Well, it could be that Mjolnir has been lost in the wizarding world for centuries. Harry, Ron, and Hermione find it during one of their adventures. Ron tries to lift it first but fails. Harry then approaches it, and as he touches it, a surge of power runs through him. This new power allows him to see things in a different way. He can now sense the presence of Horcruxes more easily and also has the strength to break through some of Voldemort's most powerful defenses. The story could revolve around how they use Mjolnir's power in their fight against the Dark Lord without causing too much disruption in the magical balance.
One possibility could be a story where Harry Potter discovers an ancient magic that is somehow related to the power of Mjolnir. Maybe he has to prove himself worthy in a similar way Thor does, by showing great courage and selflessness. This could lead to him being able to use a power similar to that of Mjolnir for a crucial battle against Voldemort.
Well, in such a fanfiction, the characters from Harry Potter would be in for a shock. Yharnam is a very different and dangerous place compared to Hogwarts. Harry, Hermione, and Ron could find themselves facing challenges that require not just their magical knowledge but also a new level of courage. They might meet some of the hunters in Yharnam and learn about their ways of fighting. And perhaps, they could introduce some new magical concepts to the people of Yharnam, like the use of potions for different purposes than just healing.
In a Harry Potter - Hawkeye fanfiction, Hawkeye might be mistaken for a new kind of wizard. He could befriend Harry and his friends. Hawkeye could teach them about non - magical combat skills, while they introduce him to spells and potions. It would be interesting to see how his modern - day weapons and combat knowledge interact with the magical elements of the Potterverse.
In this fanfiction, perhaps there's a spell gone wrong that transports Harry and his friends to a prehistoric world full of velociraptors. They have to use their magic skills to survive in this new environment. Harry might use his Patronus charm to fend off the raptors at first, but then they gradually learn to communicate with the raptors using some kind of translation spell and together they try to find a way back to their own time.
It could be really interesting. Maybe Aquaman could visit Hogwarts and interact with the students. He might be amazed by the magic there, like the floating candles in the Great Hall. And perhaps he could teach the wizards about the underwater world of Atlantis, introducing them to mermaids and sea creatures they've never seen before.
It could be really interesting. Maybe it would involve Harry Potter characters in the strange and often dark world of Eraserhead. For example, Harry could find himself in a situation similar to the disturbing environments in Eraserhead, facing challenges that are not just magical but also of a psychological nature.
It could be really interesting. Maybe the characters from Harry Potter could somehow enter the world of Eyeshield 21. For example, Harry could use his broomstick skills to play American football in the Eyeshield 21 universe. Or Hermione could use her intelligence to come up with new strategies for the football teams.
In such a fanfiction, HK - 47 could be an ancient artifact that was hidden in Hogwarts long ago. When Harry and his friends discover it, they initially think it's just a strange magical object. But as they start to explore it, they realize it has a mechanical side too. And it might hold the key to defeating Voldemort, as it has powers that can nullify dark magic, being a creation from a different kind of 'dark' technology universe.
Well, in a Harry Potter - Rasputin fanfiction, Rasputin could be reimagined as a character with unique powers. For example, his supposed ability to heal in real life could be translated into some sort of magical healing ability in the fanfic. But he could also have a dark side, perhaps being influenced by the Dark Arts. He could interact with Harry and his friends, either as an ally or an enemy, depending on the plot. And his presence could disrupt the normal balance of power at Hogwarts.
Well, it could be a wild and wacky adventure. Picture Deadpool popping into Hogwarts, causing chaos with his fourth - wall - breaking antics while the Hogwarts students are trying to study magic. He might make fun of Snape's greasy hair or try to steal Harry's invisibility cloak for some 'fun' missions. And Harry, with his sense of justice, would be constantly trying to keep Deadpool in line.