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  • Accidental Innuendo: Chapter 57 of the webcomic:
    Genos: What do you want with Sensei's meat?
    Fubuki: Demon Cyborg, Genos... are you truly satisfied under that man?
  • Adaptation Displacement: Most people would be more familiar with the anime than the manga, and there are certainly fewer people familiar with the webcomic than the former. It doesn't help that the visuals from the webcomic is crudely drawn, turning off people from reading the original one.
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  • Alternative Character Interpretation: Is Saitama's "being a hero is just my hobby" thing him playing off a genuine desire to help as I Was Just Passing Through, or does he genuinely not care about the big picture as long as he gets the immediate gratification of fighting a monster and saving the day? He's clearly a decent person in many respects, but it's possible to read the setting as a Crapsack World and Saitama as someone who genuinely doesn't really think or care about the horrific damage wrecked by the constant monster attacks he faces as long as he gets good fights out of it.
  • Angst? What Angst?: Saitama is pretty unfazed by the unwarranted hate mail he gets.
  • Applicability: Bill Burr mentioned in one of his podcasts that One-Punch Man could be read as a commentary on modern Japan, with Saitama being the everyman who beats up villains that symbolize what's wrong with society.
  • Arc Fatigue:
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    • The martial-arts Tournament Arc that lasted from Chapters 58 to 71 in the manga ended up being quite fatiguing for some readers, particularly with ONE and Murata's long pauses, not to mention the focus was on a massive monster breakout that occurred during the tournament that resulted in many one-off heroes battling the monsters, rather than on Saitama’s arc. As a result, many felt that the arc was detracting from the central plot. It also doesn't help that the arc can be seen as "Filler" note  for being smack dab in the middle of the ongoing "Hero Hunter Garou Arc", which is a sore spot for the fans that wished to finally see the Garou storyline conclude.
    • The attack on the Monster Association's hideout gets this from some readers due to excessive Padding. This mostly stems from the plot falling to a snail's pace because of the number of chapters that Murata spent showing off new, or extended, fights between the heroes and low-tier monsters that weren't there within ONE's original comic. As a result, there isn't much storytelling throughout these chapters other than showing off the powers of the heroes. The extended Child Emperor vs. Phoenix Man fight in particular received the most backlash due to its length.
      • The waiting for this arc to finally finish only gets worse due to Murata going back and making a bunch of revisions to previous chapters while the arc is ongoing. Murata originally had Sweet Mask kill a group of human mercenaries, but he eventually goes back to revise said chapter so that the mercenaries actually live this time around. This would lead to later chapters also getting revisions to include new scenes of the mercenaries since it wouldn't make sense for them to just disappear after the retcon.
  • Awesome Art:
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    • Yusuke Murata's redraw. Just compare ONE's original drawings (which aren't too bad themselves) to Murata's.
    • The first season of the anime was also brilliantly drawn and animated by the staff at Madhouse Inc., setting a new precedent for animation in anime.
  • Awesome Ego: Garou is this way for most of the Human Monster Saga as he continuously beats hero after hero; fans just love his unrepentant evil. Until Saitama brutally humbles him.
    Garou: Stop me if you can! Until then, I'll stay this cocky!
  • Awesome Music: Lots in both Madhouse and J.C. Staff's seasons.
  • Awesomeness Withdrawal: The anime has gained a massive following thanks to affectionate and off-the-wall parodying of shounen tropes, wonderful animation, and crazy cast. This is why the anime's mere 12 episode run has left many starved for more. Then Season 2 was announced to be launched in the later months of 2016, probably around the same months of the first season's release. Now..... Subversion confirmed!
  • Base-Breaking Character:
    • Puri-Puri-Prisoner. Many fans got turned off by him, due to being a hero who cannot help himself from having his way with men. Some think he's still hilarious and an entertaining character but others, especially some of the LGBT fanbase, think he should be cut off from the story due to being a Bara caricature on top of the previous issue's unfortunate and offensive stereotype.
    • Saitama himself. His main gag, the gag that is the manga's title even, is either a side-splittingly hilarious exaggeration of one of Shonen's key tropes or it overstays its welcome (the fact that internet trolls have run it into the ground has not helped at all). The caped baldy's constant "meh" attitude at everything thanks to said main gag is also either very funny or annoying.
    • Phoenix Man. Suddenly, a mid-level Mook is given a power boost that makes him rival the very leaders of the Monster Association themselves? Some fans find him a welcome surprise that spices up the story and gives Child Emperor a real challenge to show off his skills, while others feel he steals the thunder of the soon-to-be-introduced cadres and slows down the story too much. Phoenix Man wasn't like this in the original webcomic either, which of course grinds the gears of all webcomic purists.
