Well, Hermione could be really intrigued by Doctor Strange's library. She might ask him all sorts of questions about the books and scrolls he has, and they could exchange knowledge about different magical concepts. For example, Hermione could learn about the use of astral projection from Strange, and in return, she could teach him some of the more complex spells from the wizarding world.
The characters would have some really interesting interactions. For example, Hermione might be both fascinated and a bit frustrated by Harry's new powers. She would try to study them while also scolding him if he uses them recklessly. Ron, on the other hand, would probably be in awe and a bit jealous at times. And the professors at Hogwarts would be very cautious about Harry's powers, especially Snape who would be suspicious as always.
Well, the magic in Harry Potter is more about incantations and potions, while Doctor Strange's magic is more about using his hands to create spells and manipulate the fabric of reality. In fanfiction, they could interact in a way that Harry Potter characters learn to use some of Doctor Strange's hand - based magic techniques. For example, Hermione might be really interested in how Doctor Strange can create portals and would try to learn the principles behind it.
Well, Doctor Strange's magic is more about manipulating energy and dimensions. His spells are based on gestures and incantations from the Marvel universe. Harry Potter's magic is more about using wands and specific spells like 'Expelliarmus' or 'Lumos'. If they were to interact, Doctor Strange might be able to enhance the power of Harry's spells by adding his own energy manipulation. For example, if Harry were to cast a shield charm, Doctor Strange could use his magic to make it stronger and cover a larger area.
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.
One idea could be a crossover where Doctor Strange uses his magic to visit the wizarding world of Harry Potter. He could meet Harry and help him with some of his more difficult magical problems, like dealing with a particularly powerful dark magic spell that the Hogwarts professors are stumped by.
Sherlock could be highly skeptical of Doctor Strange's magic at first. He might constantly try to find logical explanations for the magical phenomena. Doctor Strange, in turn, could be amused by Sherlock's attempts and then gradually show him the true power of magic. For example, Strange could use his magic to recreate a crime scene in a different way to help Sherlock see new angles of a case.
The RWBY characters are used to a world full of Grimm and Huntsmen. When Doctor Strange arrives, his different style of magic and his more 'cosmic' view of things would be a shock. For example, he might use his magic to create portals, which could be used for both transportation and as a weapon. The RWBY team would have to adapt to this new form of combat. Doctor Strange, on the other hand, would have to understand the RWBY characters' reliance on Dust and their team - based combat. He might find their loyalty to each other and their cause quite inspiring and adjust his own actions accordingly.
Another possibility is a story in which a young wizard in the Harry Potter world discovers a hidden portal that leads to the dimension where Doctor Strange operates. This wizard, inspired by Strange, begins to study a new form of magic that combines the principles of both universes. They then return to Hogwarts and start to teach their friends this new hybrid magic, which causes quite a stir among the faculty and students alike.
Hermione Granger is a very common character. Since she is Harry's best friend, she would likely be there to help him understand and control his new superpowers. She might research in the library to find out how these powers came about and how to use them effectively. Ron Weasley is also common. He would probably be both in awe and a bit jealous of Harry's new powers at first but would still support him in the end.
The magic systems could also interact in a more complex way. Maybe the wizards from Harry Potter's world are actually using a form of the mystic arts, but they just don't know it. In fanfiction, Stephen Strange could discover this connection and help the wizards unlock new levels of their magic. This could lead to new spells and abilities for the Hogwarts students.