Well, you could focus on a superhero oc that is an outcast in the superhero community because their power is considered too dangerous or uncontrollable, like the power to create black holes on a small scale. But they learn to master it and prove their worth. Or, make a story about a young superhero oc who inherits their powers from a long - lost relative who was a great hero in the past and has to live up to that legacy.
A great concept for superhero oc fanfiction is a hero who has the power of empathy. They can sense the emotions of others and use that to either calm down villains or boost the morale of their fellow superheroes. Also, you could write about a superhero oc from another dimension who comes to our world with powers that are completely alien to our understanding, like the ability to turn into a living energy form.
Here are some ideas. A group of students from the superhero academy could be stranded on a strange planet during a field trip. They have to use their powers in new and creative ways to survive and find a way back home. Or perhaps there's a prophecy about a'special one' among the students who will bring either great glory or destruction to the academy. This leads to a lot of tension and mystery as everyone tries to figure out who it could be.
Well, you could write a fanfic where Ladybug and Chat Noir get transported to an alternate universe. In this universe, their roles are reversed, and they have to figure out how to get back to their own world while dealing with the differences. Also, a plot could revolve around a Miraculous that has been lost for centuries suddenly resurfacing, and all the chaos and mystery that comes with it. Maybe a story about Ladybug having to deal with a personal crisis that affects her superhero duties, like losing her confidence after a major defeat.
One idea could be creating an OC that is a hybrid of two different Pokemon types. For example, a half - water, half - electric type with unique abilities. Another idea is to make an OC that has a special bond with a legendary Pokemon, perhaps they are the chosen one to help the legendary in a time of crisis. Also, you could have an OC from a different region with a completely new set of Pokemon not seen before in the main series.
One idea could be to create an oc that represents a small, newly independent nation. Show their struggles and triumphs as they find their place in the world of the countryhumans. Another idea is to make an oc that is a hybrid of two existing countries, with a unique culture and set of values. For example, an oc that is half - France and half - Italy, and how they interact with the other countryhumans.
You could also create an OC who is a spy sent to infiltrate the Darkling's inner circle. The OC has to balance their mission with their growing feelings for the Darkling, which makes for a complex and engaging story.
Well, you could have an OC that is a skilled hacker who gets involved with the Phantom Thieves by accident. They might have a Persona that represents a famous code - breaker from history. Also, an OC who is a foreign exchange student from a country with a very different cultural background could bring in new elements to the fanfiction. Their Persona could be influenced by their home country's folklore. Maybe an OC who is a prodigy artist and uses their art skills to create powerful items in the Metaverse, with a Persona related to a great artist from the past.
One idea could be a Garou OC who is a lone wolf, not part of any pack, and has to survive in a world full of both human and supernatural threats. They could have unique powers like the ability to blend into shadows, which helps them in their solitary existence.
One idea could be to explore Imhotep's life before he became the mummy. Maybe he was a brilliant architect with a secret love interest that influenced his actions later. Another could be a story where an OC helps Imhotep break free from his curse in a different way than in the movies. For example, the OC has a special magical ability that can nullify the dark magic binding him.
Well, you could write a fanfiction about a Marvel OC who is from an alternate dimension where the roles of heroes and villains are reversed. This OC comes to the main Marvel universe to try and right the wrongs in their own dimension. Or perhaps an OC who is a young Asgardian with a gift for magic that Odin tries to keep hidden for some reason, and the OC has to navigate the politics of Asgard while also dealing with their emerging powers.
One idea could be an OC who is a spy sent to infiltrate Doflamingo's organization. This OC could have a hidden past that slowly gets revealed as they gain Doflamingo's trust. Another idea is an OC with a special power that Doflamingo wants to control or use for his own evil plans. For example, the OC might be able to manipulate time in a small area, which could be a great asset in battles or heists.