  • Broken Base:
    • The fandom is pretty split between preferring ONE's original work and Murata's redrawn version, to say the least.
    • Naturally, the English dub is polarizing to some degree. Some people think Saitama's English voice does his perpetual boredom justice, while others think it's missing a certain charm that the original Japanese voice had. In particular, Genos' dub voice has garnered a lot of split opinions among viewers. Some think it's a perfect match with Kaito Ishikawa and fits his serious militaristic personality while others find that his voice is incredibly forced and doesn't sound natural at all.
    • Whether Tatsumaki wears underwear or not. No, really. Many fans think that she wears very thin thongs, while others, as seen from many scenes which show her buttcheeks and buttcrack, insist that she wears nothing down there.
    • Season 2's production values have sparked similar debates, in particular, whether or not JC Staff's animation is either not as good as Madhouse or just flat out incompetent even for their standards. Likewise, the sound design by Yoshikazu Iwanami — does it capture the feel of the manga enough? Or is it just too much like his work on previous efforts such as Berserk (2016) or Jojos Bizarre Adventure.
    • Sony's announcement of a Live-Action Adaptation has raised many eyebrows. A vocal majority have already declared it a lost cause due to the mediocre track record of Hollywood anime adaptations in the past, while other fans are cautiously optimistic and willing to give it a chance. One thing can be agreed on: everyone is concerned.
    • In large part thanks to the manga, anime, and different guide books all saying different things about Boros and his Collapsing Star Roaring Cannon, there have been endless debates over how strong Boros truly is and whether he's a planet-buster, star-buster, continent-buster, or just simply a planetary surface wiper. The fact that we never see the full extent of what his Collapsing Star Roaring Cannon can do before it gets pulverized by Saitama only adds more fuel to the flames.
  • Cliché Storm: Well, it was created as a parody of shounen and superhero tropes in general. It is part of the charm.
  • Common Knowledge:
    • Madhouse is exclusively given credit and praise for animating Season 1, particularly after JC Staff was announced to be animating Season 2, and only intensified when the latter season aired to poor reception. While Madhouse was officially the studio that animated Season 1, much of the animation wasn't actually done in-house. Many of the best-animated scenes in Season 1 were done by animators from Studio Bones, who worked under aliases (most notably, Yutaka Nakamura, who went uncredited outright). The fight between Saitama and Genos, which is often used to show the first season's animation quality? Mostly done by an animator (Arifumi Imai) associated with Wit Studio, not Madhouse. While many other notable scenes (such as Crablante's death by Taiki Imamura, or Deep Sea King's punch on Saitama as animated by Bahi JD) were done by freelance animators as a favor to director Shingo Natsume. Madhouse only produced the series and provided the studios used to do in-betweens and paint the scenes. Possibly, even Madhouse itself wouldn't have been able to match Season 1's quality if they'd done Season 2 since many of the animators from Season 1 are currently at different studios.
    • People often draw parallels between the Hero Hunter Garou and the Hero Killer Stain (from My Hero Academia). On the surface, they are quite similar, but there's a tendency to assign Stain's goals — to purge the streets of unjust heroes — to Garou, which is inaccurate. While Stain is concerned with good vs. evil, Garou rejects the notion of justice and concerns himself with popular vs. unpopular. He wants to get back at those who are in power. He believes it's unfair how society assigns "heroes" and gives them the ability to do whatever they want, while others are assigned as "villains" or "monsters" and are subjected to the heroes' punishments. In order to make the popular people of the world feel what it's like to be the unpopular guys for a change, he wants to become the ultimate, unfair monster and turn the tables. Only it's not actually that, but Garou wants to become the ultimate monster so that it would unite humanity and give birth to the greatest hero.
  • Crack Ship:
    • Tatsumaki and Genos have exploded in popularity after the two of them teamed up to bring down Psykorochi, with Tatsumaki genuinely complimenting Genos for fighting off Psykorochi in a Beam-O-War using his ten-second Super Mode. She also protects him from falling after he runs out of power and he returns the favor while she's losing consciousness, leading to many seeing this as a fast-developing Vitriolic Best Buds relationship at the very least.
    • There's a surprising amount of Garou x Fubuki fanart out there, despite their only interaction being Garou striking fear in her heart when he first appears as Awakened Garou.
  • Crosses the Line Twice: Puri-Puri-Prisoner is intended to be this, what with being a gay Bara caricature who engages in regular Prison Rape and yet is still portrayed as a heroic character. The fandom is divided on whether he crosses the line once, twice, or three times.
