Another idea is an OC who is a patient with a very rare and mysterious illness. Chase becomes obsessed with finding a cure for this patient, and along the way, he and the OC develop a deep bond. This could involve the OC having a unique backstory that ties into the mystery of their illness, like they were exposed to something unusual in their past.
One idea could be to create an OC who is a new medical intern at the hospital where Chase works. They could start off with a rocky relationship, constantly butting heads over medical diagnoses, but gradually grow to respect and even like each other. For example, the OC might have a more unorthodox approach to medicine that Chase initially scoffs at.
One common theme is his growth as a doctor. Writers often explore how he hones his skills and gains more confidence in his medical abilities.
Another plot could be that Jackson is chasing a group of shadowy villains who are trying to release an ancient evil. He teams up with some unlikely allies during the chase and they all have to use their unique skills to stop the villains.
Perhaps a plot where they decide to take a break from their acting careers and travel the world together. They could explore different cultures, meet new people, and have adventures that strengthen their relationship. Or they could face a rift in their relationship due to a misunderstanding, and the story could be about how they work through it and come out stronger.
Well, focus on character development. Make your OC have distinct personality traits. For instance, if your OC is confident, show it in how they interact with Chase and other characters, like not being intimidated by his medical expertise. Also, create a unique plot. Don't just go for the typical love - story - in - the - hospital plot. Maybe your OC is involved in a medical mystery that has implications far beyond the hospital walls.
One idea could be creating an OC who has a unique power related to time manipulation. They could be from a different dimension and end up in the Avengers' world. Another idea is an OC who is a master of ancient magic and teams up with Doctor Strange within the Avengers group. Maybe an OC that is a super - intelligent android created by a villain but has a change of heart and joins the Avengers.
You could create an OC for your Persona OC fanfiction who is an artist. This artist OC could use their art as a way to understand and even manipulate the Metaverse. For example, they might draw scenes from the Metaverse that give clues about upcoming events or hidden locations. Their art could also be a form of therapy for other characters who are struggling with their dual lives in the real world and the Metaverse.
Perhaps an OC who is a half - human, half - beast creature. This OC could struggle with acceptance in both the human and beast - kin societies. They end up meeting the main characters during their adventures and learn to embrace their unique identity with the help of the group, while also adding their own combat skills, which are a blend of human strategy and beast - like strength, to the team.
One idea could be to explore the Riddler's origin story from the perspective of your original character (OC). Maybe your OC is a detective trying to solve the mystery of the Riddler's first crime spree. Another idea is to have your OC be a sidekick of the Riddler, either willingly or by being forced into it. They could then have a complex relationship where the OC tries to influence the Riddler's actions for better or worse.
One idea could be an OC who is a brilliant scientist in the Fallout world. They could be working on a secret project to reverse the effects of radiation. Another idea is an OC who is a wandering trader, having all kinds of adventures while traveling from one settlement to another, facing raiders and mutants along the way. And a third idea could be an OC that is part of a new faction trying to bring peace and order to the wasteland.
You could also create an OC human who discovers a hidden talent for communicating with trolls through music. In the fanfiction, this character could use their musical ability to bridge the gap between the two worlds, maybe even creating a new form of harmony between trolls and humans that was previously unthinkable.