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One punch man X My Hero academia Crossover:The rat from the sewer. by Someone_Chill
Fandoms: ワンパンマン | One-Punch Man, 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
25 Oct 2025
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This is just a work im doing for the fun of it and also to practice a bit on my english and writting skills.
It's my first work in a couple of years, so please tell me if you think i could've done something better or got something wrong with the grammar.Well, to make a small summary
Both worlds after a cosmic distortion event merged together, this event caused the number 1 S-class hero, Blast, to go back into action in his own world. Feeling this isnt just a massive cosmic coincidence.While at the pther side of the ocean, the goverments are in utter shock, after a whole pangea continent popped into their world, stealing the attention from Japan's situation. With no one knowing how to approach the other unknown invaders, while Saitama asks himself what happened to Z-City ghost town, since the whole place was gone along with his free rent house.
The time when both events happens settled in;
My Hero Academia:The finale of the Deku Dark Vigilante arc.
One punch Man:After the fight with Elder centipide. -
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Kitsune who lived in a Dojo with her adopted Father and learns to be different even if people are afraid of monsters. She wants to help and learn to love.
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"Thank you both... for inspiring me!"
Tsuyokaze (Male OC.) is a weakling esper who sought to utilise his rare psychokinesis powers to aid the innocent masses! Unfortunately he barely managed to rise the ranks, mostly done via throwing himself into life threatening situations, fending against weak monsters and rescuing the civilians he's able to...
If not for his shining heroic idols, Fubuki and even more, Tatsumaki, he'd have given up his dream of being a hero long ago, but after hard work and determination, he's just made it into the hero rankings of B Class!
When his place in the world finally becomes acknowledged by someone greater than himself, perhaps by even one of his idols, just what will be in store for the weak hero?
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In the near future, Saitama and Tatsumaki must get married to save the universe. Their life together as a married couple is one of convenience. Tatsumaki hates being touched, and Saitama isn’t interested in intimacy either. How are these two supposed to save the world when their marriage is the key?
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He thought being reincarnated in OPM meant that he had everything figured out. Unfortunately reality is stranger than fiction and being reincarnated decades before canon did not mean it was smooth sailing. From the start the world was throwing surprises at him and even after living in it for all these years it still had a few more for him.
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In this alternate universe, Saitama trains so much that he ended up transforming into a monster and now the heroes won't leave him alone. Saitama, now a lonely and depressed monster, will meet new and strange friends who will accompany him along the way as he tries to continue his hero hobby.
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En este universo alternativo; Saitama ha entrenado tanto que terminó transformándose en un monstruo y ahora los héroes no lo dejarán en paz. Saitama, es ahora un monstruo solitario y deprimido pero conocerá nuevos y extraños amigos que lo acompañarán a lo largo del camino mientras intenta continuar con su pasatiempo de héroe.
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Isekai'd to OPM , waking up in the unknown body. Don't want to change the timeline and as I want to become a background character. But luck isn't on my side now as I am middle of the hero-monster drama.
You may read this on Wattpad (same username, same name story)
(Pls read the notes) -
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After Saitama punches Garou out of his cosmic fear mode, time gets messed up and Garou ends up turning into a child.
With the body of three year old, but the brain of his 18 year old self, Garou needs to navigate this new situation.
The worst part? The S-class heroes are gonna look after him.
...Great.
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We all know the story about the story of our favourite bald-headed hero who became so strong that he was able to kill off/knock out his opponents with a single punch. But what if the protagonist of the One Punch Man world was instead a young woman who has a preference for women? If such a scenario interests you, then feel free to read the story of the One Punch Babe!
I have officially abandoned this fanfiction because I have lost my inspiration to write this story. Thank you to all the readers that have read this work. I really appreciate the fact that you have been reading this fanfiction. Peace out!
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A week before the events of the first episode, Saitama is walking home after a trip to the grocery store, but finds himself in a theater room with people he didn't know. Only to be told they would be watching the future. Well... at least there is free food.
Originally on FF
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When a strange monster came across the city and sirens sound as the heroes wonder where the monster went. But then the S Class heroes goes to investigate to find a girl but when in a care of the one of the hero. They discover she has a power of a huge monster and wants to learn how to live with the humans.
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Reader is a psychic and lives with Saitama and Genos in Z city. But when she joined the Hero Association she makes friends and falls in love with one of the heroes in S Class.
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One day, a regular civilian woman was caught up in a huge mess.
The huge mess being the absolute and total destruction of City A. She had tried to help the heroes where they needed, using her experience as a nurse to treat the less injured civilians caught up in the attack. While she was out searching for others who needed assistance, she stumbled upon a half-dead alien.
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"Dad always did say my bleeding heart would get me in trouble some day.. But, Mom always told me it was a strength, right? Maybe I can make this work..?"
(Spoiler alert: She makes it work. A bit too well, honestly.)
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The reader was a prisoner to the monsters but heroes came to save them, but they are broken inside and he could teach you everything you could be yourself again and maybe he could teach you how to love again.
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Saitama decided to take a vacation and stay away for a month, without doing his hero activities, thus leaving Genos in his place... What could go wrong?
Follow this story where a month-long vacation ends up becoming just 7 days separated into 7 chapters
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Garou has spent three years of torture in the monster's kingdom. Then he escapes.
Will he be able to stay free is the real question.
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(Previously titled Gym Enemies to Gym Bros) Saitama's job has been getting stressful, so he now has to start working out at night. This is probably the worst decision Saitama has ever fucking made.
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I got reincarnated in the world of One Punch Man by InstaMoist
Fandoms: ワンパンマン | One-Punch Man
25 Oct 2023
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Another alternate universe, but this time Kaiser reincarnated into the world of One Punch Man, and for years he has had to be low-key in this world full of monsters and heroes with unreasonable powers. However, he still tries to find his purpose in life while being pressured by a strange system that exists within him.
Warning: The story is exceedingly dark and contains explicit mature and gore scenes.
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"You guys are still calling yourselves the 'Four Heavenly Kings?' I thought that was just a phase you guys were going through. Anyway, it looks like you've been quite busy since we last met. I'm not sure if I'm going to be a lot of help in searching for this 'God' dude, but it wouldn't hurt to try. Genos, let's go register in the Hero Association with them. I'm sure we'll even be able to find that mad cyborg you've been rambling on about. Do this and I'll officially make you my disciple!"
Genos had barely met the queer-looking quartet, who seemed to be good acquaintances with his new master, but surely this was nothing but a fated meeting.
Ignoring the excited look on the Four Heavenly Kings' brand new disciple, the blonde cyborg opened his mouth to give his response that would undeniably change the course of his life.
"Yes, Sensei!"