You could create a fanfic where the walkers start to evolve in some unexpected way, like developing a limited form of communication. This would completely change the dynamic for the survivors. Maybe there's a young survivor who discovers they have an immunity to the walker bite but has to keep it a secret because others might try to use them as a test subject.
One idea could be to focus on a group of survivors who find an abandoned military base. They have to fortify it against both the walkers and other hostile groups. For example, they might discover hidden underground bunkers with supplies but also face booby traps left by the previous occupants.
One idea could be a group of survivors who find an abandoned military base and have to deal with both the undead and the secrets it holds. Another could be a story focused on a character who has a special ability to communicate with animals in the post - apocalyptic world, and how that helps the group survive. Maybe a fanfic about a community that tries to build a self - sustainable farm while fending off walkers.
One idea could be a story where the main character discovers a hidden community that has found a way to live in harmony with the walkers instead of constantly fighting them. They've developed a unique method of communication or control over the walkers, which throws the traditional survival narrative on its head.
A great plot for a 'Walking Dead OC fanfic' could be an OC who has a photographic memory. This OC could remember all the pre - apocalypse survival knowledge they read in books or saw on TV. They could recall details about building shelters, finding water sources, and making weapons. Their ability could make them a valuable asset to the group, but also a target as other groups might want to use their knowledge for their own survival. They would constantly have to balance between helping their group and protecting themselves from those who would take advantage of them.
One idea could be an OC who has a unique skill like being able to communicate with animals in the post - apocalyptic world. This could help the group find food or avoid danger. Another plot could involve an OC who discovers a hidden bunker full of supplies but has to deal with other survivors who also want it.
One plot idea could be a group of survivors in the post - apocalyptic world of The Walking Dead using 'Search' skills to find a rumored safe haven. They face various obstacles like zombies and other hostile groups along the way.
Well, perhaps Luke in the fanfic could start having strange dreams that seem to predict future zombie attacks. He then uses these dreams to his advantage to save his group multiple times. Or, he could find an ancient weapon that is extremely effective against the walkers but is also cursed. This would add an interesting moral and survival dilemma. Also, Luke might encounter a group of survivors who seem friendly at first but are actually planning to sacrifice him to the walkers. He has to outwit them to survive.
Perhaps the child OC is on a quest to find a missing family member in the post - apocalyptic world of The Walking Dead. They could encounter various groups along the way, some friendly and some not, which would create a lot of tension and character development.
One idea could be an OC who is a skilled medic. They could travel between different communities in the Kingdom, facing challenges like zombie attacks and distrust from some groups while trying to save lives. This OC could also have a backstory related to the pre - apocalypse medical field, which adds depth to their character.
A cool 'Walking Dead Crossover Fanfiction' idea is to cross it with 'The X - Files'. Mulder and Scully could be investigating the zombie outbreak. They might find out that it's not just a normal virus but some kind of government experiment gone wrong, which ties in with the conspiracy theories they usually deal with. And the characters from 'The Walking Dead' would be skeptical at first but then realize they need Mulder and Scully's help to figure out the real cause of the zombies.