Yes, there might be some out there. Fanfiction writers often come up with creative crossovers. You can try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net. There could be some writer who thought it would be interesting to make Harry Potter and Thor brothers in an alternate universe scenario.
In such a fanfiction, there would be a lot of cultural clashes and interesting interactions. Harry, being raised in the wizarding world, would have to adapt to Asgardian customs and vice versa for Thor. The story could explore how their different upbringings shape their personalities. Also, their combined powers could be a great asset in battles. For example, Harry could use magic to enhance Thor's lightning attacks or Thor could use his strength to protect Harry during a wizard duel. It would be a story full of action, magic, and brotherly bonding.
Well, in this fanfiction, we might see Harry using his Patronus to protect Thor in battle. Since he's the older brother, he'd probably be very protective. The story could also involve Harry introducing Thor to Dumbledore, and they'd all come up with strategies to fight against dark forces from both their worlds. It could blend the magic of Hogwarts with the power of Asgard in a really unique way. There might be scenes where Thor tries to fly on a broomstick and fails miserably at first, but then Harry teaches him the proper way. Also, the fanfic could explore how their different upbringings, one in Asgard and one in the wizarding world, shape their relationship.
A possible start could be a prophecy in both the wizarding world and Asgard. The prophecy foretells of a great danger that can only be averted if a wizard from Hogwarts and a warrior from Asgard join forces. Harry Potter and Thor are then made aware of this prophecy and set out on a journey to find each other and figure out how to stop the impending doom.
Well, it's very possible. Given the popularity of both the Harry Potter series and the Norse mythology with Thor and Loki, some fans might have been creative enough to write such a crossover. However, not all fanfictions are easy to find. You may need to use specific search terms and filters on the relevant platforms to locate one. It might also depend on how new or old the fanfiction is. Some older ones could be buried deep in the archives, while newer ones might be more visible if they gain popularity quickly.
One common theme is the clash of different power systems. The magic from Harry Potter and the divine powers of Thor often collide and combine in interesting ways.
In this fanfiction, Harry's change is quite significant. Firstly, his view of himself and his place in the world is completely altered. Instead of just being a wizard, he is now part of something much bigger. This new identity gives him a different kind of courage. He's not just fighting for the wizarding world against Voldemort, but also has a connection to Asgard. His relationships with his friends also change. They might see him in a new light, and he might have to deal with their different reactions. He could become more of a leader, using his new powers and status to inspire others. And his magic might even be influenced by his Asgardian heritage, making it more powerful or having different manifestations.
The plot would change a great deal. For one, Harry would be much more powerful physically. So when facing Voldemort, he could use Thor's strength in combat, not just rely on magic. He might be able to take on Death Eaters more easily.
Fanfiction often takes creative liberties. It could be that there is a cross - over event that changes the nature of Thor's hammer's worthiness test. Maybe a powerful magical entity in the Harry Potter universe meddles with the hammer's magic. Harry Potter has shown great moral fiber throughout his adventures. His ability to love deeply, his sense of justice, and his unwavering determination against evil could be seen as the 'worthiness' factor by the hammer's magic, allowing him to lift it.
It's hard to say for certain. The Harry Potter fanfiction community is vast and diverse. Some writers like to create alternative universes where characters have completely different relationships. But given the nature of Harry and Lucius in the original series - one being the hero and the other a Death Eater - making them brothers would require a great deal of imagination and explanation. The writer would need to explore how this new relationship would affect the plot, the other characters, and the overall themes of the story. It might also change the way we view the magical world's social and political structures as they are presented in the books.