  • Draco in Leather Pants: Speed-o'-Sound Sonic certainly counts. Although Sonic is classified as a villain in-series, has made it his life's goal to kill Saitama, and has endangered innocent lives to goad Saitama into a fight, many fans often downplay his villainous actions. Although he does have genuine Pet the Dog moments, they only occurred in an anime-only OVA.
  • Ensemble Dark Horse:
    • Mumen Rider only has a significant role in one of the story's arcs but has gained a lot of fans, particularly after standing up to the Deep Sea King.
    • Fubuki/Blizzard, who only appears for a few seconds in the anime's first season, was second only to Saitama himself by a narrow margin in the 2015 character poll, outranking even Sonic, Mumen Rider, and Genos. Keep in mind, Blizzard was a relatively recent addition to the band at that point, especially in the Murata version where she'd only been around for a handful of chapters. Her sympathetic motives and Action Girl status no doubt helped, as well as being a drop-dead gorgeous but tasteful Ms. Fanservice. As such, she's also had some special chapters centered around her. It's even brought up in the post-poll chapter, the Blizzard Group mentioning how she's had little screen time. She had this to say:
      Blizzard: "But not placing first doesn't feel right after all, which means I have to become the main protagonist."
    • Tatsumaki, for anime-only watchers. While manga readers know that she's a Little Miss Badass, her great design in the anime, and the fact that she's the first female hero introduced on-screen, garnered her an immediate following. For double the irony, unlike her sister Fubuki (who is actually shown to become part of Saitama's circle of acquaintances by regularly visiting his apartment, much like King), Tatsumaki only really gets to interact with Saitama in the webcomic after the Monster Association arc.
    • Mosquito Girl managed to place 9th in the character poll, despite only appearing for two chapters. Much like Blizzard, a lot of popularity is owed to her attractive design (for a woman that's part mosquito) and fanservice factor.
    • Similar to Mosquito Girl above, Zombieman managed to come in at 7th place in the character poll despite his only appearance in the series at the time being little more than a cameo.
    • Captain Mizuki got some attention for being an adorable Amazonian Beauty with an interesting fighting style based on Olympic events. Even before that, her Amazonian Beauty traits gave her many fanarts and Perverse Sexual Lust factors.
    • Boros is quite popular with the fans for the following reasons: He's the first one to somewhat match Saitama in a fight; his Blood Knight and Affably Evil personality is likeable; he accepts his demise peacefully, and is actually quite an attractive villain, despite — or maybe even because of — him having only one eye. He is also one of the few villains that respect Saitama. It's not uncommon to find fanart of him and Saitama together.
    • Many of the members of the Monster Association:
      • Psykos is well-liked for her evil cunning, her connection to Fubuki, and her... other assets.
      • Black Sperm's bizarre design and impressive powers quickly made him a fan favorite. The fact that he manages to survive the Monster Association war to stick around with Forte and Butterfly DX helps.
      • Orochi's battles have some of Murata's best-looking panels in the Monster Association arc, making him an audience-pleaser every time he appears.
  • Epileptic Trees:
    • How Saitama actually achieved his strength. The only explanations we've received in-setting are Saitama's description of his training (which was treated as a ridiculously insufficient explanation even by the other characters) and a fairly vague conversation between Zombieman and the head of the House of Evolution about "surpassing his limiter." As a result, theories have been popping up like mushrooms.
    • Who Blast actually is. Not diminished at all when it was eventually revealed that Tatsumaki knew Blast from her childhood, as his similarities to Saitama have generated even more questions. Also not helped by the fact, depending on how one interprets Tatsumaki's monologue, Blast is not really unreachable, but actually missing. Subverted when Blast makes a cameo when he meets Saitama and Flashy Flash during the Monster Association Arc. It is implied that Blast is on a mission to stop "God" and collects God's mysterious cubes, keeping them out of reach.
    • Who the entity Homeless Emperor calls "God" is and what plans they have in store.
    • With Word of God saying that both Boros and Orochi are above Dragon but under God, people have been speculating who will be the God-tier monster that will inevitably face Saitama in the future.
  • Evil Is Cool: Garou has a sizeable fanbase for his cool fight scenes and Anti-Villain tendencies. Ironic, considering how bad he is at being evil as Saitama points out.
  • Evil Is Sexy:
    • Mosquito Girl: Despite being part mosquito, there is no denying that she is certainly attractive, even to a point that her good looks won over enough fans to be place 9th in the character poll.
    • Speed-o'-Sound Sonic: A handsome Bishōnen wearing a very form-fitting ninja suit that shows off his slender, yet muscular, figure. Even though he occasionally plays the role of Anti-Hero, he still counts.
    • Slingshot S (or "Do-S" depending on the translation): Another Cute Monster Girl much like Mosquito Girl, but has a more human appearance. Her super revealing BDSM outfit certainly shows off her well-toned, voluptuous figure.
