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Nightmare Fuel / One-Punch Man

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    In General 
  • Just the entire setting in general is Nightmare Fuel, especially for normal people and even lower-tier heroes. Horrific monsters capable of anything from killing dozens of people to annihilating entire cities are practically common occurrences. Anyone can become a monster, even that one guy who just ate way too much crab one day and anything can set them off. Think the heroes will protect you? With the exception of those in S-Class (of which, there are only 17) and a scant handful of those in A and B Class, most of them seem to be just normal people in costumes. So the odds of them being strong enough to beat the monster of the week/day/hour is close to nil.
    • Anything from eating too much crab to having a reptile obsession can turn you into a monster in this universe. Talk about Paranoia Fuel...
    • One of the bonus chapters lessens this somewhat, as it shows that even the average C-class hero is far more physically capable than a normal person (not to mention the B- and A-Class heroes, who are typically many times stronger), which just makes it even more horrifying in hindsight because they're still pretty much useless.
  • The manga and anime have a plentiful Gorn when it comes to monsters. A good example is Crablante who, by pulling on his eye socket, pre-hero Saitama managed to completely pull out all his innards with massive amounts of Alien Blood raining down. This comes especially surprising to international viewers since the series is not labeled as a Seinen as it is in Japan.

    Heroes 
In some ways, the heroes are just as creepy as the monsters and villains they fight against and these in particular stand out.
  • The sheer amount of power Saitama has. You'd think obliterating his opponents with a single punch would be enough (and many of those were pretty gruesome), but just the air blasts generated by his punches can carve holes through mountain ranges. He's also strong enough that black hole levels of gravity don't even impress him, fast enough to cast afterimages, and once got launched to the moon and then jumped his way back. He landed barely a few meters away from his starting position. Finally, to end his fight with Boros, he used a punch from his "serious series." The force of this punch not only split Boros' planet-destroying beam in half, but it also split the atmosphere for thousands of miles across the world. That's when it became clear that Saitama had been holding back his full power the entire time. All those one hit kills? He was barely even trying with those. Everyone should be thankful that not only is he too lazy to really go all out, but that he's also a hero, even if it's just for fun.
    • During the Garo arc, Tank Top Master goes into detail about how dangerous Garo is, using counter-attacks and striking at vital spots and joints. "He possesses special techniques for breaking people." Saitama smiles at this statement.
  • Watchdog Man is an apathetic guy who wears a white dog costume. One of the first images of him as him Atop a Mountain of Monster Corpses. Have fun.
    • In the manga, Garou targets him during his "Hero Hunt"... And, before actually challenging him, Garou recalls the brutal beatdown Watchdog Man just gave 30 monsters without changing expression one bit, and admits he couldn't even tell who was the real monster there. He then attacks... And Garou, the one who was hunting the S-Class Heroes, is lucky to escape with his life. And Watchdog Man didn't lose his blank look even against him.
  • For someone with such a good public image, Handsome Kamen Amai Mask can get pretty creepy. The way his veins bulge when he uses his power hinges on Body Horror and his lack of mercy towards mysterious beings is played rather seriously yet goes unnoticed by the general populace.
    • While it is awesome in its own way, Sweet Mask putting back his own arm that was just cut just like it was nothing add to the impression that something is wrong with him.

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Introduction Saga

    House of Evolution Arc 
  • The Mosquito swarm, which can drain a human dry in the span of seconds, leaving them to crumble to dust.
  • Found you...
  • The House of Evolution conducts hundreds of dangerous experiments in order to create what its leader, Doctor Genus, thinks are perfect beings, starting from animals then moving to humans. Judging by his creations, he would have nearly succeeded if it wasn't for Saitama. Zombieman was revealed to be one of Genus' experiments.
  • Carnage Kabuto is an exceptionally terrifying monster. From the fact that he's considered too destructive and violent even by the standards of the House of Evolution, which had no problems with Beast King, to the way he punched a clone so hard that his torso turns inside out, to his Berserker Mode that sends him into an Unstoppable Rage for an entire week, to some very disturbing facial expressions.

    Paradise Group Arc 

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Hero Association Saga

    Sea Monster Arc 
  • Sea King's rampage. Despite their best efforts, no hero present could stop him. He enjoyed every bit of terror and suffering he caused to both heroes and civilians, and had intended to kill and eat all of them. When Genos tells a little girl who was with her father to run, he spits acid at them, which Genos blocks but it dissolves much of his body, leaving him helpless. The acid's effects on Genos and the little girl's reaction to it were hard to watch.
    • The part where Sea King just appears right behind Lighting Max. One moment, he was maybe miles away, and the next, he was right behind him. It took him literally moments to get from one spot to another.
    • The Deep Sea King's appearance and design don't help either, specifically some of the faces he pulls (such as this one), his pale flesh giving his humanoid "dehydrated" appearance an Uncanny Valley look to it. His hydrated state is even worse, his face taking on a more shark-like look that seems to peel back his lips to reveal More Teeth than the Osmond Family, and the faces he makes then are outright horrific.
    • The acid attack itself was actually Fridge Horror: basically, Genos' body was destroyed and he was rendered helpless while people he couldn't protect were about to be killed by an insane monster. Where have we seen that before? Oh, that's right: when Genos' hometown was destroyed. You can watch Genos struggling to get up, despite being a head and a torso, and you remember that he's been here before: this is probably bringing back literal nightmares for him.
  • Being a criminal in the prison of PriPri's territory.

