History Webcomic / OnePunchMan

** The biggest example would probably the Monster Association Arc to date, to the point that arguably, the manga is its own continuity only occasionally borrowing elements from the webcomic in comparison to the earlier arcs, where it typically follows it beat for beat.

* AdaptationRelationshipOverhaul: As a result of the trope above, the manga allows some relationships to deepen and form new dynamics that didn't previously exist in the webcomic, particularly the MA Arc:
** Saitama and Genos is the most obvious example. They're far closer than their webcomic counterparts, being genuine friends, and actually [[spoiler:have Saitama rely on Genos to serve as his MoralityChain and LivingEmotionalCrutch.]] A stark contrast to their webcomic dynamic, that while they do genuinely care for one another, Saitama is far more callous and and distant with Genos, while the latter feels neglected and downright ignored by Saitama despite the two months of "training" he had under him.
** Another would be Tatsumaki and Fubuki. Webcomic Tatsumaki is not only extremely controlling and emotionally abusive, she's not above hurting Fubuki or taking comtrol of her, invoking understandable deep rooted fear and trauma in Fubuki, to the point the latter doesn't have the heart to save her and eventually goes no contact. Manga Tatsumaki while still controlling and disrespectful of Fubuki, has never raised a hand against her and based from the doodles from the manga, do make an effort to be a good older sister and hero and occasionally hangs out with Fubuki. Fubuki on the other hand has taken Saitama's words into heart early and got over her fear towards her sister, wanting to save her this time from herself. It changes their relationship from abusive to troubled but not unsalvagable.
** CE and Zombieman develop a younger brother - older brother relationship, thanks to the latter reaching out and being kind to the former, changing CE from being jaded by the adults around him to fully realizing them as flawed but nuanced people.
** Mumen Rider and Tank Top Master form a friendship on genuine respect for one another and mutual ideals during their teamwork at the hospital they were admitted at, and later during the evacuation of Z city.
** While it's implied Bang had a soft spot for Garou in the webcomic, they're not so close that Bang at some point needed Bomb's help else he might kill Garou and never bpthered to search for him after Garou ran away. Whereas in the manga Bang put his life on the line to ground Garou's humanity, searching for him for days, and eventually serving as his guardian as he retrains him again to shape him up to be his succesor.

** The biggest example would probably the Monstwr Association Arc to date, to the point that arguably, the manga is its own continuity only occasionally borrowing elements from the webcomic in comparison to the earlier arcs, where it typically follows it beat for beat.

* BoxingLessonsForSuperman: Bang attempted this with Saitama and Genos. Neither went for it, the former because it would be pointless and the latter because he has the "best defense is a good offense" mindset.

The series has been wildly popular, with the [[http://galaxyheavyblow.web.fc2.com/index.html ongoing webcomic]] being adapted into a [[http://tonarinoyj.jp/manga/onepanman/ manga]] drawn by Creator/YusukeMurata of ''Manga/{{Eyeshield 21}}'' fame, an English serialization of said manga in Creator/VizMedia's ''Weekly Magazine/ShonenJump'', a drama CD, a Fall2015Anime adaptation from Creator/{{Madhouse}}, several {{OVA}} videos from December 2015 on, and an April 2019 second season anime by Creator/JCStaff.

** When the Hero Association first started, most of the future S-Class heroes were very low ranked due to not caring about rankings or showing off, such as Superalloy Blackluster being the lowest ranked hero of all. The highest ranked of any of them seems to have been Bang, who was still near the bottom of B Class.

* AntiClimax: Saitama literally has to dream of a fight that actually challenges him. Almost no matter how mean-looking or powerful the enemy appears at first, the moment Saitama decides to attack IS the end of the fight.

* ArtisticLicenseBiology: Lampshaded with Saitama's training. While 100 pushups and situps per day should be relatively easy for most fit adults, with 100 squats being slightly harder, running 10 km per day without rest would destroy your leg muscles, especially with how little protein Saitama ate. Dr. Genus notes how Saitama's strength comes from his determination breaking his limiter instead of any specific training, which is presumably also what kept his muscles intact despite his training regimen.

