Fanfic / One Punch Man: Hero's Harem

One Punch Man: Hero's Harem is a One-Punch Man fanfic by F-ckthesystem125 on Fanfiction.net

Power can bring about fear. Fear can lead to yielding. Yielding can lead to mercy. Mercy can lead to redemption. Redemption...can lead to so much more if given the chance. All of this proves very true when Saitama unknowingly amasses a harem of ladies through his interactions with them with delightfully chaotic results.

Zach150 has made a reaction fic on Wattpad with the author's permission. The link can be accessed here.

One Punch Man: Hero's Harem provides examples of:

• Adaptational Attractiveness: Most of the genderbent monsters are Cute Monster Girls instead of ugly monstrosities.
• Adaptational Badass:
  • Most of Saitama's girlfriends are a good deal stronger than their canon counterparts thanks to the training regimen that he devised for them, allowing them to push their limits on a constant basis.
  • Genos receives upgrades to his cybernetics that increase his firepower and durability thanks to the rare-earth minerals and ores that Subterranean Queen and her subjects retrieve from underground.
• Adaptation Deviation: Black Sperm is actually a female monster named Little Splitter in this continuity, with her 'Black Sperm' form being a disguise she uses.
• Adaptational Heroism: Many of the monster girls in Saitama's harem turn over a new leaf (or at least abstain from causing chaos) thanks in no small part to their newfound fear of death at Saitama's hands along with his genuine, unconditional kindness towards them.
• Adaptation Name Change:
  • Kombu Infinity is renamed Ki since the others decide it would be easier to refer to her by that shortened moniker instead of using her full name all the time.
  • Mosquito Girl renames herself Marissa after she decides to live with Saitama.
• Adaptational Nice Guy:
  • Maiko Plasma is a bit friendlier with others after meeting and befriending Midori and Lin Lin, who help Maiko grow out of her shell.
  • Lady Boros, in contrast to her canon counterpart, is not the one to initiate the attack on City A - instead, a trigger-happy gunner on her spaceship starts the attack by prematurely bombarding the city with artillery fire in a misguided attempt to curry favor.
• Always Someone Better: Every monster that has ran into Saitama know that he's far, FAR stronger than any monster or hero out there, and they are all too happy to remind everyone else that they are nothing compared to Saitama in the grand scheme of things.
• Asshole Victim: The gang of punks that Midori and Lin Lin take down are sent off to Puri-Puri Prisoner for whatever he does to them, but considering how they were going to rape them both, it's hard to feel bad for those hoodlums.
• Back from the Dead: Deep Sea Queen comes back to life after a corpse disposal worker accidentally spills his drink on her corpse.
• Bait-and-Switch: Chapter 24 sees everyone think that Vaccine Woman went and attacked humans again after she ends up on the news ... until she reveals that she broke into the Melon Pop drink factory to absorb all the cocaine the company had been slipping into its drinks, inadvertently helping Child Emperor blow the whistle on its shady dealings when the young hero ran into her.
• Balloon Belly: Vaccine Girl's belly swells to comical proportions after she eats a monster made of pollutants, gaining herself the Embarrassing Nickname of "Roly Poly Vore Girl" from the Heroes Association in the process. Luckily, all the pollution she eats grants her a growth spurt that restores her to her previous adult-scaled proportions.
• Best Her to Bed Her: According to Subterranean Queen, Subterranean law declares that anyone who loses to an enemy but lives becomes their slave. As such, he's now her master.
• Beware the Nice Ones:
  • Kogane's one of the nicer monsters among those who live with Saitama, yet is fully capable of making someone like Face Ripper back down by using her seaweed hair to crush his hand and tear off one of the faces sewn onto his body when he attempts to chop Nori's face off at the Monster Association hideout.
  • The same can be said for Nori, who, under her meek disposition, has a sadistic streak a mile wide that she gives Do-S a front-row seat to when the Dominatrix monster decides to attack Midori, using her seaweed hair to deliver a No-Holds-Barred Beatdown on Do-S before tying her up and nearly force-feeding her with enough seaweed to make her explode before Midori, Ki, and Kogane get Nori to stop.
  • Zenko may be a sweet (if somewhat bratty) little girl, but she can be just as menacing as her brother Metal Bat when she wants to, which she demonstrates by silencing the customers at the café Saitama and Nori are at for their date with a Death Glare when said customers begin making creepy and perverted comments about Nori's looks.
• Big Eater: Boros wolfs down all the food the Monster Association gives her at their headquarters due to her Healing Factor requiring massive amounts of calories to heal all the injuries she received from her battle against Saitama.
• Break the Haughty: As Beast Queen puts it, Saitama helped the monsters under his care realize that they're not so invincible as they thought they were.