    • Psykos has entered the trio of beautiful psychic women, despite her crazed love of destruction and desire to destroy the Hero Association.
    • Bizarrely enough, there is a section of fans that finds Lord Boros attractive. It helps that he's a parody of bishounen villains.
  • Fandom-Enraging Misconception: Fans of American comic book superheroes will get annoyed at the less informed reader of One Punch Man, since while it parodies certain aspects of the Superhero genre, One Punch Man is more of a parody of the Japanese superhero tropes. This gets especially annoying when some fans proclaim that heroes like Superman and similars should be more like Saitama or that the latter is the best example of the former, which will annoy fans.
  • Fandom Rivalry:
    • With Dragon Ball. There have been wars over whether Saitama is stronger than Goku or vice versa. Ironically, One Punch Man is an affectionate parody of shounen tropes with characters being expies of Dragon Ball characters (such as Vaccineman and Boros). Still, that doesn't stop fans from comparing who is stronger of the two. Dragon Ball Super in particular has a huge rivalry with the One Punch Man anime. The animation problems of Super has been a mocking point by fans of One-Punch Man since that series has some of the best animations in the industry thanks to Madhouse. Dragon Ball fans were quick to reply that the animation of One Punch Man would naturally be better since the budget only had to satisfy a dozen episodes, while the animation budget behind Super had to continue indefinitely.
    • A similar example with Superman, probably as an extension/consequence of the ongoing rivalry with Goku. While this particular rivalry can get nasty since both fans tend to use the no-limit fallacy when discussing who's stronger than who, what really ticks off Supes's fans is when discussing who is the best character in terms of characterization and heroism. It doesn't help that Superman fans have been having some controversial movies where Superman characterization is less than stellar in their eyes.
    • My Hero Academia is also victim to this, due to fans unfairly comparing it to this, and some even going so far as to call it a rip-off, even though there have been other superhero-themed anime and manga before.
    • A much smaller rivalry has developed with the niche but dedicated fandom for Concrete Revolutio: Choujin Gensou which aired during the same season as One-Punch Man and also revolved around superheroes. While One-Punch Man quickly became a mainstream hit in the anime community, Concrete Revolutio remained very obscure and only got recognition from anime bloggers and critics.
  • Fanon: Garou's horned monster form was named "Awakened Garou" by the fans, but has yet to be officially referred to as such.
  • Foe Yay:
    • Sonic's obsession with defeating Saitama shows signs of this. The anime furthered this with Sonic jumping towards Saitama for an attack but Saitama's fist ended up touching his genitals, although he apologized that he didn't mean to do that.
    • In Chapter 43, Sonic seeks out Saitama to fight him again in order to show his newfound strength. Predictably, Genos doesn't take too well to that, and the confrontation scene reeks of an ex meeting the new Clingy Jealous Girl girlfriend.
    • Garou and Metal Bat have quite a lot of shipping in the fandom after their fight in Chapter 57. The rule still stands: if two pretty anime men have a grueling battle, they will be shipped together.
    • The dominatrix-esque Do-S provides a rare Les Yay example during her fight with Fubuki/Blizzard. Do-S spent a good chunk of their fight saying some pretty suggestive things toward Fubuki while trying to turn the esper into her "love slave". Do-S even claims that she "wanted her more" when Fubuki was able to resist Do-S mind control.
  • Friendly Fandoms:
    • There's been quite a few people that have noticed how much the series has in common with Empowered, what with all the superhero parody, kooky powers and supposed "loser" main protagonist. Not to mention that when it stops being funny, it REALLY stops being funny.
    • Fanarts comparing Saitama and Gudetama are also popular due to their similarities, from being lazy, looking like eggs (one is a literal egg while the other is usually drawn with an egg-like head.), having the same color scheme, and the fact that both their names end in -tama (from "tamago" meaning "egg" in Japanese).
    • With Fallout 4, weirdly enough, thanks to a mod that can customize the player character to look like Saitama and can even one punch all enemies with max stats. Basically, a god-mode mod for players to have fun with.
    • Obviously one with Mob Psycho 100 due to both works sharing the same creator (ONE).
  • Genius Bonus:
    • The Tree of Evolution shown behind Dr. Genus in Episode 3 is Ernst Haeckel's Tree of Life.
    • Why is Mosquito Girl a female? Because only female mosquitoes drink blood. That being said this applies only when they're pregnant, but still suits her given her reliance on her "babies".
    • In OVA 10, Garou and Suiryu fight. At one point, Suiryu begins fighting with moves similar to Drunken Style martial arts. This is because Suiryu was originally planned to use Drunken Style, but this was changed to the fictional Void Fist.
