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WMG / One-Punch Man

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 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.

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.

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).

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 too great 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.

By the time Genos finds the 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 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.

Related to the above theory: Drive Knight is the cyborg that Genos is looking for
Drive Knight is Dangerously Genre Savvy and 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.

The series will end with Saitama fighting God
I see it playing out similar Asura's Wrath: God reveals that he's responasible for much of the Earth's suffering (or maybe is just too lazy to do anything about it), Saitama gets pissed, they fight (with Saitama finnally fighting at 100%) and Saitama either A) killing God, B) dying in the attempt, or C) both.

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

Related to the above theory: The Hero Association is going to 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. All that tells me that something fishy is going on.

King actually does have a superpower: His 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.

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.

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.
  • ... 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.
  • ... 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.
  • ... 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".
    • 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.
    • This WMG may be close to being true, considering Blast's appearance in Tatsumaki's flashback, which looks like Saitama with still a decent head of hair.
  • ... Bang and Bomb's third brother, following the same naming conventions.
  • ... a cyborg.
    • The cyborg who destroyed Genos' hometown and killed his family.
  • ... Metal Bat's younger sister, Zenko.
  • ... someone Saitama might never be able to defeat should he appear one day.
  • ... never around because his training made him bald and he's too ashamed to be seen anymore.
  • Saitama's father. The reason he's never seen is because when Saitama's gained his powers, Blast lost his.
  • This guy. He does bear some resemblance to Saitama before he became bald.

Whatever power Saitama have, 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 got to live an ordinary life)

(Again, that's assuming what i said is true, and it's half the energy used to create his universe (if it's bigger than our))
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.

The grandfather of the kid from the 2nd chapter
Is a lovechild of the Ballchinian.

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.

The story will end
With Saitama either lose his power (and regrow his hair) or his death.

Genos is the android who destroyed his village.
Or, 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.

I imagine that 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.

Sweet Mask is going to kill a main character at some point.
Let's be honest, 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.

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.

Genos was never human
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's power is unconscious gravity/mass manipulation
Lots of little things lead 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

Boros's prophesied opponent wasn't Saitama.
Boros was 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.

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 Garou would be one hell of a battle.

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 approved it since Saitama's strong enough. Hilarity Ensues.

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.

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.

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.

Saitama is a Kryptonian.
He was always abnormally strong, as seen when he dealt with the crab monster, Crablante. However he was constantly wearing 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.

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.

Saitama will die after using his full strength.

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.

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.

The God who gave Homeless Emperor his powers is 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.

Blast and Saitama are related
Given how Tatsumaki's flashback showed that Blast has a lot of Saitama's traits, mannerisms and even shares a resemblance in appearance it's entirely possible Blast is either Saitama's father, an uncle, or older brother. If not any of those they have to be related some way.

License-less 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.
http://tvtropes.org/pmwiki/pmwiki.php/WMG/OnepunchMan