What are some interesting ideas in One Punch Man Si Fanfiction?

In a One Punch Man fanfiction, a great plot could be the origin story of some of the minor heroes. For example, how Mumen Rider got his bike and started his hero journey. Another plot could be a tournament among the heroes to see who is the most skilled (not the strongest since that's Saitama). And a story where Saitama has to deal with a PR disaster for the Hero Association because of his non - traditional hero behavior.

A great fanfiction idea could involve the ninjas of Naruto trying to figure out how Saitama got his incredible strength. They might study him in the hopes of creating their own super - soldiers. Another idea is a time - travel fanfic where Saitama goes back in time to the founding of the ninja villages in Naruto. And there could be a story where the One Punch Man characters get chakra and start using ninja techniques in their own battles.

One idea could be that Ben Tennyson gets the power of One Punch Man. He then has to deal with his normal alien - fighting foes but with this new overpowered ability. It would be funny to see how he adjusts to being able to defeat enemies with just one punch while still trying to use his Omnitrix in creative ways.

A cool concept for a RWBY and One Punch Man fanfiction would be a crossover tournament. Characters from both universes are invited to participate in a fighting tournament. Blake could use her speed and agility to surprise some of the One Punch Man characters, while characters like Mumen Rider could show their unwavering spirit in the face of the RWBY combatants. Also, Yang's powerful punches could be compared to Saitama's, and there could be a friendly rivalry between them over who has the stronger punch. This would lead to some interesting interactions and battles within the fanfiction.

One idea could be a yandere Genos who becomes overly possessive of Saitama. He might start interfering in Saitama's daily life, like trying to keep other heroes away from him under the guise of protecting Saitama's secret strength. Another idea is a yandere villain who falls in love with Saitama after being defeated by him and then starts stalking him, determined to make Saitama hers.

How about a crossover with 'Attack on Titan'? Saitama could find himself in the world of the Titans. His ability to defeat any enemy with one punch would be extremely useful against the Titans. He might not understand the complex politics and fear that surrounds the people in that world at first. But as he starts taking down Titans left and right, he would become a sort of legend among the survivors.

One idea could be exploring the backstory of Saitama before he became so powerful. Maybe he had a difficult training regime that involved some unique challenges. Another idea is to write a fanfiction where Genos and Saitama have to face an enemy that can nullify Saitama's power, forcing them to rely on strategy and Genos' upgrades more than ever. Also, a fanfiction about the other heroes in the One Punch Man universe forming a team without Saitama and having to deal with a powerful threat on their own could be really interesting.

One idea could be that Saitama from One Punch Man ends up in the Undertale universe. He might accidentally punch some of the monsters there, thinking they are threats like the monsters in his own world. But then he realizes that in the Undertale world, things are more complex, and not all monsters are purely bad. Another idea is a crossover where Frisk from Undertale somehow gains Saitama's power and has to navigate their own world with this newfound strength, changing the way they interact with both monsters and other characters.

One idea could be exploring Garou's past more in - depth. Maybe show his childhood and what led him to become the way he is. Another could be a story where Garou has to team up with Saitama for some strange reason, like an even more powerful enemy emerging. Or perhaps a fanfiction where Garou tries to train under Saitama to become stronger in a different way than his usual self - taught methods.

A plot could involve a villain who has the power to control hair and targets Saitama because his hair is so unique. This leads to a battle where Saitama has to figure out how to fight without using his hair as a weapon, which is quite difficult since his every move usually involves his head (and thus his hair) in some way.