Well, perhaps a crossover where the Volturi from Twilight are intrigued by the experiment of the Maze Runner world. They might see it as a new form of control over a large group of humans. Meanwhile, Thomas from the Maze Runner could have some sort of special connection with a Twilight character, like Bella, and they work together to break free from both the Maze and the Volturi's potential threat.
A cool plot for the maze runner fanfiction could be that there is a traitor among the Gladers who is secretly working for the people who put them in the maze. This traitor could be slowly sabotaging their efforts to escape. Or perhaps the maze starts to change in really strange and unpredictable ways, like the walls start moving at random times instead of just at night. The Gladers then have to figure out a new strategy to deal with this. And what if there were other groups of kids in different mazes and they somehow find a way to communicate and team up to escape all the mazes together.
One idea could be exploring the backstories of the characters more in - depth. For example, what was Thomas' life like before he entered the maze? Another idea is to create an alternate ending where the Gladers find a different way to escape the maze and deal with the outside world. You could also write a fanfiction about a new group of people who enter the maze after the events of the original story and how they interact with the remaining elements of the maze and any surviving Gladers.
One idea could be that the OC has a special ability, like being able to communicate with the creatures in the Maze. This could change the whole dynamic of how the Gladers interact with the Maze. Another plot could be that the OC is from outside the Glade but has a connection to the people who put them there, and they struggle with whether to reveal this secret or not. Maybe the OC discovers a hidden passage in the Maze that no one else has found, leading to a whole new area full of both danger and answers.
Well, perhaps some of the Gladers accidentally get sent back in time to when the Creators were still planning the Maze. They could then try to sabotage the plans from the inside. They might steal the blueprints of the Maze, or change the types of creatures that are supposed to be put in the Maze. This would completely change the dynamic of the original story and create a whole new set of challenges and adventures for them.
Another idea is that the Death Eaters in Harry Potter create a new kind of maze similar to the one in the Maze Runner as a form of torture or experiment. Harry and his friends then team up with the Gladers to escape this new, magical maze.
One idea could be exploring the backstory of the girl character before she entered the Maze. Maybe she had a special talent or a hidden past that no one in the Glade knew about. For example, she could have been a trained fighter in a secret society outside the Maze world.
One idea could be that Naruto and the other ninjas are trapped in the Maze Runner world. Naruto uses his shadow clones to explore different parts of the maze. They could encounter new types of creatures that are a mix of Naruto's world and the Maze Runner world. For example, some sort of beast with both the characteristics of a Nine - Tailed Fox and a Griever.
An OC who is a natural leader but has a very different leadership style from Alby. Instead of strict rules, they focus more on building a community based on trust and friendship. This could cause some initial conflict as the Gladers are used to Alby's way, but in the long run, it could lead to new solutions for escaping the Maze.
One possible plot could be that Naruto and his friends from Konoha are somehow transported into the Maze Runner world. Naruto's determination and never - give - up attitude would immediately clash with the despair in the Glade. He could use his shadow clone jutsu to explore the maze faster, and his rasengan could be a powerful weapon against the Grievers. His friends like Sasuke and Sakura could also use their unique skills, like Sasuke's sharingan to detect hidden patterns in the maze and Sakura's medical skills to treat the injured Gladers.
A plot might involve the Maze Runner characters being transported to Camp Half - Blood. Thomas and his friends would be shocked to find out about the existence of demigods, Greek gods, and the magical world. The Maze Runner group could learn combat skills from the demigods, like sword fighting. Meanwhile, the demigods would be intrigued by the technology and the complex maze - like problems the Maze Runner characters had to face. They could all work together when an ancient evil from the Percy Jackson world, sensing the new arrivals, decides to target the combined group, believing they could be a threat to its plans.