* ArtisticLicenseMedicine: After Bang rescues Tanktop Master from Furher Ugly, he notices his heart's not beating, prompting Genos to activate his built-in defibrillators. Although Bang revives him with "Tanktop Magic" before Genos can try, you're not supposed to shock asystole anyway, which you treat with CPR and vasopressors. Defibrillation is meant to treat irregular heartbeats, not restart the heart.

** The Monster Association is a villain of group [[WasOnceAMan humans turned monsters]]. Some of their members are arthropod creatures such as Awakened Cockroach, Centichoro and Bug God.

* BadassNormal: In the second issue, we get a flashback to the time before Saitama gained his incredible strength, when he fought a crab monster with nothing but normal human speed, strength, agility, and a necktie. [[EyeScream He won.]] Also, a fair amount of high-ranking heroes are simply average-looking people who happen to have some CharlesAtlasSuperpower.

* BigDamnHeroes: There are plenty of Saitama’s feats of strength and speed shown throughout the series that he can effortlessly move at the Speed of Sound and push it to the Speed of Light if he so desires, but like anything hinging on Saitama’s character he needs to be motivated enough to show it off like that; with that there are examples of Saitama simply arriving late, or being misdirected from reaching the place some big commotion is happening as he just casually strolls (or runs in human speed) to his destination instead of just arriving in lightning strike accuracy, that results in Saitama coming up dramatically when all hope seems to be lost or when there’s no one left around to witness his real power, perpetuating the narrative that very few people know how powerful Saitama really is.

* BlessedWithSuck: Saitama wanted to be a superhero who could blow away evil with a single punch... which as it turns out was incredibly boring. Now battling villains and monsters are about as exciting as a trip to the grocery store to pick up a gallon of milk.

* CallBack: Chapter 22 has the same opening shot of Z-City as Chapter 18, only this time, Z-City is heavily damaged by the debris of the giant meteor.

* CassandraTruth: When Saitama reveals that the secret to his incredible power consists of essentially body weight exercises and running (it's just 100 situps, 100 pushups, 100 squats, and a 10km run daily), none of the other characters believe it. Genos in fact claims it's a flat-out lie, saying that no one could get as powerful as him just doing that. It's kind of justified, as that kind of workout, while not easy, isn't insanely difficult either -- Olympic athletes and special forces members do that kind of thing as a ''warmup''.

* ChekhovsGunman: [[spoiler:The boy who Saitama saved in his OriginStory has a grandfather who's a multimillionaire and thus founded the National Superhero Registry. The grandfather founded it exactly three years ago after hearing how Saitama saved his grandchild.]]

** It is revealed that there is a group called the "Hero Name Victims Association", comprised of heroes with terrible names. With how many aliases the Hero association hands out like candy, it is not surprising that the ones who received a rather terrible hero name would eventually unionize due to the disrespect.
*** They want Saitama to be their executive, despite his usual reputation, he is still an A-class hero who fits the criteria for their group, making him the most respectable figure to represent them.

*** As a whole their first day is a reminder why Demon-level threats and above are so dangerous, if they were easy to beat, the Hero Association wouldn't have any of the problems they are currently facing nor would the S-Class exist.

* DrunkenGlow: OVA 6, a drunk Tatsumaki is shown with a distinct drunk Blush Sticker. She's also uncharacteristically happy given her tsundere personality.

* DudeWheresMyRespect: Despite killing hundreds of monstrosities in his early career, Saitama never got the credit for his actions because he wasn't in the Hero Association. When he does join, his barely-passing score on the written test puts him near the bottom of C-Class. Since no one can believe a C-Class hero is actually capable of such feats, rumors start that he's stealing the credit for other heroes' work, resulting in him getting panned by civilians and fellow heroes alike.

** In Murata's version, you can see [[spoiler:King among the bystanders]] while the Paradise group is destroying the golden turd.