    • When Tatsumaki rescues Child Emperor with one of her barriers, she makes sure to keep holes in the bottom to let the water inside pour out. She even adds a hole at the top of the barrier to let the water drain more efficiently.
  • Growing the Beard: For fans not entirely sold on the series beforehand, due to seeing little plot to help support the Awesome Art and comedy, the Boros arc and the succeeding chapters act as this since it's where the focus starts shifting from Saitama to other characters to help further flesh out the world, as well as being the point in the series where it became Darker and Edgier.
  • Harsher in Hindsight:
    • One of the manga covers has the text "Being adult is looking good in black", featuring several characters with cool clothes. It becomes this when you realise that around that time, Murata's father died.
  • Hilarious in Hindsight:
    • Yuuichi Nakamura's role as Licenseless Rider is pretty hilarious if you take into account he's the Japanese dub voice of Captain America in the Marvel Cinematic Universe.
    • The same goes for Hiroki Yasumoto (King), which is the Japanese dub voice of Aquaman.
    • The fact that there's a powerless bike-themed superhero constantly getting Overshadowed by Awesome, and it isn't The Bmx Bandit.
    • Kenjiro Tsuda (Atomic Samurai) is the Japanese dub voice of Kylo Ren, another swordsman, except being evil.
    • One for the Dub: Remember the time when some ballsy redditors covered the OP, and someone went full Large Ham screaming "IT'S BARGAIN DAY AT THE SUPERMARKET!!!"? Dub!Saitama says the line word for word in episode 3.
    • Licenseless Rider's main concept was a Kamen Rider parody without a license who rode an ordinary bike that he occasionally attacks with. Thanks to Kamen Rider Ex-Aid, there's now a license-less rider (though it's more like an unlicensed doctor who's a Kamen Rider) and a rider who rides a bike that he pedals and uses for attacks.
    • Pig God's hero name has been slightly modified in the Italian translation of the manga, since translating it literally results in a quite widespread, but also quite blasphemous, exclamation against the Omnipotent.
    • Given the rivalry between One Punch Man and Superman fans, it's fairly hilarious that after getting cast as Saitama for the English dub, Max Mittelman almost immediately followed that up by taking over as one of the primary voice actors for Jimmy Olsen, aka Superman's Pal. And then he topped it by going on to voice the Man of Steel himself.
  • Hype Aversion: Like every anime season, there's one show that gets more hype and promotion than others, and OPM was no exception, especially when it was revealed Madhouse were animating it. So, of course, lots of potential watchers are turned off by the more overzealous fans claiming it to be "Anime of the Year" and actively refuse to watch the show as a result.
  • I Am Not Shazam: Despite what people may believe, Saitama is not actually called One Punch Man. If anything, he should be called by his hero name: Caped Baldy.
  • Jerkass Woobie:
    • Tatsumaki, who was taken from her family at a young age and used as a guinea pig for years because of her psychic powers. She was even isolated from the outside and denied any contact with her parents or sister. Eventually she stopped using her powers out of spite, but it only led to her being thrown in a cell until she started using them again. Even when an experimental creature went on a rampage, Tornado still didn't use them and was only saved by Blast stepping in to kill the monster, after which he told her not to expect someone to come save her every time. It led to Tornado's current worldview, being bitter at the world and believing that she can only rely on herself and that connection to others and coexistence are pointless. It also led to her being overprotective of Blizzard which of course has led to their strained relationship, Tornado being a meddlesome, stifling control freak in Blizzard's life who thinks she knows what's best for Blizzard. All in all, Tornado is a giant bag of issues due to severely traumatic experiences as a child which could have been avoided if someone had shown her basic decency.
    • Garou. He was bullied by the other kids in school for sympathizing with the monsters on TV shows and for not playing along with their hero games on the playground. When school authorities got involved, he was victim-blamed for not conforming to the other kids' standards. Because of this, he's always felt like a universally-hated underdog, and it's part of why he goes on his self-destructive crusade to knock heroes down a peg and become the ultimate monster. And despite all of his violence, he never truly intends to kill anyone — he just wants to give the little guys of the world a chance to get back at their oppressors. Makes it hard not to root for him, or at least get him a hug.
  • Just Here for Godzilla: Saitama is what most people know the series for, and people will often watch the show to see his one-punch antics completely unaware of the rapidly-developing plot that lies beneath.
  • Launcher of a Thousand Ships: Saitama. If one looks at fanworks, he's shipped with everyone, with the most popular pairings being with Genos (due to Ho Yay) and the sisters Fubuki and Tatsumaki (due to interpreting their relationship as Belligerent Sexual Tension). Not bad for a bald guy.