• Breast Expansion: Several women in the story grow noticeably larger breasts and butts after eating Kombu Infinity's (a.k.a. Ki's) seaweed. Mizuki and Beast Queen don't notice due to eating small amounts on a regular basis, but Do-S, who was force-fed a considerable amount, complains about having grown two cup sizes.
  • Vaccine Woman and Deep Sea Queen both grow larger breasts in their super modes, with the former permanently becoming bustier as she absorbs pollution.
  • Tatsumaki also sees herself have a more prominent chest and butt and gets a growth spurt after eating some of Ki's seaweed.
• Bounty Hunter: Beast Queen takes up as a crimefighter for hire in chapter 25 to satiate her hunger for battle.
• Boxing Lessons for Superman: Some of the tamed monsters ask for combat training from veteran warriors so they can back their strength with actual combat capability. So far, Midori has asked to be Bang's student in chapter 18, while Subterranean Queen and Beast Queen became Nichirin and Bomb's students respectively in chapter 29.
• Bullying a Dragon:
  • A Sea Folk that shows up at City J decides it would be a great idea to insult Saitama by asking him if he's related to an octopus (a reference to his bald head) while Saitama is going on a shopping trip there with Vaccine Woman. Saitama instantly reduces the offending Sea Folk into Ludicrous Gibs with a single punch before continuing with his shopping trip.
  • Do-S attempts to brainwash Saitama after her defeat at the hands of Vaccine Woman, Nori, Deep Sea Queen, and Subterranean Queen. Saitama simply shrugs off her attack, breaks her whip into tiny pieces, and scares her into surrendering without even raising his voice.
• Butt-Monkey: Tank Top Tiger and Tank Top Black Hole serve as this, being frequently subjected to a number of Amusing Injuries and major humiliation from Saitama and the gang's antics.
• Clueless Chick-Magnet: Saitama practically has no clue that all the ladies he has interacted with have feelings for him even though the evidence is right in front of him. That being said, he finally subverts this after having sex with Vaccine Woman in chapter 45 and learns about the feelings the other ladies have for him.
• The Dreaded: Saitama quickly becomes this to whoever monsters who see his strength. It's bad enough (for said monsters) that they tend to abandon their hatred for humanity in favor of survival.
• Decomposite Character: Ki splits into Ki, Nori, Kogane, and Midori after she chugs a bunch of plant fertilizer from different brands on Vaccine Woman's advice to regrow her hair
• Embarrassing Nickname: Roly Poly Vore Girl for Vaccine Girl thanks to the Balloon Belly she had from eating a pollution monster.
• Even Evil Has Standards: Deep Sea Queen may have been a conqueror out to subjugate the surface world before her defeat and Heel–Face Turn, but even she wasn't happy about Puri-Puri Prisoner's tendency to basically rape any attractive man who catches his eye.
  Puri-Puri Prisoner: Prisoner #4188. The name's Sonic, right? (...) You surprised I know? I check up on all the boys who catch my eye. I'm serving a life sentence because I can't seem to control myself. I see a beautiful man, and I take him.
  Deep Sea Queen: Wow. Even in my kingdom, that's a punishable offense.
• Exact Words: Ki tells Eyesight that the reason why she and her sisters don't have any hatred towards humans is that an even stronger being robbed them of that hate. What she doesn't tell the latter is that it was also replaced with primal, bone-chilling fear, since the being in question is Saitama, who can easily kill each of them with a single strike.
• Fan Disservice: Sonic views Puri-Puri Prisoner's Angel Style with abject disgust when the Class-S hero unleashes it against Deep Sea Queen. Given how Triple P is essentially a nude and grotesquely muscular man in this state, his reaction is quite understandable.
  Sonic: He's naked! And he's no angel. Nor is he human! Nor do I wanna watch. I'm out!
• Gender Flip: LOTS of it. Just to name a few:
  • Vaccine Man and Beast King are among the monsters that get genderbent in this story.
  • Zombieman is genderbent into Zombiewoman, and same applies for Boros and Geryuganshoop.
  • Interestingly, Deep Sea Queen subverts this by being the Deep Sea King's sister rather than a genderbent version of DSK.
• Harem Genre: As if the title wasn't enough of an indication. Current list as follows: Vaccine Woman, Subterranean Queen, Beast Queen, Mosquito Girl, Ki, Deep Sea Queen, Tatsumaki, Fubuki, Captain Mizuki, Lin Lin, Tank-Top Girl, Jet Nice Girl, Newtina, Zombiewoman.
• Head-Turning Beauty: Nori herself is quite attractive, to the point that a few women ogle her during her date with Saitama in chapter 38.
• Intimidation Demonstration: Saitama proves to Tank Top Girl and Jet Nice Girl why he's not to be messed with by acing the retraux Heroes Association physical test they put him through and scaring the hell out of Tank Top Girl with his Death Punch.
• Laser-Guided Karma: Do-S receives a butt-lashing from Ki for brainwashing Captain Mizuku after the latter breaks her out of the former's mind control.