* EarlyInstallmentWeirdness: Early chapters had Murata at his most artistically free ways, some chapters were very experimental, like one chapter devoted to a single fluid fight sequence as if the manga pages were animation cells, and another fully colored chapter just about Metal Knight taking flight; while these chapters had an unique feel to them, in the end those chapters proved to be a problem for the published volume releases, forcing a different numbering of chapters and some sequences had to redrawn to fit properly in the volumes; later on Murata is found being more contained to traditional manga panels, reserving his artistic signature to some double spread pages, thus never being troubled by the volume releases again.

* EventFlag: Lampshaded in the fight with Garou, when Saitama, who had been excited at the prospect of finally getting a decent fight, starts to get angry when Garou keeps hitting obvious "loser flags" with his hokey villain monologue.

* ExplosiveOverclocking: Boros' Meteoric Burst

* FreezeFrameBonus: In TheStinger for Episode 9, if you look closely at Madame Shibabawa's mouth while she's shouting, you can see the cough drop that ends up killing her.

* FromZeroToHero: While Saitama starts as a would-be salaryman with no real goal in life, he realizes he wants to be a hero and starts training like mad. However, when he finally reaches his goal: being able to lay waste to any villain or monster with a single punch due to his ''ridiculous'' strength, he becomes ''really'' bored with this. Subverted in that, despite his heroism, nobody recognizes his feats and sees him as a very plain hero, even though he is anything but. Though admittedly, he does still ''look'' like an average guy and acts like one when he is not fighting.

* GlowingEyesOfDoom: Various characters eyes will glow with a mysterious light to make them looks more badass or scary at that particular moment, such as Saitama and Genos when they defeat monsters, or Dr. Genus when he falls into the depths of his ForScience research madness.

* GracefulLandingClumsyLanding: [[ComicallyInvincibleHero Saitama]], is so overpowered he can kill any monster with a single punch. When he confronts the alien warlord Lord Boros, Saitama delivers just such a punch, pulverizing his armor and launching him across his throne room to slam into a supporting pillar. Boros falls from the impact crater and lands on his feet, revealing that he's strong enough to take Saitama's punches, the first enemy he's ever faced to do so, and raising his hopes that [[NoChallengeEqualsNoSatisfaction he's finally found a challenging fight.]]

* GroinAttack: Saitama does this to Speed-o-Sound Sonic. [[spoiler:The ninja survives, as Saitama wasn't actually trying to attack him; Sonic fell onto Saitama's fist]]. He does it again in a special chapter, accidentally elbowing an attacker coming from behind in the groin [[spoiler:(coincidentally, the same ninja he'd accidentally groin attacked before)]].

** [[SpoiledBrat Waganma]] is a child of Narinki, one of Hero Association's Executive who, due to that status, he thinks the Hero Association exists to [[EntitledBastard cater to his every need and whim]]. He also constantly takes from others, like he did to Tareo, and being UngratefulBastard to those helping him like insulting Child Emperor in his fights. Even worse, to ensure his own safety, [[ItsAllAboutMe he lied about Tareo being imprisoned too in Monster Association's HQ]]. Even [[MeaningfulName his own name]] is a play of words of "Wagamama", which means "spoiled", which he definitely is.
* HeelRealization: After Saitama defeats him, Garou asks why he became a hero. Saitama replies that, for him, being a hero is just a hobby. [[spoiler:Garou immediately flies into a rage ranting that a real hero isn't like that. This leads to Saitama's ArmorPiercingResponse that he settled on being a monster but really wanted to be the hero. This shocks Garou into stunned silence as Saitama accurately deconstructs his whole mindset and reasons for trying to become a monster. When he's finished, Garou quietly asks "[[AndThenWhat What should I do now]]?"]]

* HotterAndSexier: The original ONE version has only a few key female characters appearing in and out of story, the most recurring ones, Tatsumaki and Fubuki, are never said to be particularly beautiful by other characters and ONE’s simple drawings don’t put the sisters in {{Fanservice}} situations; Murata on the other hand really makes use of his high grade art style to make pretty much all female characters in the series have varying degrees of titillation, Tatsumaki and Fubuki have their beauty in display in every panel with [[FormFittingWardrobe borderline skintight outfits]], several daring cover pages that have Fubuki posing as if during a photoshoot session, like a gravure model; also if a new batch of heroes that didn’t exist in ONE’s version happen to have a new female amongst them, it’s very likely she will be a very alluring woman as well.

