What are some interesting plot ideas in One Punch Man Z - class fanfiction?

Another plot could be that an S - Class hero loses their powers. They then have to start from scratch and learn what it's like to be a normal person. Along the way, they discover new aspects of themselves and the world around them. This could lead to them developing a different kind of strength, not just physical but also emotional and mental, which in turn could help them regain their powers in a more evolved way.

One idea could be that Saitama enrolls in the school from 'Class'. He'd be this super powerful student that no one really understands at first. His nonchalant attitude towards the school's challenges would be really funny.

One idea could be a crossover where Saitama from One Punch Man ends up in the Dragon Ball Z universe. He might be intrigued by the different power levels and the concept of ki. He could enter a martial arts tournament there and easily defeat most opponents until he faces someone like Goku at his Super Saiyan Blue level. Then it would be a battle of different power concepts.

There's 'Sneaky Swordsman', a Z - class hero in One Punch Man Z - class fanfiction. He doesn't have the most powerful sword skills, but he is very sneaky and can use his environment to his advantage when fighting monsters. And then there's 'Patchwork Puppet', a hero who has a body made up of various parts and can disassemble and reassemble himself to surprise his opponents. These characters stand out because of their unique abilities and the ways they deal with the challenges in the world of One Punch Man.

One plot could be Tornado having to team up with a new, unexpected hero to face a powerful villain that even she has trouble with. This would show a different side of her as she has to work with someone she might not initially get along with.

One idea could be that Saitama from One Punch Man somehow ends up in the world of Overlord. He might be mistaken for a powerful player at first. Since he's so strong, he could easily defeat many of the powerful monsters in the Overlord world, which would cause a stir among the various guilds and NPCs. Another plot could involve the characters from Overlord trying to understand Saitama's power, which is beyond their comprehension as it's not based on magic or typical RPG stats.

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.

One idea could be Issei getting transported to the One Punch Man universe and trying to prove his worth among the powerful heroes there. He might start by challenging some of the lower - ranked heroes and learning the ropes of this new world.

Another plot could involve Sii being a civilian who accidentally gets caught in the middle of a fight between Saitama and a villain. Sii then discovers they have a latent psychic ability that they use to help Saitama in the fight, and this leads to Sii becoming an apprentice of sorts to Saitama, learning about being a hero.

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.