptionally well, and are both virtually indestructible (except supposedly against blades, which we haven't seen how Saitama reacts to being hit with a blade). Also quite similar are the criteria for being able to inherit One For All: a body in extroardinarily good shape. Saitama credits his sudden power gain to three solid years of strength training (100 push-ups, sit-ups, squats, and 10km runs every day), whereas Izuku Midoriya (the protagonist of My Hero Academia) conditioned himself by cleaning a beach filled with all manner of heavy items and things in addition to jogging, weightlifting, and swimming over the course of 10 months. Izuku has trouble controlling One For All at first because he "was a vessel made in a hurry", whereas the less intense workout over a longer period of time by Saitama allowed him far better control. One final note: in the One-Punch Man canon, the Hero Association has only existed for about 3 years and its competance is questionable at best, whereas the Hero Offices of MHA are generations old and have heroics almost down to a science. Is it possible that the Hero Association eventually matured into Hero Offices?
    • Impossible. One-Punch Man has been confirmed to take place in a world with only one continent, separated into 26 districts. My Hero Academia takes place in a world with geography similar to that of the real world.

One-Punch Man is set in the same universe as Empowered

Many, many superheroes? Check. Many heroes being jerks? Check. A form of organization for the heroes? Check. It's the same setting, with One-Punch Man being in Japan and Empowered in the US.

Saitama is the reincarnation of Goku or Gohan.

He does similar training, and receives a similar power up. This is Saitama awakening the power he had from his past life.

Saitama is a Kryptonian.

He was always abnormally strong, as seen when he dealt with the crab monster, Crablante. However he was constantly wearing a long-sleeved shirt and pants, so most of the sunlight was wasted on his clothes. Therefore he only had low-grade kryptonian abilities. Once he went bald, his head absorbed a large amount of sunlight, which was previously stopped by his thick hair. From that point on he started developing kryptonian super strength, speed, durability and super senses (as seen in the webcomic). He can also use other kryptonian abilities such as flight subconsciously, as seen when he kicked back a huge several tons shell back at boros's ship while being airborne, or when he jumped back from the moon to the earth and landed directly on the ship. However he is absolutely sure he is human and as "Humans cant fly" he never actualy tried flying. Same goes for heat vision and ice breath, he simply never tried them, as he is convinced he is human.

  • Specifically, after the conclusion of his fight with Garou in the manga, it seems he's a Silver Age Kryptonian. Sneezing away celestial bodies, physically grabbing wormholes/space portals, and traveling through time under his own power are all things that Silver Age Superman was known for. Propelling himself through space with a fart is probably the only thing in that chapter that Silver Age Superman never did, although if he wanted to he certainly could have.

Multiverses exist and the real source of Saitama's strength is similar to The One

The risks that Saitama took (fighting more powerful monsters, training from hell, poor diet, etc.) in his time as a hero killed all/most of his multiverse selves, leaving his remaining selves/self all-mighty. This is why he has become super-powered while doing mundane training. Alternatively, all of the other Saitamas have died while training or fighting monsters and the one we see is the lucky one who has been absorbing the power of the others without even knowing it.

Saitama is so strong because he accidentally summoned the spirit of Bud Spencer

Specifically, he summoned all of his characters. And considering what just one can do...

This world is the future (or past) of Soul Eater

Just like the Kishin, madness and obsession can gift people with Lovecraftian superpowers. The only difference is that heroes have relatively benign obsessions while Mysterious Beings succumb to the madness inherent in theirs. In the more powerful heroes like Tatsumaki, Metal Knight and Fubuki we start seeing the genesis of Witches. Saitama might be a precursor to (or actually IS) Shinigami, someone who has effectively become a Humanoid Abomination en route to ascending to an Anthropomorphic Personification of Death.

One-Punch Man takes place in the same universe as Heroic Age and Saitama is either the reincarnation or the direct descendant of Age and Dhianeila.

Saitama and Bellcross are almost similar since they're pretty much an unstoppable being that could survive anything that is thrown at them and ends almost any of their fights by just one punch. Saitama's source of power is probably comes from the Nodos of existence itself and he is unaware that he is actually bend the reality just like Bellcross

Saitama’s power comes from the Getter Rays.

During his three years of training, his Hot-Blooded desire to become the strongest hero caused the Getter Rays to become attracted to him endowing him with their infinite power and causing him to hyper evolve to a state where humans would be universally bald. The reason that when he punches with the intent to kill the victim sometimes explodes into Ludicrous Gibs is because in addition to augmenting his physical strength, the Getter Rays are occasionally released into his opponents body, triggering mutations in several cells, causing them to become cancerous and causing the enemy to explode. Carnage Kabuto became terrified of Saitama as soon as he sensed something off about him, much like the villains in Getter Robo have an innate fear of the Getter Rays. Not to mention during the theme song the lyrics are “Power! Getter power!”

The grandfather of the butt-chinned kid is a lovechild of the Ballchinian.

There will someday be a character who is inspired by and is a Expy on Chirin.
Why? Since Saitama was inspired by Anpanman, this character will be on Chirin who has a similar personality (somewhat) and power to Saitama, but is a antagonist and villain who's only being a villain for fun and as a hobby. It be only natural since they are both based on the characters that are created by the same person, Takashi Yanase.

Saitama is Touma Kamijou's son in the future. Touma did not enroll Saitama to Academy City for Saitama's well being.
People say that apples do not fall far from the tree. The similarities between Saitama and Touma are too astonishing for them to not be related. Saitama's old spiky hair style resembles Touma's, they use their fists in battles, and flashback chapters revealed that Saitama experienced many misfortunes in his high school life, just like Touma. Touma did not enroll Saitama to Academy City because he was sure Saitama would be registered as Level 0 and got unfair treatment since Saitama did not have any special power (he got his butt kicked a lot by school bullies despite attempting to stand up for himself) before he completed his absurd training regime and went bald.