* IAmNotShazam: The web-comic is named ''One-Punch Man'' and it is intended to refer to Saitama as well as accurately capturing the essence of his powers and super-hero identity. However, he is never called "One-Punch Man" in-universe. Currently his assigned name with the Heroes Association is the "Bald Cape" (often dubbed as "Caped Baldy").

** S-Class hero Watchdog is a guy in a dumb-looking dog costume who [[CrouchingMoronHiddenBadass single-handedly takes care of Q-City, one of the biggest hotspots of monster activity]]. When he's introduced, we see him [[AtopAMountainOfCorpses sitting on top of a massive pile of monster corpses]].

* LethalJokeCharacter: Saitama has few adaptations to VideoGame/{{MUGEN}}, and as the source, the character is considered as this, since he only teleports or receives zero damage and one punch of him is a OneHitKill, no matter how powerful, cheap or broken is the opponent. [[https://www.youtube.com/watch?v=4eml4MNwC2c Here's a proof for one of these adaptations]].

* MesACrowd: The scientist who founded the House Of Evolution made numerous clones of himself to assist with research. They get turned into a RedShirtArmy.

* MrFanservice: Several male characters are walking eye-candy, predominantly Sonic or Garou, who regularly expose their beautifully sculpted bodies either because of their FormFittingWardrobe and ClothingDamage.

** In the Manga, Super Alloy Darkshine manages to do this to Evil Natural Water's water jets that can normally cut through stone and metal. Darkshine happily lets them wash over his muscles while posing because the water makes him even shinier.

** '''Saitama'''. His punches destroy monsters, leave massive holes in buildings, and are strong enough to destroy meteorites that a MacrossMissileMassacre and Genos' WaveMotionGun failed to damage.

* PowerMakesYourHairGrow: Inverted. Saitama's training made all his hair fall out.

* RealPlaceBackground: Apparently, [[https://static.tvtropes.org/pmwiki/pub/images/opmpart1.png Saitama's]] [[https://static.tvtropes.org/pmwiki/pub/images/opmpart2.png apartment]] does exist somewhere within Saitama Prefecture. City Z is in fact based on locations within the Saitama Prefecture. [[UpToEleven Even the whole continent is the shape of Saitama Prefecture!]]

** Saitama delivers one to Garou, calling him out on being just a jaded cynic who wanted to be a hero but couldn't, so he instead chose to "lower the hurdle right before the goal" and become a monster. Saitama calls Garou out on this mindset, especially when Garou loses to him, ending with an ArmorPiercingQuestion: "what about next time? What will you do next?"

* SamusIsAGirl: The cycloptic monster being forced to show Saitama and Flashy Flash around reveals their name to be Monaco. When Saitama comments that's a girly name, Monaco snarks back that she is a girl

** After the debut of [[spoiler:Psykorochi]] in the manga greatly upped the power scale of the Monster Association, truly looking like the most powerful foe around, the manga adjusted [[spoiler:Garou]] accordingly to still remain the biggest threat of the entire arc like he originally was in the Webcomic, his steps into [[spoiler:Awakening were revised with "God" being directly involved, amplifying Garou's powers to untold levels, to the point Awakened Garou vs. Saitama had to be moved away from Earth lest them destroy it as mere collateral damage from their fight]].

** Genos has a backstory similar to ''Franchise/{{KamenRider}}'', especially those of the Showa Era. There's also the ''Licenseless Rider'', who rides a bicycle to battle. His hero name in Japanese, Mumen Rider, is another pun on Kamen Riders.

* ShutUpHannibal: After landing a hit on Saitama, Boros takes a break to gloat about his superior regenerative power that should eventually grant him victory. Saitama interrupts him, clearly showing that he's neither fazed by the blow nor impressed by the talk.

