Annabeth Chase would be an exciting character to center on. Her intelligence and strategic thinking would be a great asset in the maze. She could quickly analyze the layout of the maze and come up with plans. She might also be the one to bridge the gap between the two groups, as she's good at understanding different people and situations. Her knowledge of architecture and mazes from her own world could be applied to solving the mysteries of the Maze Runner's maze. And her relationship with Percy would add an extra layer of drama, especially when dealing with the new and dangerous situations in the crossover world.
Sasuke could be a fascinating character to focus on. His brooding and powerful nature would create an interesting contrast in the Maze Runner world. He could use his sharingan to gain an edge in the maze, seeing things that others can't. And his complex personality, with his thirst for power and his loyalty to Naruto (in some ways), would add depth to the story. He might initially be at odds with the Gladers but then come to respect them as he realizes their own forms of strength.
Annabeth Chase could be an interesting character to focus on. She is highly intelligent and strategic. In a crossover, she could use her knowledge of architecture and battle strategies to help Eragon and his allies. She might study the magic in Alagaesia and find similarities or differences with the powers of the demigods. Her relationship with Percy could also be explored in a new light, especially when they are in a completely different world. How would they support each other in this new and strange environment? And how would she interact with the characters in Eragon's world?
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.
One possible plot could be that the demigods from Percy Jackson's world are somehow transported to the Glade in the Maze Runner. Percy, Annabeth, and Grover could use their unique skills. Percy's water - controlling abilities could help with finding water sources in the Glade or even fighting the Grievers in a new way. Annabeth's strategic mind would be useful in trying to figure out the maze, and Grover could sense any nature - related secrets in the strange new environment.
The characters would likely start off with suspicion. For example, the Gladers from Maze Runner are used to a world of order within the Glade and strict rules. When they meet Percy and his friends who are more free - spirited and used to a world of magic, they might be wary. Percy might be curious about the technology - like things in the Glade, while Thomas could be shocked by Percy's ability to control water. But over time, they'd learn to trust each other as they realize they need each other's skills to face the common threats.
It could be Percy. His control over water and his combat skills are really strong. He has faced so many powerful enemies and survived. In a collision with the Maze Runner world, his powers would give him an edge in most situations, like if there was a flood in the Maze or he had to fight a Griever in water.
Percy and Thomas are often popular to pair. Percy's heroic and sometimes reckless nature combined with Thomas's leadership and determination can create an interesting dynamic. They can learn from each other's strengths and weaknesses.
I think Mal from Descendants would be really interesting. If you combine her with the Percy Jackson universe, her skills in magic and her somewhat villainous past could create a lot of drama. She could be a bit of an outcast among the demigods at first because of her heritage, but then prove herself as a valuable ally. For example, she could use her magic to help the demigods in a battle against a new type of monster that is resistant to normal demigod powers.
I think Percy Jackson himself would be really interesting. He has such a strong personality and his powers are unique. In a fanfiction with Descendants, he could bring his demigod skills and his sense of adventure. He might be a bit of a fish out of water in the Descendants' world, which could lead to some really funny and exciting situations. His loyalty and determination would also make him a great character to drive the story forward.
Nico di Angelo would be an interesting choice. His dark and brooding nature along with his powers over the dead would be a contrast to the more light - hearted aspects of the Harry Potter world in some ways. He could introduce the wizards to the concept of the Underworld and the spirits. And his ability to shadow - travel could be used in some really creative ways, like getting the group in and out of dangerous situations quickly, whether it's in Hogwarts or in the magical areas related to Greek mythology.