  • Love to Hate:
    • Several mysterious villains qualify, but the ones at the top are Boros and Garou. Boros for being the first enemy to survive Saitama's punch and giving what fans consider one of the best fights in the series. Garou for being a crazy awesome villain that defeated the S-Class heroes and would have won if it wasn't for Saitama.
    • Another is the civilian from the Sea King Arc, dubbed Frog Lips by fans. A real jerkass who starts bad-mouthing the Hero Association by pointing out a B-Class hero was able to beat the Sea King in one punch while none of the others could, and being quite the Ungrateful Bastard. He may have only ever shown up once, but few characters are so much fun to loathe.
  • Memetic Badass:
    • Saitama. In particular on VS forums where 'one punch' is the answer to many debates involving him. Hilariously, it's not a status he has in-universe. It's gotten to such a point that he rivals even Chuck Norris as the biggest Memetic Badass of all time.
    • Mumen Rider, oddly enough, despite his track record being the exact opposite, has developed this reputation almost as much as Saitama, but for the exact opposite reasons. He has no powers, he never wins a fight, and he never even slows the villains down — and he just. Keeps. Coming.
    • King. After all, he's the strongest man in the world. Or not.
    • Watchdog Man. A lethal joke character that wears a dogsuit that is guarding one city declared a hotspot of monster activities and shown ripping a monster head nonchalantly in one panel.
    • After his absolutely insane battle with Saitama, Lord Boros easily reached this status. Exemplified by the fact that he withstood three of Saitama's attacks, and had enough life left to have a final chat with his opponent.
    • Garou, after curb-stomping nearly every S-Class hero.
    • Phoenix Man, for his sudden power boost that rivals even the Monster Association cadres. Murata has also redrawn Phoenix Man's fight with Child Emperor multiple times, leading to jokes that Phoenix Man's resurrection powers traverse time and space. He even brought the Narinki Squad back to life.
    • The hot-dog monster somehow got a reputation of being a god-level threat that could end humanity.
    • Due to him sharing his initials with Awakened Garou, a Fan Nickname of said character which refers to the time frame he occupates at the end of the Monster Association arc, there are jokes about how Armored Gorilla played a huge role at the end of the Monster Association Arc.
    • Any objects that are somehow undamaged by Saitama when he hits them, like his alarm clock or table.
    • The mosquito in Episode 2 is considered as such being the one thing Saitama cannot hit.
    • On a meta level, due to him delivering a ton of high-quality artwork updating the manga regularly, many fans will mention how Murata broke his limiter.
  • Memetic Loser:
    • It's not that uncommon to see various comments on how Caped Baldy is a fake hero that doesn't deserve his status or reputation and only managed to improve his hero rank by doing things like hanging out with S rank heroes or stealing monster kills from more deserving heroes. Bonus points if the said hero is King.
    • Genos has such a reputation of getting trashed by his opponent that anytime he prepares to fight, fans are just counting down to how long he goes before losing at least one limb.
  • Misblamed:
    • Some people blame Murata for making the story longer in the manga by adding "filler" to the story, such as the Super Fight arc. However, everything added to the manga is either ONE's idea or an idea approved by ONE himself (meaning any kind of "filler" is actually canon). If anyone's to blame, it'd be the original author himself.
    • There are plenty of fans who claim J.C. Staff is a "bad studio" because of season two's poor quality, and believe that Madhouse is a "good studio" in contrast. However, this is disregarding all the talented animators who were commissioned for season one who didn't actually work at Madhouse at the time. J.C. Staff did drop the ball to some extent, but the real reason it wasn't as good is because it didn't have a dream-team of Japan's best animators working on it anymore.
  • Most Wonderful Sound: Hearing Saitama's punches connecting with some poor monster is damn satisfying — the sound effect itself resembles a mixture of gunfire and realistic, meaty impacts with plenty of reverb, sort of like a weightier version of Star Platinum's punches. Unfortunately, the only time we get to hear it at length is during a fight that turns out to be All Just a Dream.
  • Moral Event Horizon: Several villains cross it over the course of the series with their attacks on cities and civilians, justifying their deaths at the hands of heroes, especially Saitama, but some are more notable than others.
    • Deep Sea King crosses it when he attacks a little girl with acid just because she was cheering for Genos.
    • Boros and his crew cross it when they devastate A-city because the former was looking for a worthy opponent.
  • Older Than They Think: Due to Adaptational Displacement, you'd be forgiven for thinking One-Punch Man started around 2015; in reality, the original webcomic has been going since 2009.
  • One-Scene Wonder:
    • This is bound to happen to every Monster of the Week thanks to being one punched by Saitama.
