Here are some plot ideas. The Dragon OC could be a reincarnation of an ancient and powerful dragon. It gradually remembers its past life and powers as it interacts with the characters in One Punch Man. It might start as a weak - looking creature but as it unlocks its memories, it becomes extremely powerful. Another plot could involve the Dragon OC being hunted by a secret organization in the One Punch Man world because of its unique dragon DNA. This organization wants to use its DNA to create super - soldiers, and the Dragon OC has to fight back and expose this evil plan.
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 idea could be a male OC who has the power of telekinesis. He could be a former scientist who was exposed to some strange radiation during an experiment. This power would set him apart from the existing characters in One Punch Man. He might initially struggle with controlling his power, leading to some comical or dangerous situations.
You could create an OC who is a gamer in the One Punch Man universe by giving them a special power related to video games. For example, they might be able to use 'power - ups' from games in real - life battles, like a speed boost or invincibility for a short time. Their backstory could be that they were a normal gamer who got sucked into the One Punch Man world and had to adapt their gaming skills to survive.
Well, a plot could be about an OC who is a healer. In the world of One Punch Man, where destruction is common, Tatsumaki might initially be dismissive of this healer OC. But as they face tougher enemies, Tatsumaki gets injured and realizes the value of the OC's power. It could be a story of her learning to work with someone whose power seems so different from her own. Another could be an OC who is a time - traveler. The OC comes to Tatsumaki's time to prevent a future disaster that involves her. Tatsumaki, being the proud and powerful character she is, is skeptical at first but gradually realizes the truth of the OC's claims. And for a third plot, an OC who can communicate with monsters. This OC tries to broker peace between Tatsumaki and the monsters, which Tatsumaki finds absurd at first but then starts to consider as the situation unfolds.
To create a Dragon OC in One Punch Man fanfiction, start with appearance. A dragon OC might have scales that change color depending on mood. Then, for the powers, it could have super strength combined with the ability to fly at supersonic speeds. Also, in terms of relationships, it could start as an enemy of Saitama but later become an ally.
A good plot idea could be that the OC Dragon God has to hide their true identity in the high school. They are there to find a certain magical item that is hidden in the school. As they search, they get involved with the main characters and have to deal with the normal high school drama as well as the supernatural threats that come their way.
A plot could involve a villain in the DoS (Darkness or Shadow) realm who has the ability to nullify Saitama's strength for short periods. This villain is causing chaos in the city, and Saitama has to figure out how to defeat him without relying solely on his brute force. Maybe he teams up with other heroes who have skills in detecting and countering such abilities.
For a One Punch Man Monster OC in fanfiction, consider its weaknesses. Even though it's a monster, it can't be all - powerful. Maybe it has a fear of bright lights, so heroes could use that against it. Its personality could be really cocky because of its unique powers, but that could also be its downfall. It might underestimate its opponents and get beaten as a result.
Start with a relatable situation for the gamer OC, like being new to the One Punch Man world and having to figure out the rules. Then, introduce a conflict such as a powerful villain that the OC's gaming skills are uniquely suited to defeat. Throw in some twists, like the villain also having some knowledge of gaming mechanics and using it against the OC.
Well, to create a dragon demon OC in One Punch Man fanfiction, start with the appearance. You could give it scaly skin with a color that stands out, like purple or deep blue. Its eyes could glow in the dark. For the powers, it could have super strength and the ability to fly at high speeds. And don't forget about its motivation. It could be seeking revenge on those who wronged it in the past.