Well, they could have all sorts of adventures. Maybe they'd visit different magical and alien worlds. The Doctor could show Harry some truly out - of - this - world places that even the wizarding world hasn't seen. And Harry could introduce the Doctor to the magic of Hogwarts, like the secret passages and the magic spells.
In this fanfiction, Harry might see a world where magic has evolved in unexpected ways. For example, there could be new spells that are far more powerful and complex than the ones he knew. He could also find that Hogwarts has changed, perhaps with new buildings or different teaching methods. And maybe he would encounter descendants of his friends, who have their own unique stories to tell.
Maybe Harry has some strange magical illness that normal wizards can't cure. So he has to seek help from a very special doctor who might have some unique remedies.
Well, perhaps the Doctor could use the TARDIS to visit Hogwarts. He might help Harry and his friends with some really tough magical problems using his advanced alien technology. For example, when they face Voldemort, the Doctor could come up with some out - of - the - box solutions that the wizards never thought of.
In some fanfictions, the doctor might discover some hidden magical ailments that were overlooked in the original series. Maybe a strange magical energy imbalance that's causing his sporadic bursts of power.
In a fanfiction where Harry Potter meets Doctor Strange, the possibilities are endless. Harry, who is used to the structured magic of the wizarding world, would be fascinated by Strange's more fluid and unpredictable magic. Strange, on the other hand, would be intrigued by the hidden magical society that Harry comes from. They could exchange knowledge about different dimensions. Harry could learn about the multiverse from Strange, and Strange could gain insights into the magical dimensions that exist within the Harry Potter universe. They might also have a friendly duel to test each other's skills, which would be a spectacular display of two very different kinds of magic.
It could be that after the war, Harry feels a need for a new purpose. He might start learning about Muggle healing methods out of curiosity. His quick - learning skills, which he developed during his years at Hogwarts, would help him quickly understand medical concepts. He could also use magic to heal some ailments that normal medicine can't, thus becoming a very unique doctor.
In a fanfiction scenario, it could be that the Time Stone has some sort of connection to the magic in the Harry Potter world. Doctor Strange is in trouble while dealing with an enemy who wants to misuse the Time Stone. Harry Potter, with his knowledge of time - turning devices like the Time - Turner, manages to outwit the enemy and save Doctor Strange.
In the 'Immortal Harry Potter meets the Doctor fanfic', it could be that the Doctor is initially skeptical of Harry's immortality. Harry, on the other hand, might be in awe of the Doctor's TARDIS. They could exchange knowledge, with Harry teaching the Doctor about magic and the Doctor introducing Harry to advanced alien technologies. Their combined skills could lead to adventures across different planets and magical realms.
In this fanfiction, perhaps Harry would introduce the Doctor to the wizarding world. The Doctor could then use his scientific knowledge to understand the magic there, and they might team up to fight some common enemies that threaten both the wizarding world and the universe at large. For example, there could be an alien race that wants to harness the power of magic for their own evil purposes. The Doctor's technology and Harry's magic would make for an interesting combination to combat such a threat.
Well, perhaps Harry and the 9th Doctor could go on an adventure through time and space. They might encounter strange alien species together.