    • An unnamed monster who looks like a Cute Monster Girl fusion of some sort of cat or zebra with a bell around her neck has noticeably been making the rounds, particularly in the NSFW area. Not bad considering her only appearance is being one of the poor Mooks being absorbed into Orochi's Heart Element form (although that might actually explain the abundance of NSFW art around her).
  • Periphery Demographic: The show got wider audiences with the announcement of the anime, but the fandom did not explode until it was actually aired on TV. It attracted even casual and non-anime viewers thanks to its newfound popularity and humor.
  • Rescued from the Scrappy Heap:
    • Fans were initially lukewarm towards Monster King Orochi. Being a manga-original creation who was given position over favorites like Black Sperm, on top of having an initially boring design and bland personality, many were disappointed that a perceived Dumb Muscle for Gyoro-Gyoro had such an important role. Once Orochi's backstory was revealed and he had his fight with Garou, revealing a frightening and awe-inspiring transformation and demonstrating abilities like breathing white fire, mastering techniques at a glance, and summoning dragons from his body, fan opinions began to change. To top it off, Word of God claimed Saitama wouldn't kill him with one punch! Fan respect skyrocketed, even to the point where fans were relieved to see Orochi's return after his first defeat at the hands of Saitama.
    • While Sweet Mask was not outright hated, he was considered a rather bland Knight Templar Bishōnen hero. However, once his backstory as an ugly human who became a mysterious being was revealed. Along with showing more parts of his personality which are surprisingly noble. Fans now appreciate him more and genuinely want to know what will happen to him, especially since his identity was revealed to the public with Saitama helping him escape and Neo Heroes hunting him down.
  • Rooting for the Empire:
    • In a weird sense, that it's not out of sympathy with the villains, but sympathy with the hero. A few fans have admitted that they couldn't help rooting for villains during a couple of Saitama's "battles", if only for the desire to see someone that can be a Worthy Opponent for Saitama. Examples include Sonic, Boros, and Garou.
    • Played straight at other times, whether it's because the so-called heroes are acting like dicks or the villain/monster is just too cool.
  • She's Just Hiding: Mosquito Girl, by virtue of having merely been sent flying by Saitama's swat, when the monsters he hits usually end up in Ludicrous Gibs (even the bloody smear she leaves on a building in the anime can be explained away as the result of her blood sack rupturing on impact). It doesn't hurt that Murata has published drawings of her as a worker in Genus' takoyaki stand, complete with prosthetic limbs and a bandage above her buttocks, where her abdomen used to be.
  • Shocking Moments: The series as a whole is full of this, from Saitama punching Vaccine Man in one hit, to punching a meteor, fighting an alien leader who can destroy worlds, (and who kicked Saitama to the moon!!!) an enemy who can defeat nearly all S-Class heroes, and finally fighting Tatsumaki herself.
  • Signature Scene:
    • Saitama's encounter with Boros, particularly when the latter loses his armor. This includes Serious Series -- Serious Punch!, being an amazing way to finish off the first season.
    • Saitama's practice bout with Genos as a whole is often cited to show off the series' animation quality, and the Death Punch scene tends to be parodied often.
    • Mumen Rider's Heroic Resolve when he takes on the Sea King despite knowing that he can't win. Pretty much everyone agrees that this is the very definition of being a true hero.
    • Garou vs. Tanktop Master and the Tanktopper Army is often cited as a highlight of Season 2, which was regarded as otherwise unremarkable.
  • So Okay, It's Average: The second season of the anime was met with middle-of-the-road reviews from critics. It was praised for its expansions on the One-Punch Man universe and its attempt to tell a longer and more involved story arc (especially the inclusion of Garou), but the lackluster production was seen as holding it back and limiting its effectiveness. Partially in effect due to Tough Act to Follow, considering how well-received the first season was.
  • Special Effects Failure: The anime sometimes places a metallic texture on metal objects such as robots or armor. While the same technique was used in Season 1 to great effect, it is used much more often and looks a lot worse in Season 2. This metallic texture was used in a lot of unnecessary places and makes characters such as Genos and Superalloy Darkshine look grimy and overly detailed compared to their Season 1 designs. Fortunately, many scenes were retouched in the Blu-Ray releases to make the textures less gaudy, but they're still very present.
  • They Changed It, Now It Sucks!:
    • There are webcomic-purists who disapprove of the changes present in the manga (such as the addition of Super Fight or Orochi), believing ONE's writing shouldn't be tampered with, despite every change is made by ONE himself.
    • Many were disappointed when the anime did not show the flip-book like scenes from the digital manga the series is famous for, instead of using the tankobon versions of the scenes.
