One possible plot could be about a new hero in town who idolizes Saitama. This hero follows Saitama around in his daily life, trying to learn his secrets. But all he sees is Saitama doing really ordinary things like playing video games and reading manga, and he has to figure out how these normal activities are related to Saitama's incredible strength.
Well, perhaps a plot where Saitama tries to teach Genos some really mundane daily skills, like grocery shopping but in a super - hero - ish way. For example, he shows Genos how to find the best deals on discounted monster - fighting gear while also picking up some eggs and milk.
A great plot could be centered around the fanfiction exploring the daily life of other heroes in the One Punch Man universe. We could see how they interact with Saitama on a non - hero - saving basis. Maybe they all get together for a barbecue and we get to see their different personalities, their rivalries and friendships, and how Saitama is just this oddball among them who is super - powerful but also really laid - back about everything.
One possible plot could be that a new and extremely powerful villain emerges who is not impressed by Saitama's one - punch ability at first. This villain manipulates the rules of the tournament to his advantage, creating unfair match - ups for the heroes. The heroes then have to find a way to overcome these obstacles while also dealing with their own rivalries and personal growth. For example, Genos could be paired against a much stronger opponent early on, and in the process of trying to defeat this foe, he discovers a new power - up within himself.
Mumen Rider could be an interesting main character choice. His unwavering sense of justice and his determination despite being a relatively weak hero could be the focus. In a daily life fanfiction, we could see how he trains, his interactions with civilians, and how he looks up to heroes like Saitama even though he may not be on the same power level.
The story mainly follows Saitama, a hero who can defeat any opponent with just one punch. It shows his daily life as a hero, his interactions with other heroes, and the various threats that he and his comrades face in a world full of strange and powerful monsters.
One idea could be that Saitama somehow gets transported to the DC universe. He might initially be confused by all the superpowered beings there. Maybe he enters a hero - villain battle in Gotham and just one - punches all the villains, which both amazes and confounds the local heroes like Batman. They start to investigate this strange, bald - headed, extremely powerful man.
One possible plot could be that Saitama somehow ends up in the Dragon Ball Z universe. He meets Goku and they decide to have a friendly sparring match. But when Saitama throws his punches, Goku is shocked at the power, yet also realizes Saitama has no ki. Then they team up to face a new, super - powerful villain that threatens both their worlds.
A plot could involve an experiment gone wrong in the One Punch Man world that creates a rift, pulling in inklings and octolings. Genos and Saitama have to deal with these new, ink - based beings. The inklings mistake Saitama for a super - strong boss - like character and try to challenge him. Saitama, of course, defeats them with one punch, but then realizes they're not really bad. So he teams up with them to stop the real threat, which is a mutated sea creature that has been affected by the same experiment and is now attacking both worlds.
One possible plot could be that Saitama somehow ends up in the Naruto universe. He might be mistaken for a very powerful shinobi at first. Naruto, being Naruto, would probably be curious about Saitama's strength and try to befriend him. They could team up to face a new, extremely powerful enemy that neither universe has seen before, like a super - strong demon that can absorb chakra and is also incredibly durable like the monsters in One Punch Man.
One idea could be a crossover where Saitama ends up in the My Hero Academia universe. He might accidentally enroll in U.A. High School. His overpowered abilities would shock everyone, and he could end up being both a mystery and an inspiration to the students. Another plot could be about Deku getting some training from Saitama. Saitama's unique training methods might give Deku a new perspective on how to use his power.
Maybe a story where the heroes from Boku no Hero Academia are faced with a villain so powerful that they have to seek the help of Saitama. It would be interesting to see how they interact with his nonchalant attitude towards heroics.
Maybe there's a device that accidentally transports the top heroes from both universes together. In this crossover, All Might and Saitama could have a friendly competition to see who can defeat the most villains in a day. However, they quickly realize that their worlds have different threats and they need to work together. For example, Saitama could learn about the concept of 'quirks' and how it affects hero society, while All Might could be amazed by Saitama's pure physical strength.