One plot idea could be that Harry discovers a hidden portal in Hogwarts that leads to Doctor Strange's Sanctum Sanctorum. He then has to learn the ways of the mystic arts to close a rift that is endangering both the wizarding world and the world of Doctor Strange. Along the way, he teams up with Doctor Strange and they exchange knowledge about their respective magics.
One idea could be that a magical anomaly brings Harry Potter to the world of Dr Strange. Harry, with his unique magical knowledge from Hogwarts, could team up with Dr Strange to fight a new dark force that is threatening both their realms. Their different styles of magic would make for an interesting dynamic as they learn from each other.
One possible plot could be that Dr Strange is summoned to Hogwarts to train the students in advanced magic. He starts with Harry Potter, teaching him how to better control his magic and use it in more creative ways, like using time - based spells.
One possible plot could be that Harry Potter, being the Master of Death, somehow finds his way into the Marvel universe. Dr. Strange, sensing this strange and powerful presence, seeks out Harry. They initially clash due to their different magical understandings. But then they realize they can learn from each other. Harry could teach Dr. Strange about the true nature of death and how to face it without fear, while Dr. Strange could show Harry more advanced spell - casting techniques in a different magical system.
Well, it could be that Dr Strange uses his magic knowledge to train Harry Potter in different ways of spellcasting. Maybe he shows Harry how to manipulate time and space while casting spells, which could give Harry an edge in fighting Voldemort. He might also teach Harry about different magical dimensions and how to draw power from them.
The magic could blend in interesting ways. Harry's wand - based magic might be enhanced by Dr Strange's more esoteric and hand - gesture - based magic. For example, Harry could use his wand to direct the energy patterns he learns from Dr Strange.
Well, one interesting plot point is when the characters from the two universes first meet. For example, when Harry Potter meets Dr Strange, their different views on magic can lead to some really engaging dialogues. Another is when they have to combine their magical powers to defeat a common enemy. This often involves a lot of creativity in how the spells and magic from both worlds are used together.
One plot idea could be that Dr Strange discovers a prophecy that predicts the end of the magical world. To prevent this, he must rewrite the stars, which means he has to find a way to change the fated events. He embarks on a journey through different dimensions to find the key to rewriting the stars, facing various magical creatures and challenges along the way.
A possible crossover could involve the characters' moral compasses. Harry Potter has a strong sense of right and wrong based on his experiences at Hogwarts. Dr Strange, on the other hand, has a more complex view of morality due to his dealing with different dimensions and powers. A fanfiction might explore how they interact when faced with a difficult moral decision, like whether to sacrifice one life to save many.
One idea could be that Harry discovers he has the power to time - travel in a very unique way, not like the Time - Turner. He can enter different eras of the wizarding world's history and has to solve mysteries that are linked to his present. Another could be that he has a strange power of telepathy but only with dark creatures, which he uses to negotiate peace treaties. Maybe he also has the power to manipulate elements in a way no other wizard has, like creating new magical plants by combining the powers of fire and water.
One idea could be a what - if scenario. What if Strange and Christine had a moment of passion during a time - traveling adventure? Maybe they kiss in a parallel universe where they're not bound by the normal rules of their relationship in the main MCU timeline.