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.
Well, you could have a fanfiction where the magic in Fabletown starts to malfunction. Bigby has to figure out why while also dealing with the chaos it causes. For example, fables' true forms start to randomly appear. Another idea is a love story set within the 'A Wolf Among Us' universe. Maybe a fable falls in love with Bigby, but there are obstacles like the fact that he's a wolf and has a dangerous job. Or a plot where some of the non - fable humans in Fabletown start to suspect that there's something strange going on and Bigby has to keep them from finding out the truth without using too much force.
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.
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 who has a special power that is unknown to the wolf pack. The pack initially suspects her but as they get to know her, they realize she can be an asset. For example, she might be able to communicate with nature in a way that helps them detect threats faster.
Maybe the OC is a young artist who moves to the area near Ame's family. The OC often sketches the beautiful natural scenery and one day catches a glimpse of Ame in his half - wolf form. Fascinated, the OC starts to draw Ame and this somehow draws Ame closer to the OC. They then embark on a journey of discovery together, with Ame showing the OC the hidden wonders of the forest.
A possible plot could be that the OC is a time - traveler who accidentally lands in the Teen Wolf universe. The four mates are drawn to the OC because of their unique knowledge of future events. However, changing the future might have unforeseen consequences. The OC has to balance their relationships with the mates and figure out a way to return to their own time without disrupting the fabric of the Teen Wolf world too much.
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.
For 'the wolf among us fanfiction', you might consider a story where Bigby has to go undercover in a non - fable community. This could lead to all sorts of interesting situations as he tries to keep his identity a secret while also dealing with the normal human world's problems. Or, you could write a fanfic about a fable character who has lost their powers and how they cope in Fabletown. It would be interesting to see how they interact with Bigby and other characters in this new, powerless state. Also, a time - travel fanfic where a character goes back in time to change an important event in Fabletown's history could be really cool.
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.
One idea could be a new banshee oc who discovers her powers during a full moon and has to deal with the chaos in Beacon Hills. She could befriend Scott and his pack and use her unique abilities to help them fight off new threats.