* SixthRangerTraitor: A few of the S-Class heroes think there is a traitor amongst them. Child Emperor and one of the executives suspects Drive Knight because he disappeared during his recon of the Monster Association. It turns out that he was just being very thorough (as far as we know) and was maintaining total radio silence. To complicate things, he is adamant that Metal Knight, Child Emperor's mentor, is the traitor. Both of them have been acting in the interest of the Hero Association, but both are extremely pragmatic while being a little cold and heartless and both seem to have some ulterior motives. Therefore, it's hard to tell if either of them is the traitor. It could also be neither of them are, but the other S-Class heroes seem too self-centered and enjoy fighting monsters too much to be focused on being devious, calculated traitors... Except maybe Blast who's "retired" and has been missing for quite a while.

* SlidingScaleOfIdealismVsCynicism: Leaning more towards the idealistic end.

* SpitTake: In the anime, first episode of season 2, as they are both playing a video game while sipping on orange juice, Saitama asks King out of the blue why he fled the rampaging robot that Genos is now fighting. King immediately spit-takes.

*** Later on, the webcomic [[spoiler:reveals that Amai Mask himself is a monster which was part of the reason he became such a SociopathicHero. Ironically this trope now applies to Amai Mask himself once he reveals his identity as a monster to kill a mass murdering monster who was growing in strength. With his identity revealed, he lost all rights as a human and other heroes are allowed to hunt him down and kill him. This, however, is subverted by Saitama who does not see him as a monster, but rather as a someone currently finding his own way of becoming his IdealHero and helps him escape to accomplish that]].

* WorldOfJerkass: To a T. Aside from some civilians being UngratefulBastards, there are only a few legitimate heroes that you can count on your hands. The others are egotistical jerks who are slaves to their public image, another top-ranked hero willing to kill any monster even if they surrender, and the second strongest hero who is a BrattyHalfPint uses her PsychicPowers to bully and intimidate anyone she views as weak and/or annoying. And even Saitama, who is a JerkWithAHeartOfGold, has a constant "meh" attitude that irritates people InUniverse to high heaven. ZigzaggedTrope however - despite their harsh attitude and rude behaviour, many of heroes are still[[JerkWithAHeartOfGold good people]] [[HumansAreFlawed deep down]], that put their lives to protect the innocent, sometimes experiencing [[BreakTheHaughty tough lessons]] [[JerkassRealization in life]].

* WorldOfJerkass: To a T. Aside from every civilian UngratefulBastard, there are only a few legitimate heroes that you can count on your hands. The others are egotistical jerks who are slaves to their public image, another top-ranked hero willing to kill any monster even if they surrender, and the second strongest hero who is a BrattyHalfPint uses her PsychicPowers to bully and intimidate anyone she views as weak and/or annoying. And even Saitama, who is a JerkWithAHeartOfGold, has a constant "meh" attitude that irritates people InUniverse to high heaven.

* HurlItIntoTheSun: How [[spoiler: Garou]] attempts to kill [[spoiler: Saitama]] at the climax of their fight in the Manga. [[spoiler: It doesn't work.]]

* TheForceIsStrongWithThisOne: A few characters occasionally show the ability to detect "[[PowerLevels energy levels]]" of powerful beings, allowing them to determine their locations and threat levels. Some, like Genos, use mechanical means of detection, whereas others are completely biological and can still sense it. Almost no one reacts to Saitama's power level, suggesting it might just be too high to detect.

* SamusIsAGirl: The cycloptic monster being forced to show Saitama and Flashy Flash around reveals their name to be Monaco. When Saitama comments that's a girly name, Monaco snarks back that she is a girl.

* WhamEpisode: In Chapter 107 of the webcomic, on the downside, [[spoiler:after the Garou incident, the Hero Association has lost faith from the public, Saitama unintentionally damaged the reputation of Metal Knight (by destroying his defenses he built for the Hero Association) and Tatsumaki (his fight with her did serious damage to the cities they fought in causing complaints about her), so now the Hero Association will increase their surveillance on them, several heroes are retiring, including Bang, and Child Emperor gained a distrust for the adults in the Hero Association]]. On the upside, [[spoiler:Fubuki finally decides to move up to A-Class and Zombieman wants Dr. Genus' help to remove his limiter]].

