You could write about an OC who is a detective from a different district outside of Zootopia. They come to Zootopia to solve a mystery that links back to their home district, which involves some long - lost secrets and political intrigue within the city.
One idea could be creating an OC that is a hybrid animal, like a fox - rabbit mix, and exploring how they fit into Zootopia's society. They might face unique challenges and prejudices.
Another interesting concept is an OC that is a street artist in Zootopia. This character could use their art to bring different species together, or perhaps their art is a form of protest against some of the underlying prejudices in the city. They could interact with the known characters like Judy Hopps and Nick Wilde, adding a new dimension to the story.
Maybe a wolf OC who is a teacher in Zootopia. This wolf could teach self - defense classes to smaller animals, but has to deal with the fear and prejudice some of the students' parents have. It could be about how the wolf overcomes these obstacles and builds trust within the community.
One idea could be exploring the backstory of a minor character from Zootopia. For example, the street vendor who sells those delicious looking treats. Maybe he has a secret past that ties into a bigger mystery in Zootopia. Another idea is to create a new adventure for Judy and Nick. They could be called to solve a case in a different part of Zootopia, like the underwater section where the otters and other aquatic animals live. A third idea would be to focus on the relationship between different animal species in Zootopia during a festival. How do they interact? What challenges and joys come with it?
An interesting MCU OC fanfic idea could be an OC who is a journalist. They are always on the hunt for the next big story about the superheroes. This could lead them into all sorts of dangerous situations as they try to get exclusive interviews or expose secrets. Another could be an OC who is a mutant in the MCU (even though mutants are not as prominent yet). This OC would have to deal with being different and feared, while also trying to use their powers for good. And a third idea is an OC who is a reformed villain. They were once on the wrong side but now want to make amends and help the heroes in their fight.
A Sonic OC fanfic could center around an OC who is a healer. In a world full of battles against Dr. Eggman, this OC would use their healing powers to patch up Sonic and the gang after tough fights. They could also have a backstory about how they learned their healing abilities, maybe from an ancient and forgotten tribe in the Sonic world. This would add depth to the character and the fanfic as a whole.
You could write an OC fanfic where the OC is a female assassin. She has a rivalry with Agent 47 at first, thinking he is taking all the good contracts. But as the story progresses, they end up having to team up to take down a powerful criminal organization that is targeting assassins. Her special skill could be hacking into high - security systems to gain access to targets.
A Hiccup OC fanfic could also explore what would happen if Hiccup's OC was from a different tribe. They could have different traditions and skills, and the story could focus on how Hiccup and his friends learn from this new character. For example, the OC could teach them a unique way of dragon training that they've never seen before.
Another interesting concept is a Kryptonian OC who is part of a secret society on Earth. They keep their identity hidden from the world, but within this society, they use their powers to maintain order and justice in a more shadowy way. They might have to deal with internal power struggles within the society as well as external threats to their secrecy.
You could have an OC who is a shy artist fairy. In the fanfic, Tinkerbell discovers the OC's amazing talent for painting the most beautiful landscapes of Neverland. They then team up to create a huge mural in Pixie Hollow that showcases all the different areas of their magical world. The OC might start off really timid but gain confidence with Tinkerbell's encouragement.
One idea could be an OC who has the power of music in the Precure world. She could use melodies to heal or empower others. Another idea is an OC from a different dimension who comes to the Precure world with unique powers and has to learn how to fit in and fight alongside the Precure. Maybe an OC that is half - human, half - magical creature and has to hide her true identity while being a Precure.