    Alien Conquerors Arc 
  • The seer Shibabawa which predicted with a 100% accuracy many great disasters had a vision that unlike the others she had before freaked her out. Unfortunately no one know what she saw, only that "The Earth is in trouble!!!" and that whatever she saw will happen somewhere in the next 6 months. And while we don't know what is going to happen, there's in the background the feeling that things are getting worse as monsters attacks keep intensifying.
  • Melzagald, the alien fought by Iaian and later the S-class heroes, who spends pretty much all his screentime doing creepy distorted faces and seems to have several personalities conversing with each other from each face. He can regenerate himself, too.
    • Fun Fact: His VA, Kōki Uchiyama, was the one who voiced the Chimera Ant King.
    • Another Fun Fact: In the English dub, he's voiced by Vic Mignogna, aka the guy who did BROLY.
    • Not to mention the most creepy distorted music in the show. Whenever he's onscreen, he plays this music...
  • While this counts as fridge more than nightmare fuel, when Boros kicked Saitama into space, Saitama hit the moon. Keep in mind that Boros was not aiming for the moon. The odds of hitting the moon with a projectile (Saitama in this case) without aiming for it are astronomically low. If Saitama hadn't hit the moon, he would have just kept sailing away from Earth forever since he can't fly.
    • Saitama could have still escaped if he missed the moon by taking nearly any article of his clothing (a button, the head of his zipper) and simply flinging it in the opposite direction. Given his immense strength even a small amount of matter being propelled into space would have reversed his course and sent him back to earth. It's far fetched, but considering how absurdly powerful he is...

Human Monster Saga

    Monster Raid Arc 
  • Disaster Level: Demon monster named Face-Ripper whose entire body is covered in torn off faces, sewn together Frankenstein's Monster style.
  • The introduction of Monster King Orochi, the leader of the Monster Association.
  • We learn how the monsters are made — the potential is inside every human, and all the monster transformations merely overcome the various natural limiters of mind and body. The most effective way of producing a powerful monster? Find a human with lots of potential, and put him in Die or Fly situations repeatedly, until his survival instinct overcomes his humanity.

    Monster Association Arc 
  • We finally get to see King Orochi in action. Until now, he was a colossal Horned Humanoid, but didn't amount to much, mostly standing like a statue while other monsters did his work. When he finally moves, it is with speed an order of magnitude too great for something of that size, the Shapeshifter Weapon body unwinding into a mass of claws, fangs, and fire-breathing throats that don't discriminate between enemies, and monsters too slow to get out of the way. Worse, despite of how far he has moved from his humanity, he's still smart enough to learn, instantly, any combat moves he sees from his enemies. The manga art makes great work of showing off just what kind of terror he is to anyone who isn't Saitama.
  • Zombieman's fight against Pureblood amounts to a gorefest of How Much More Can He Take?. At one point, one of Pureblood's bats gets stuck inside Zombieman as the hero regenerates around it.
  • People had doubts about Nyan being a legitimate dragon level threat due to him not doing much so far and even running away from Puri Puri Prisonner, one of the weakest S rank hero. Nyan coming out to the surface massacring the reserve heroes and trying to kill the hostage in front of them for its own amusement while throwing in a few Nightmare Face for good measure corrected that.
  • Orochi's form post-splat, thanks to Saitama. Orochi's consciousness survives the impact, and the bits of his body that were spread all over the base begin moving back together. To make matters worse, the gores stick to and absorb any monsters in its path to get energy back. It then coalesces into a big blob of bloody guts and attacks Tatsumaki, yelling "GIVE ME YOUR BLOOD!"
    • Isn't made much better when Orochi absorbs Psykos, who slowly realizes she cannot control the Monster King anymore and is pulled into his mass of flesh. The two fuse, and end up as a massive moth-like creature with Psykos' upper half sticking out of the top. They seem to have a shared consciousness, and quickly overpower Tatsumaki, one of the Hero Association's most powerful assets.
  • Psykos's vision. She tried to look into the future and as a result saw something extremely bad. What exactly? No one know yet but it was apparently so bad she lost faith in humanity and decided that ruling over it wasn't worth it and that the only option left was to Kill Them All. When Fubuki ask her about it, she say she doesn't remember but the way she tremble with fear while she answer might be telling otherwise. On top of that, there is the possibility that what she saw was actually Shibabawa's vision.
    • The implications of this are terrifying if we apply Fridge Horror. The Earth might be in trouble from humanity itself, or perhaps, one single member of mankind.
  • Garou with his "hero hunt". He is so strong that nearly all the S-Class heroes and others are unable to stop him. Especially in the end where he transformed into a monster and curb stomps even Tatsumaki. Fortunately he was given a lecture by Saitama.
  • The one who gave Homeless Emperor his power.
    • Speaking of which, the circumstance of Homeless Emperor's death. As he was about to give info about said character to Zombieman, said character took back Homeless Emperor's powers and life before he talked anymore, the implication being that he was perhaps silenced before giving away said info which also implies Homeless Emperor was being watched.
  • The fused Psykos and Orochi telekinetically lift a chunk of the Earth so massive that it's visible from space, including lifting a large chunk of the ocean.
  • It seems Saitama or Boros are related to "God" and is manipulating things behind the scenes. After Boros punched Saitama into the moon, giant concentric circles were formed by the crater impact. At one point as Tatsumaki fought Psykos, a vision of the moon as a giant eye glared down on her and caused her to spew blood from the mouth and eyes, breaking her concentration. Whatever "God" is, it is extraordinarily powerful, it can give people great power for a simple wish, it can see everything through the moon (perhaps even being the moon), and it can drain and heavily damage the top level psychic known to humanity with just a "glance". Worse, it tried to give Flashy Flash, Saitama, and the monster they were with a proportion of its power through a extremely dense metal cube it controls. Blast then shows up and disposes of the cube before anyone can process what the cube is offering. We see Blast with another such cube almost 2 decades in the past in the facility Tatsumaki was kept in. This implies that the reason the top level hero of Earth is always absent from fighting normal monsters is because he's been undermining a god level threat for at least 2 decades. Despite that, the monster problem has only gotten worse meaning Blast seems to losing this fight.
  • After being eaten by Gums, Fuhrer ugly rips his way out, only now his body is partially melted and covered in stomach acid. As "Barf Fuhrer Ugly", he melts Superalloy Blackluster's fists to the bone with a touch and kills the entirety of the Swordsman Council (minus Atomic Samurai). Two don't even get a chance to react and are melted instantly.