On April 21, 2020, Creator/{{Sony}} announced a LiveActionAdaptation of ''One-Punch Man'' was in the works, with writing by Scott Rosenberg and Jeff Pinkner, the same writers behind ''Film/Venom2018''.

* DubNameChange: Too many to count, due to the LoadsAndLoadsOfCharacters nature of the series with all the heroes and monsters. Usually it boils down to keeping the original Japanese name or translating it properly into English (ex. Tatsumaki or Tornado), but there are a couple outliers changed for localization purposes (ex. Fuhrer Ugly or President Ugly).

* LoadsAndLoadsOfCharacters: New characters have been introduced at a steady pace, but starting with the sea monster invasion arc, over a dozen new A- and S-Class heroes are introduced.

* AdaptationDistillation: At the same time, the anime removes some references about arcs after Boros' arc, save for some cameos for the characters. For example, they removed Genos' reference of [[spoiler:the Blizzard Group's newbie crushing in Episode 7]].

* GlowingEyesOfDoom: Various characters eyes will glow with a mysterious light to make them looks more badass or scary at that particular moment, such as Saitama and Genos when they defeat monsters, or Dr. Genus when he falls into the depths of his ForScience research madness.

** [[KnightTemplar Amai Mask]] aka [[ThePerfectionist Handsome Kamen]] is the number one ranked A-Class hero in the Hero Association as well as the most popular hero with the public in-universe. [[GoodIsNotNice However his actual heroic ethic is anything but]]. He berates the S-Class heroes for not preventing City A's destruction, even though there was nothing they could have done to prevent it, despite frequently ignoring monster attacks to further his career as a singer/actor. [[SociopathicHero He is also a Sociopath, regularly executing defenseless or surrendering monsters and once even mercenaries he knew were being mind-controlled]]. It says a lot that when Tatsumaki, another hero disliked in the Association, says [[TheFriendNobodyLikes that everyone hates him, she really is speaking for all the other heroes too]]. [[spoiler:This becomes subverted later on: he becomes relatable when his backstory as a an ugly man who became a monster is revealed, because ironically it shows his more humanizing traits and a reason behind his behavior.]]

** [[OldMaster Silver Fang Bang]], Super Alloy Darkshine and Tanktop Master, and quite a few other heroes also apparently gained their own less extreme superheroic abilities through physical training.

* ArtShift: In Murata's version, Saitama is usually drawn incredibly half-assed, in stark contrast to the ridiculous level of detail given to almost every other character and background, reflecting his attitude toward everything. Whenever he starts taking things seriously and acts like a badass though, he's drawn in the detailed style. Tornado seems to adopt this tendency of normally being poorly-drawn herself when she's angry/pouting.

** The Volume 9 bonus chapter has the Blizzard group try to work to get themselves a new car, with Fubuki suggesting to use fliers for money opportunities and the majority of the group getting side jobs that only get them 3.5 million combined. Fubuki comes back with over 2 million alone, describing her getting it as having put her body on the line to do so. Mortified by their leader apparantly resorting to prostitution for the group, the other members vow to make sure she never does it again by working harder... before she reveals that she was out bounty hunting and said the fliers she was talking about were wanted posters.

** During Fubuki's challenge to Saitama and his "Saitama group" (composed of Genos, Bang, and King) in the hopes of making Saitama join the Blizzard group, the challenge was to beat the opposing group in a video game, with the loser submitting to the winner's commands. While Bang and Genos were eliminated easily due to being novices. Saitama boasts about having played the video game before and not losing easily. He ends up losing faster than both Bang and Genos.

* AFriendInNeed: Despite complaining about the way Genos follows him around, Saitama shows concern for him and even fights Asura Rhino on his behalf when he gets turned into [[ItMakesSenseInContext modern art]].

