One idea could be that the Hulk somehow gets transported to the wizarding world. Maybe a magical experiment gone wrong by a Hogwarts student creates a portal. The Hulk's brute strength would be a shock to the wizards and witches. He could end up causing chaos in Hogwarts, knocking down walls and scaring students. Wizards would try to use spells on him, but his strength might make him resistant at first.
Another possibility is a scenario where Voldemort decides to expand his reach into the non - magical world and Batman becomes aware of this threat. He would then enter Hogwarts undercover to learn about magic and form an alliance with the Order of the Phoenix. The contrast between Batman's brooding, non - magical detective nature and the magical world would make for an interesting story.
One idea could be that Lucifer somehow ends up in the wizarding world. Maybe he's intrigued by the magic there and decides to play some tricks on the Hogwarts students. He could start by disguising himself as a new dark arts teacher, causing chaos in the classrooms.
There's also 'Link Potter and the Chamber of Secrets' which is a crossover with 'The Legend of Zelda'. It's really cool as it blends the two very different universes. The author manages to incorporate elements of Zelda like the Triforce and Link's abilities into the world of Hogwarts. It's full of exciting adventures and interesting interactions between the characters from both franchises.
One idea could be that Killmonger somehow finds his way into the wizarding world of Harry Potter. Maybe he stumbles upon a magical portal while on one of his missions. He could then use his combat skills and strategic mind to navigate the complex politics of the wizarding world, perhaps forming an unlikely alliance with Harry Potter to fight against a common dark magic threat.
A third idea is to create a crossover where the villains from both worlds team up. The evil forces in the Sorcerer's Apprentice world and Voldemort's Death Eaters could join forces. The heroes from both universes would then have to work together to defeat this combined evil. This would involve the Sorcerer's Apprentice character and Harry Potter, along with their friends, strategizing and using their unique magical abilities.
A very common one is Sherlock Holmes. Imagine Harry being raised by the brilliant detective. He would grow up with a sharp mind for deduction, which could be very useful in solving the mysteries within the wizarding world. Another is Gandalf from 'The Lord of the Rings'. Gandalf could teach Harry a different kind of magic and wisdom, which would shape Harry into a very different kind of wizard.
Hogwarts reads Harry Potter crossover fanfiction contributes to the fandom in multiple ways. Firstly, it provides a platform for fans to express their love for the series in a creative way. Writers can add their own unique ideas and concepts to the existing Harry Potter world, which in turn can inspire other fans. Secondly, it helps in the continuous exploration of the lore. Since the official series has ended, fanfiction allows fans to dig deeper into the world of Hogwarts, its characters, and the magic system. It also promotes discussions and debates within the fandom, as different fanfictions can have varying interpretations of the same elements.
A third concept could be that a magical object from the Harry Potter world, like the time - turner, is found in the Marvel universe. Captain America and the Avengers have to figure out how to use it. Meanwhile, Harry and his friends are searching for the time - turner in their world too. Eventually, their paths cross as they both try to understand the power of this object.
Yes, there are quite a few out there. You can start by looking on fanfiction platforms like Archive of Our Own. Some of these crossovers blend the magic system of Harry Potter with the dark and gritty universe of Warhammer in really interesting ways, like having Hogwarts students interact with Warhammer characters.