In a 'Harry Potter and Thor crossover fanfic', the plot could start with Thor's hammer, Mjolnir, being stolen by a powerful dark wizard in the Harry Potter universe. Thor then arrives in search of his hammer. Harry Potter and his friends offer to help. Along the way, Thor discovers the unique magic of the wizarding world, like spells and potions. Meanwhile, the Hogwarts students are in awe of Thor's godly powers. They face many challenges together, including battles with dark creatures and the dark wizard's minions. Eventually, they find the hammer and Thor helps the wizards defeat the dark wizard once and for all.
Well, perhaps in this crossover fanfic, there's a magical rift that opens between Asgard and Hogwarts. Thor, being the adventurous type, decides to explore the other side. He meets Harry Potter, who is amazed by Thor's strength. They then discover that Voldemort has made a pact with some of Thor's enemies in Asgard. To stop the combined evil forces, Thor teaches the Hogwarts students some of his combat skills while Harry Potter and the wizards use their magic to help Thor understand the magical world better, all in the effort to defeat their enemies.
One possible plot could be that Thor somehow gets transported to the wizarding world. He might initially be confused by the magic there as it's different from his Asgardian powers. Harry Potter and his friends could be intrigued by Thor and his hammer. They might team up to fight a common enemy, perhaps a dark wizard who has somehow got hold of some Asgardian artifact and is misusing its power.
One possible plot could be that Thor ends up in the wizarding world of Harry Potter. Maybe the Bifrost malfunctions and he lands near Hogwarts. He could be mistaken for a very powerful wizard at first. Then he teams up with Harry Potter and his friends to fight against a new dark threat that is using both magic and some form of Asgardian - like power. Thor could teach the wizards about Asgardian combat and they could teach him more about the nuances of magic.
A powerful dementor - like being that has been corrupted by Asgardian dark magic. This entity could be draining the life force of both wizards and Asgardians. It would be up to Thor and Harry Potter to find a way to stop it, as it poses a threat to both of their worlds.
It could be Loki. Since he has a knack for causing trouble, he might find a way to cross over to the wizarding world. He could manipulate the dark wizards and use their magic for his own devious plans. Maybe he wants to steal the Philosopher's Stone to gain immortality and use it to take over Asgard as well.
Well, it could be that Harry Potter uses his magic skills like the Patronus charm against Thor's lightning. Maybe Thor mistakes Harry's magic for some new Asgardian sorcery at first. And then they start to fight over some misunderstanding, like a magical artifact that Thor thinks is from Asgard but Harry knows is important for the wizarding world.
One possible plot could be that the Halliwell sisters from 'Charmed' somehow get transported to the wizarding world of 'Harry Potter'. They could use their powers to help Harry and his friends in a battle against Voldemort. For example, Piper could freeze Death Eaters with her time - stopping power, while Phoebe could use her premonition power to foresee Voldemort's next moves.
One idea could be that the Avengers find themselves magically transported to the wizarding world. Thor, with his Asgardian magic, might have an interesting interaction with the Hogwarts professors. Maybe they team up to fight a new, combined threat that is both magical and technological.
Yes, there are likely some out there. Fans often create crossover fanfics that combine different universes like 'Hitman' and 'Harry Potter'. These can be really interesting as they blend the magic and mystery of 'Harry Potter' with the stealth and assassin - like nature of 'Hitman'.
Well, Thor is a very confident and powerful character. He might be initially a bit baffled by the wizards and witches at Hogwarts. Harry, on the other hand, would be in awe of Thor's strength and abilities. Thor could probably teach Harry some physical combat skills, while Harry could introduce Thor to the subtleties of wizard magic like apparition.
One idea could be that Thor somehow ends up at Hogwarts. Maybe he's on a mission in the wizarding world and his Asgardian magic interacts in strange ways with the magic of Hogwarts. For example, his lightning powers could cause some chaos during a Potions class when it accidentally zaps a cauldron.
Maybe there's a prophecy in both worlds that foretells of a combined force from the wizarding world and the ninja world being the only way to defeat an ultimate evil. So, Naruto and Harry are brought together. They face challenges in understanding each other's cultures and powers at first. But as they train together, they find ways to merge their skills. For instance, Naruto's rasengan could be enhanced with a magical spell to create a more powerful attack.