Neo Heroes Saga

    Ninjas Arc 
  • At the beginning of the arc, King decides to get stronger by learning martial arts. He travels to various dojos but they all turn him down. Bang thinks his defensive style won't fit King's strength, Bomb thinks King is so strong that his alpha strike moves won't improve anything, the quipong instructor thinks he can't help King develop a new move, the savages are laying low, Sourface thinks his dojo is being hunted so they give King their sign, another thinks this is a power play from the Hero Association to get them on their side, etc. It's all culminates into being sent to the last dojo where one must mediate on their past and future. In this case, death. The final sensei is a buddha who came there to die and subsequently mummified to show all warriors who come to this final place that no matter how strong you are, you will eventually die. King rightly freaks out, not ready for this kind of training and runs to the nearby waterfall to get water and founds Garou undergoing the training. This breaks King and he almost decides that he should just throw himself onto the next monster he meets and be killed until Saitama suggests that he just do basic strength training.
  • The mysterious Ninja Village Leader. He has been alive for over three hundred years, since he keeps replacing parts of his body with the parts from those he assassinates. This results in him having a patched-together look, along with piercing cat-like eyes and a jagged smile. He is also the one who once ran the Ninja Village, which put its students through brutal training, more like torture, really. Luckily, he is quickly defeated by Saitama.

    Supreme Hero Arc 
  • Despite claiming to have more morals than the corrupt Hero Association. Some of Neo Heroes' Neo Leaders are criminals who supposedly reformed by joining them, but it is clearly rather doubtful:
    • A is a hitman with an A-Class bounty who joined Neo Heroes in exchange for their protection. It is also clear that he is only working for the protection and warns pro heroes about unfortunate "accidents" happening.
    • Ryumon and his gang are now allowed to carry weapons with Ryumon in particular being happy to carry a gun which is especially worrying considering they number at 400 and the fact they say that they will improve society with violence.
  • According to Koko's Stat-O-Vision Destro and Erimin have modified over 90 percent of their bodies which is not helped by their similarities to the Organization members.
  • The implication that Neo Heroes are just Unwitting Pawns of Metal Knight or possibly the Organization is truly worrying due to nearly all of their members wearing suits that make them as strong as A-Class heroes.
  • To remind the audience that Demon-Level and higher monsters are truly a dangerous threat, Zaedats' and his battle suit get crushed and Infelsinave has a hole in his torso after fighting against such monsters. Not to mention the several other Neo Heroes who are also at death's door once they faced a monster their battle suits could not penetrate and which could break through their defense.
  • Whenever a Neo Hero gets severely injured, they are sent to the recovery room where they are "healed" by turning them into cyborgs at the cost of their free will.
  • In spite of the destruction of the Monster Association, the appearances of monsters not only continue, but are also increasing. Not helping the matter is the fact that not only did the increase happen during Neo Heroes' debut, but Child Emperor's research shows that the monsters the new organization fought against were enhanced to make them stronger and were controlled with chips in their brain.

OVA

  • "The Ninja Who Is Too Complicated" suddenly turns into The Revenant near the end, though Saitama shows up before things get too brutal.

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