    • For Season 2, many weren't happy with the speedy pace of the season which rushes through the story and doesn't allow time for other characters or scenes to really showcase themselves. The Garou vs Metal Bat fight, for instance, is over before it starts and many of the hero-versus-monster bits are shortened. Might borderline on It's Short, So It Sucks!.
    • Older fans are often disappointed by the official Viz English translations of character names, preferring the names from the fan-translations instead. In fact, many fans continue to refer to characters by their fan-translated names, which can cause some confusion when everyone has at least two names. Some examples of Viz's translations include:
      • Tatsumaki became Tornado, and Fubuki became Blizzard. The Blizzard Group also became the Blizzard Bunch.
      • As for monsters: Black Sperm became Black Spermatozoon, Elder Centipede became Centichoro, and Fuhrer Ugly became President Ugly.
  • Tough Act to Follow: The first season of the anime was cited as one of the best-animated and funniest shows of 2015, by casual and hardcore anime fans alike. A change of production teams and super-high fan expectations made it hard to follow up such a masterpiece with the second season.
  • Unfortunate Implications: Oh boy, Puri Puri Prisoner, a character who is basically every negative caricature of gay men given flesh. The series tries to play him for laughs but many fans, particularly those in the LGBT community, are less than amused. Though this has been toned down recently in the manga (read as: he doesn't openly rape people anymore), he's still a huge stereotype. It really doesn't help that he's one of the only openly-gay characters so far.
  • Unpopular Popular Character: In-universe, Saitama is hated by nearly all citizens, save for a chosen few, for thinking he cheated on ranks and took credit from others' work. It's not helping that he is encouraging this mindset to let the others look good. Yet this is exactly the reason why fans love him outside the show, to the point where he's at the top of the character polls.
  • Vanilla Protagonist: Invoked with Saitama. In his own words, he's just "a hero for fun" and his backstory is nothing more fantastic than "former salaryman does strength training until his hair falls out". He is a plain guy, his ungodly strength aside, and has no other defining features in contrast to the more colorful side characters like Genos. In the webcomic, even his drawing style feeds into this trope because he looks like a stick figure instead of a more detailed form like the other characters. As we find out, the webcomic explained that he truly is an unremarkable person that was able to break his limiter through sheer determination in exchange of becoming bald and being alienated from humanity.
  • Viewer Gender Confusion:
    • Sonic. None of the characters have difficulty telling that he's a guy, which is likely due to his voice.
    • Lightspeed Flash confuses viewers for the same reason as Sonic, what with his flowing blond locks and slender frame.
    • Okamaitachi, though it's a bit on purpose — he is a Crossdresser.
    • Manako is a female, but you wouldn't know that unless she told you.
    • A rare example of Viewer Race Confusion is present with Superalloy Darkshine. He has many of the characteristics of a stereotypical African man, but in a flashback, he is shown to be lighter-skinned; in reality, he just has so much bronzing and spray tan on that he appears black, referencing a real-life bodybuilding practice.
  • Visual Effects of Awesome: The second season's hand-drawn animation quality definitely suffered, thanks to the sudden and rocky transition to J.C.Staff. However, one thing they did get right was the CG-animated characters, such as Elder Centipede. CG in anime had obtained mixed results throughout most of the 2010s, and it was refreshing to see CG animation that finally didn't clash too much with the traditionally-animated environments and characters.
  • What an Idiot!: Who in the Hero Association thought it would be a good idea to release a Hero Catalogue to the public that not only reveals the locations of where the heroes are but also where they are usually seen? Why would they have entries about their "secret" moves? Did it ever occur to them that villains, like Garou, might also look through the catalogue?
  • The Woobie:
    • Saitama himself. He doesn't really act like one, but it's clear that his story-breaking powers have taken their toll. It's first evidenced in earlier chapters when he reflects on how every fight is boring and how even with his deeds, no one recognizes him. Later on, during his fight with Boros, Boros has a Not So Different moment with Saitama, claiming how he himself was the strongest person on his own planet, to the point he searched the universe for a worthy opponent because he wasn't able to take any pleasure in fighting anymore. His final words to Saitama hit home when he acknowledges the pain that comes with it and how they couldn't have a proper fight with our hero holding back. Saitama simply walks away without any words and a sad look. Later still, after the manga's tournament arc, comes a conversation with King where Saitama finally talks about his growing emotional detachment with someone, his lack of interest in virtually everything except the thrill of combat, but also showing that he may not be completely emotionally numb yet.
    • Blizzard, a woman whose innate talents made her believe she was destined for great things. But her sister is Tornado, who is the second strongest hero on the planet and crushed Blizzard's self-esteem, making her believe she could never be anything more than second best. Furthermore, she was picked on as a kid for having her powers in the first place, and her sister protecting her only alienated her further, leading Blizzard to resent her sister.

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