** After his brush with Asura Rhino:

** Asura Rhino's experience when he senses how powerful Saitama is. All the more terrifying because Asura Rhino was indicated to be the most powerful being encountered so far (stronger than even the several-hundred-foot tall giant from an earlier issue), and has never feared anything in his life, but in seconds, he goes from being a SmugSuper to screaming in fear and immediately breaking off his attack.

** Happens to Genos when he underestimates his enemy. Asura Rhino [[spoiler: defeats his Incinerate attack by just ''exhaling.'']]

** Asura Rhino, who is the first villain to be able to accurately gauge Saitama's power. Before doing so, he was supremely confident in his invincibility, but then his survival instinct kicks in.
*** In the same part Saitama suffers a massive one when Asura Rhino enters Carnage Mode for a week, [[spoiler:due to the fact of having forgotten that day was Saturday and he was missing grocery deals, thus he one-punched Asura in regret of having forgotten that.]]

* OneDialogueTwoConversations: While the Blizzard Group's out earning money to get a decent car, Blizzard returns with one-third of the amount in a short amount of time while the rest of the group are scraping by with their part-time work. After they question how she was able to do such a thing her dialogue makes it sound like she prostituted herself, until she explains she was capturing criminals for their bounties. Then it's revealed this is what she originally ordered her group to do in the first place, but they mistook her order as being to get part time work.

** Mosquito Girls starts mostly humanoid with various insect features. After absorbing her mosquito swarm, she TurnsRed and retains her human features while the insect ones become more pronounced.

* ThePiratesWhoDontDoAnything: The amount of heroes who actually ''behave'' like superheroes is very low. Silverfang at one point bemoans how many of the S-Class heroes are PowerLevel obsessed and don't act at all heroic after Tornado ends up scrapping Genos over a petty insult, and Licenseless Rider ends up holding top rank in the C-Class heroes despite being an unpowered {{Muggle}} because he's actually willing to ''act'' superheroic.

* ShipTease: In Chapter 102 of the webcomic, Fubiki doesn't react at all when Saitama claims to Tornado that he doesn't work for Fubiki despite her being desperate to get him in the Fubiki Group. She ''does'' react to him saying that he and Fubiki aren't friends. Then, she acts very dejected when he describes their relationship as just acquaintances. It's as if she felt that they were something more than that (though what she thought is unstated. Given her issues with relationships, she probably doesn't know what she thought, either).
** Tornado and Genos get a lot of teasing in the manga. When they are fighting together, Genos gets very physically close to Tornado, they banter, and Tornado becomes very shocked if Genos suffers damage. At one point, missing his arms and legs, he even crawls on top of her to protect her. Given that he probably has had the requisite parts surgically removed when he became a cyborg and she is emotionally and socially stunted, they probably don't and even '''can't''' see it as anything more than battlefield etiquette.

** The anime adds one: Asura Rhino's [[SuperMode Asura Mode]] transformation is colored purple with green lines, much like [[Anime/NeonGenesisEvangelion Eva-01]]. For bonus points, it's also an out-of-control berserker mode.

** Asura Rhino gets a greater build up, being talked up as the House of Evolution's best fighter and defeating Genos without going OneWingedAngel, but is still killed with one punch.
** The Deep Sea King tears through several heroes, including S-Classes Puri-Puri-Prisoner and Genos, before being [[RuleOfThree killed with one punch]]. A subversion because Deep Sea King was far weaker than some of the earlier monsters, including the aforementioned Asura Rhino, being only as strong as Subterranean King. Deep Sea King was only pitted against the weaker heroes first (Puri-Puri-Prisoner and Genos is also among the weakest of S-Classes) before getting killed by Saitama.

* ArtisticLicenseBiology: Lampshaded with Saitama's training. While 100 pushups and situps per day should be relatively easy for most fit adults, with 100 squats being slightly harder, running 10 km per day without rest would destroy your leg muscles, especially with how little protein Saitama ate. Dr. Genus notes how Saitama's strength comes from his determination breaking is limiter instead of any specific training, which is presumably also what kept his muscles intact despite his training regime.