• Mass "Oh, Crap!":
  • Deep Sea Queen, Tank Top Girl, and Jet Nice Girl all react to Tatsumaki showing up with fear, especially since Tatsumaki is not known for negotiating with anyone, least of all monsters.
  • On a more comical note, Maiko Plasma's group end up fleeing in terror when King shows up thanks to his (false) reputation as the World's Strongest Man.
• Mistaken for Badass: Poor King is still on the receiving end of this trope, as shown when Maiko Plasma's group flees in terror after they catch wind of his presence.
• Monstrous Cannibalism:
  • Vaccine Woman's primary tactic for defeating monsters made of pollution is to simply devour them whole and digest them — initially, this was an accident that kept on repeating itself until eventually she just decided to run with it.
  • Great Food Tub suffers from an irresistible compulsion to eat everything around her, which leaves her a sad and lonely monster who just can't stop herself from consuming others when she's not stuffed with insane amounts of food.
• My Greatest Failure: Subterranean Queen still feels guilty over her inability to protect her people from being wiped out by the Monster Association.
• Named by the Adaptation: The unnamed female monster in chapter 97 of One-Punch Man is named Newtina, though it turns out to be an alias for her real name Raptora.
• Naughty Tentacles: Considering the Kombu sisters like to molest girls with their hair, said hairs inevitably qualify even though they're technically not tentacles.
• No-Respect Guy: Maiko Plasma tells Ki and her sisters that all the other Monster Association members bully her on a regular basis since she's only a Tiger-level threat despite her electrokinetic powers.
• Oh, Crap!: When Saitama moves to smack Bang on the head after he finally wins a round of rock-paper-scissors with the old martial arts master, Bang realizes that Saitama can easily kill him on accident and dodges out of the way.
• Pragmatic Villainy: Deep Sea Queen deposed her brother after he announced his plans to eradicate humanity since that would have deprived the Sea Folk of a perfectly usable workforce after they took over the surface.
• Screw This, I'm Outta Here:
  • Eyesight and Super Mouse decide that it would be best to go AWOL from the Monster Association with their comrades at the first chance they get after Gyoro Gyoro threatens to execute them for their failure to capture Saitama.
  • Boros and Geryuganshoop plan to leave the Monster Association as soon as they can, both because they only joined to lay low while Boros healed from her injuries and because both aliens know that the Monster Association stands no chance against Saitama's overwhelming strength.
• She's All Grown Up: Vaccine Girl becomes Vaccine Woman again after eating a lot of pollutants while spending time with Saitama.
• Sneeze Cut: Saitama sneezes when Nori gleefully tells Do-S that she could introduce her to "a being we know is so terrifying, they'd make any monster run to the heroes for help" while torturing Do-S for attacking Midori.
• Spared by the Adaptation:
  • Vaccine Woman is reduced to a little girl instead of being disintegrated outright like her canon counterpart was.
  • Beast Queen and Mosquito Girl aren't killed by Saitama and end up joining the harem.
  • Deep Sea Queen survives getting punched by Saitama after a corpse disposal worker spills his drink on her corpse, kickstarting her Healing Factor and reviving her in an instant.
  • Boros and Geryuganshoop survive and join the Monster Association, though it's mostly to avoid detection by the Hero Association while Boros heals.
• Their First Time: Saitama and Vaccine Woman have sex for the first time in chapter 45.
• Tranquil Fury: It's hard to piss off Saitama, but when he's pushed past his limit, he'll make sure you understand just how angry he is without even raising his voice or changing his facial expression.
• Underestimating Badassery: As per canon, Saitama is on the receiving end of this due to his unassuming appearance. Like us audience members, the ones who already know his strength always have a field day watching everyone else react to his absurdity.
• Villain Takes an Interest:
  • The Blizzard Group, Tank Top Army, Monster Association, and Death Gatling's group of heroes converge upon City Z to see what Saitama's really like in chapter 25 thanks to all the crazy events that have happened there.
  • Psykos has began to take notice of Saitama's actions in chapter 43 after seeing Nyan break down whimpering with Tears of Fear coming from her eyes.
• What the Hell, Hero?:
  • Saitama and his companions lay into Genos for being a massive asshole towards the monsters living with them after he attempts to kill Kogane for telling Nyan where Saitama lives even though she did it to protect her sisters.
  • Dr. Kuseno also takes time to call Genos out for letting his desire for revenge against the cyborg who destroyed his home consume him and points out that his hostility towards the monsters living with Saitama stems from his selfish desire to have Saitama dedicate all his time and energy into training him.