The world has been incinerated. The last remnants of humanity are on their last legs, unable to fight against those who wish to see them annihilated. To aid them, one man will cross even the boundary between worlds. A Paladin of Justice, a man whose mere presence comforts the masses and silences their cries. He is King, The Strongest Hero.

Saitama and gang's misadventures prior to NEO

Izuka Yagi was neglected and abused by her family and friends for being quirkless, and after finding out the truth of her father quirk she was met by a extremely powerful being that gave her power, now she will take revenge on this cruel society with her monster army that she created, she will be known as Psykos First story

[Jinx (Arcane) x Garou (One Punch Man) crossover] In the depths of the Fissures, Jinx has managed to replicate Piltover's Hextech breakthrough using her stolen gemstone, and Silco's plans for it are already in motion. Unfortunately for him however, a commotion in The Lanes is brewing due to the arrival of a pointy-haired outsider, who seems to have a way of catching Jinx's eye...

As the Prime World Ends, another parallel tale takes its first steps. Welcome to a world where Izuku has two older sisters, Tatsumaki and Fubuki. But that's not all that has changed in this world. Strange new things lurk in the shadows, stars and across the ocean. Can Izuku once again become one of the greatest heroes, just like his older sisters?

Saitama wanted to have a quiet day. Genos just showed up with what looks like a universal portal. How would he know that by even touching the portal he would be teleported? Now he's lost in a destroyed city... Oh yeah, there's also a girl with fox ears and a floating eye. Apparently she wants to beat him up.

Après une cuisante et violente défaite qui la laisse aux portes de la mort, Tatsumaki doit prendre le temps de guérir, tant physiquement que psychologiquement. Mais entre les traumas du passé et ceux du présent, la Tornade Tragique devra faire face à sa pire ennemie : elle-même, et accepter sa propre vulnérabilité.

This Fanfic idea comes from a dream I had. The best Summary I have is, Ryuko did Saitama training and chaos to the canon. Ryuko personality is fusion in between Ryuko and Saitama.

The Justice League are happy that the world has now tons of heroes to protect the world, but now bigger threats are coming and danger is at every corner. However, one certain hero gets the champions of Earth by surprise, a bald guy with a cape which might have powers that could rival Superman. Can Saitama and his friends get along with the heroes from the past?

Izuku Midoriya is the younger brother of the famous Psykick Sisters Tatsumaki and Fubuki. Both women have powerful quirks that made them some of the most powerful heroines in all of Japan, while he started out having no quirk. However fate was waiting for him, as he works hard and soon meets up with the Number One Hero All Might, also there is a bald hero who appears from time.

What would have happened if Saitama had gotten into Yggdrasil? And not just in canon, but before the main events. Player discord, developer despair, and the complete destruction of the world. and that's just a small part of it.

There's a new Bat in Gotham... and this one thirsts for blood.

It was supposed to be a normal day. Fifteen-year-old Tatsumaki was walking Fubuki to school like she always does when suddenly a disgusting monster appeared. This thing dared to drag her to a different world. Now, she has to look for a way back home to her sister. The worst part? This white-haired brat told her she had to become his classmate. This boy must be mentally challenged.

A SI Sung Jinwoo arrives in the One Punch Man universe aka What if the Shadow Monarch teamed up with Saitama?

Ranma Saotome, a martial artist for fun, faces crazy rivals, crazy brides, monsters, and a perverted old man, lucky that after years of training he has become the strongest man... and the strongest woman.

After Mew, the Mythical but playful Pokemon, finds a dimensional tear in the Pokemon World, it attempts to seal said tear on its own. The result had not only sealed the tear, but it also dragged Mew to another world void of Pokemon but filled with Monstrous Beings born or made, and Heroes that fight such threats. What does Mew do in such a world? Explore it all, one day at a time.

Coming off the cusp of a disastrous battle at UA, a wish Granted By God Takes Deku along with his classmates away from the world they once knew to someplace new but familiar, possessing heroes themselves but they soon come to realize that operate at a different code of ethics than what they are use to, they will need to brave this new world in hopes of retuning Home.

Stranded in an unknown world, but not alone, Saitama and his friends lived their lives in a strange world. They found happiness and peace, but an old evil returned, birthing new evils and challenges for the next generation. Co-written with i4md347h, the author of The Hunter Amongst Villains. Current Progress: VOL.7: COMPLETED. Now available in AO3 under the pen-name OldWanderer.

Saitama, the hero whose power knows no limits, gets ripped from his world and thrown into a dimension of caped heroes and city-level threats. But his overwhelming strength makes him more concerned with finding discounted instant noodles than saving the day Edit:Chapter 1, rewritten

After a Mysterious-Cube falls from the sky, Class-1A finds themselves transported to a strange alternate-universe, and until they can return home to stop All-For-One and Shigaraki, they must train under the Class-S Heroes of this Other-World, and grow strong enough to win the Final-War that awaits them... (An Alternate Take on Lumpeistbark3's CYA: What Defines A Hero Series)

Two humans seen as Monsters by everyone, one seeks to be loved and seen as a human by everyone and the other seeks to be feared and seen as a Monster by everyone. But despite there differences they both been wearing a mask to hide there true self. In order for them to overcome there obstacles they must both face there true selves.

Naruto Uzumaki, pemuda ceroboh namun penuh semangat, tiba-tiba terlempar ke dunia asing. Ada Entitas misterius yang ingin menguji Naruto dalam dunia penuh pahlawan dan monster. Dengan kemampuan teleportasi sebagai senjata utama, Naruto harus membuktikan dirinya layak bertahan di dunia baru ini.

After conquering a hollow Earth, Boros roams the galaxy, his unmatched growing power breeding only boredom. Years of crushing civilizations leave him longing for a worthy foe. However his search finds him and his forces in the New World, where he finds Ainz Ooal Gown and Nazarick. Will the Sorcerer King and his Guardians be the ones to finally end Boros's eternal boredom?

In a world of Heroes and Villains, where four out of every five People have some sort of Super-Power, Izuku Midoriya is that lonesome fifth person. At a young age, he learned a life lessons that "Not all men were created equal". But as long as he pushes his limits, he will show that human beings are strong because they have the ability to change themselves.

What would happen is Saitama from one punch man accidentally teleport into Percy Jackson universe and have a daughter with the god of the hunt and the moon Artemis