What could be an interesting plot in a Harry Potter - A Song of Ice and Fire crossover fanfic?

A really interesting pairing could be Hermione and Tyrion. Hermione is extremely intelligent and well - read, and Tyrion is also very clever and a great strategist. They could share their knowledge of different forms of politics and magic. Another good pairing would be Harry Potter and Jon Snow. Both are heroes in their own right, with a strong sense of justice. They could learn from each other's experiences of growing up as outsiders and leading in difficult situations.

One idea could be that the characters from Fire Emblem: Three Houses are magically transported to the wizarding world of Harry Potter. They could be sorted into Hogwarts houses based on their personalities. For example, Edelgard might be a Slytherin as she is ambitious and a natural leader. Then they could learn magic and help the students of Hogwarts in a battle against a new dark wizard threat, using their unique combat skills from their own world in combination with magic.

The crossovers can bring unique character interactions. You might see characters from different universes combining their strengths and facing new challenges together, which is super exciting!

One possible plot could be that Yuuri Katsuki, a skater in Yuri on Ice, somehow gets transported to the wizarding world of Harry Potter. He could be sorted into a Hogwarts house, perhaps Gryffindor for his courage on the ice. He might start teaching the students figure skating as a new form of magical movement, and in the process, he befriends Harry Potter and they help each other face their respective challenges. Yuuri could use his skating skills to navigate the dangerous corridors of Hogwarts during a time when the school is under threat, like when Voldemort is rising again.

Perhaps in the crossover, the Prototype virus could somehow infect the magical creatures in the Harry Potter universe. This would lead to a crisis where normal spells and magic can't stop the infected creatures. Harry and his friends would have to seek help from Mercer, who understands the virus. Together, they could try to find a way to either cure the infected or contain the spread. Mercer might use his own knowledge of the virus and his powers to fight the infected creatures, while Harry uses his magic skills to protect Mercer from magical attacks.

One possible plot could be that the One Ring somehow finds its way into the wizarding world. Harry and his friends discover it and realize its dark power. Meanwhile, some Hobbits from Middle - earth are accidentally transported to Hogwarts. They team up with the Hogwarts students to keep the Ring away from the dark wizards who want to use it for evil, just like Sauron in their world.

A possible plot is that a powerful magical artifact in the wizarding world is actually a key to an ancient Stargate on Earth that has been long forgotten. Harry and his friends, along with the Stargate team, embark on a quest to find this Stargate. Along the way, they face challenges from dark wizards who also want the artifact for their own evil purposes and the Goa'uld who sense the power of the artifact. They must work together, using both magic and technology, to reach the Stargate and unlock its secrets.

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.

One notable thing could be the combination of different character dynamics from the two original universes. It's exciting to see how characters interact in a new setting.

A possible plot is that Voldemort discovers the existence of the demigods and tries to use their powers for his own evil purposes. He sends his Death Eaters to capture some demigods. Percy and his friends manage to escape and seek refuge at Hogwarts. At Hogwarts, they learn about magic in a whole new way while also teaching the wizards and witches about their own powers. The two groups then have to combine their skills, like the demigods' combat abilities and the wizards' spell - casting, to fight against Voldemort and his new - found allies from the world of Greek mythology.