One idea could be that Jean Grey, using her telepathic powers, senses a strange magical anomaly in the wizarding world. She travels there and meets Harry Potter. Together, they try to figure out if there's a connection between the mutants' powers and magic. Maybe they discover a hidden force that threatens both their worlds.
Perhaps in the fanfiction, Voldemort discovers Jean Grey's existence and tries to use her powers for his own evil purposes. Harry, being aware of Voldemort's plans, teams up with Jean to stop him. Jean's ability to read minds and manipulate matter could give them an edge against Voldemort's dark magic.
Another plot could involve Jean Grey being sent to the wizarding world as part of a mutant - wizard exchange program (a made - up concept for the fanfic). She's placed in Hogwarts and she and Harry Potter become friends. They start to learn from each other's abilities, with Harry teaching Jean about magic and Jean showing Harry how to better control his emotions using her telepathy skills.
One possible plot idea could be that Harry, as Jean Grey's son, discovers he has both magical and mutant abilities. He might struggle to keep the wizarding world from finding out about his mutant side, fearing they would see him as a threat. Another could be that he uses his telepathic abilities (inherited from Jean) to excel in certain magical subjects like Legilimency.
Well, a plot could involve Spiderman being injured in a fight and Jean Grey using her healing abilities (which she has in some storylines) to save him. Then, they start to train together, with Spiderman teaching Jean Grey some of his acrobatic moves and Jean Grey helping Spiderman better understand and control his 'spider - sense'. This could lead to a deeper friendship and perhaps a romantic relationship as they face more challenges together, like a powerful mutant - villain who wants to use Jean Grey's powers for evil.
One plot idea could be that they meet during a multiverse - related event. Maybe the fabric of reality is torn, and they end up in each other's universes. They have to work together to fix the problem while also dealing with their growing feelings for each other.
One interesting story could be where Jean Grey's telepathic abilities are used to understand the magical world of Harry Potter in a unique way. Maybe she helps Harry Potter deal with the mental stress caused by Voldemort's presence by using her powers to soothe his mind.
In a fanfiction, Jean Grey might be a new teacher at Hogwarts. She could teach a class on mental defenses, which would be extremely useful for the students, especially Harry who has to constantly deal with Voldemort's attempts to invade his mind. Her unique abilities would bring a whole new dimension to the Hogwarts curriculum.
A plot could involve Naruto traveling to the X - Men universe to learn more about his mother, Jean Grey. Along the way, he has to adapt to the different world, make new friends, and face new enemies. He could also bring some of his ninja skills to the X - Men world and teach them new ways of fighting. And maybe he discovers a way to combine his ninja chakra with Jean Grey's mutant powers for a super - powerful ability.
One idea could be a crossover where Harry Potter's magical world collides with the mutant abilities of Wanda Maximoff and Jean Grey. They could team up to fight a common enemy that threatens both the wizarding world and the mutant world. Maybe a dark sorcerer is trying to use mutant powers for his own evil deeds and they have to combine their skills to stop him.
In this fanfiction plot, a powerful dark force is threatening both the world of mutants and the wizarding world. Harry Potter and Jean Grey are chosen by their respective communities to investigate the source of this threat. As they work together, they discover that their powers complement each other in unexpected ways. Their relationship grows from friendship to love during their adventures. They decide to get married as a sign of their commitment not only to each other but also to the joint fight against the dark force. Their marriage then becomes a symbol of hope for the combined forces of wizards and mutants, and they lead the charge to defeat the evil that looms over both their worlds.
Another concept could be that Christian Grey somehow gains magical powers and attends Hogwarts. He could use his charm and dominance in a different way among the students and teachers, perhaps even getting into a power struggle with Snape.
One common theme is the clash and combination of different powers. Since Jean Grey has mutant powers and the Harry Potter characters have magic, stories often explore how these two types of powers interact. For instance, when Jean Grey tries to use her telekinesis in a duel at Hogwarts against a wizard using a spell.