There are also fanfictions where the OC is an alien. This alien OC comes to Earth and is initially confused by the concept of heroes and villains as they have a different social structure in their home planet. Their interactions with the existing One Punch Man characters, like Genos or King, can lead to some really humorous and thought - provoking scenarios.
One interesting story could be about an OC with a unique power that they struggle to control at first. For example, an OC who can manipulate time in small increments but accidentally freezes themselves often. Another might be an OC who is a hero trying to prove themselves in a world dominated by Saitama's overpowering strength.
Another concept might be an OC that has a strange origin story. Maybe they come from a far - off planet where the laws of physics are different, and they have to adapt to Earth's environment while also dealing with the various threats in the One Punch Man world. This could lead to some really cool character development and interactions with other characters.
You can start by looking on popular fanfiction websites such as Archive of Our Own (AO3) or FanFiction.net. Just type in 'One Punch Man OC' in the search bar and browse through the results. Check the ratings and reviews of the stories to get an idea of their quality.
A possible plot is that the OC is a former enemy of Fubuki who has seen the error of their ways. They try to make amends by helping Fubuki in her quest to become stronger and more respected in the hero community. This could involve training sessions where the OC shares some unorthodox fighting techniques that complement Fubuki's psychic powers. The OC could also have connections to some powerful and mysterious figures in the One Punch Man universe, which could open up new storylines for Fubuki.
One interesting 'One Punch Man Reaction Fanfiction' could be where other heroes react to Saitama's true strength. For example, they might initially be skeptical of his claims but then are completely astonished when they see him defeat a powerful monster with just one punch. It's a fun exploration of how the other characters in the 'One Punch Man' universe perceive Saitama's overpowered nature.
There could be a fanfiction where Genos falls in love with a new female hero in the One Punch Man world. This new hero might be a support type, and Genos is initially confused by his new feelings. He tries to balance his admiration for Saitama and his growing love for this new girl, which leads to some really cute and awkward situations.
One interesting 'One Punch Man DC Fanfiction' could be a crossover where Saitama meets Superman. They might have a friendly sparring match that ends up with Saitama's nonchalant punches and Superman's super strength creating some hilarious and unexpected situations. Another could be where Genos teams up with Cyborg to fight a common enemy. Their different robotic enhancements and combat styles would make for an exciting story.
There might be a fanfiction where the villains from One Punch Man invade the world of Haikyuu. The volleyball players then have to use their teamwork and athletic skills in a new way to defend their world. Maybe Bokuto could use his powerful spikes to fend off monsters, and Kageyama's precise sets could be used to coordinate attacks against the invaders. It would be a unique take on both universes.
Well, you could write a fanfiction about a new hero who joins the Hero Association and has a unique power that somehow challenges Saitama's world view. For example, a hero who can control time in a very limited way but uses it in the most strategic manner. Or perhaps a story where all the villains team up against the heroes and Saitama has to face an army of powerful foes all at once. It would be interesting to see how he handles that without just one - punching everyone immediately.
There are many interesting fan stories. For example, some fans create stories where Saitama has to face an opponent who can nullify his one - punch power. It adds a new level of challenge to his character.
First, think about unique powers. For example, a power related to manipulating sound waves in a very distinct way, like creating illusions through sound in the One Punch Man universe. Then, consider the character's backstory. Maybe he was an ordinary guy who got caught in an experiment gone wrong, which gave him his powers. Also, his personality should be engaging, like being a bit of a loner but with a strong sense of justice.