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.
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.
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 idea is a wolf oc that discovers a hidden magic within the forest. This magic gives it the power to transform into a human - like form at will. The wolf oc then has to navigate between the wolf world and the human world, trying to keep its secret while also using its new form to help its pack in ways it couldn't before, like getting medicine from a human village to heal a sick pup.
One idea could be an OC werebear who is trying to hide their identity in the Teen Wolf universe while also dealing with the normal high school drama. For example, they might be worried about accidentally shifting during a big event like a school dance or a sports game.
Perhaps the fanfiction explores different meeting scenarios that were not shown in the original movie. It could show the first meetings of the main characters in a different context, like instead of Judy meeting Nick at the ice cream parlor, they meet during a big city - wide event where there's chaos and they have to rely on each other from the start. This would change the dynamic of their relationship development.
Some dark zootopia fanfiction might also focus on the psychological toll of living in a society that seems so perfect on the surface but has hidden problems. Characters could struggle with depression or anxiety, like Judy Hopps realizing that her dream job isn't all she thought it would be and having to deal with the corruption and darkness she discovers within the Zootopia Police Department.
A great Zootopia crossover fanfiction idea is with the world of Avatar. The animals could visit Pandora and interact with the Na'vi. The Na'vi might be fascinated by the talking animals from Zootopia. Or a crossover with the Incredibles. The super - powered family could team up with Judy and Nick to solve a crime in Zootopia that involves some super - villainous animal. Also, a crossover with Toy Story where the Zootopia toys come to life and have their own adventures within the city would be really fun.
A human journalist could visit Zootopia to write a story about the city. But during their stay, they uncover a conspiracy that threatens the harmony between the different species. The journalist then teams up with a fox like Nick Wilde to expose the truth. This would be a great way to explore the politics and social structure of Zootopia from a human's perspective.
One idea could be an OC who is a new Fable arriving in Fabletown. They have a mysterious past that is somehow connected to the main events in the game. For example, an OC who was a former ally of Bigby's in an old war but lost their memory. This could lead to a lot of drama as they start to remember bits and pieces and it affects their relationship with the other characters.
A great plot could be that the wolf OC discovers a hidden valley that is untouched by the ice age's worst effects. However, there is a threat lurking in the valley, like a prehistoric monster. The wolf has to decide whether to keep this discovery a secret to protect its pack or seek help from other animals to defeat the threat.