One possibility could be the magic systems interacting. In Harry Potter, magic is more about spells and potions, while in Highschool DxD, it's more about the power of Devils and Angels. If they were in a crossover, perhaps the characters from Highschool DxD could learn the structured magic of Harry Potter, like Hermione teaching Issei how to brew a Polyjuice Potion. This would create some really fun and chaotic situations.
One possible plot could be that Harry Potter, while on a new magical adventure, somehow gets transported to the world of Highschool DxD. He could use his unique magic skills to help the characters in Highschool DxD deal with their own supernatural threats. For example, his Patronus charm might be effective against some of the evil creatures in the DxD world.
It's really hard to say. Harry Potter has his powerful magic from Hogwarts and his connection to Voldemort which gives him a certain power boost. But in the DxD world, characters like Great Red are extremely powerful. If Harry was able to combine his magic with the power of a Sacred Gear, he could potentially be a very strong force. However, characters like Sirzechs Lucifer also have a vast amount of power. So it could be a toss - up depending on how the crossover is written.
One idea could be that Harry Potter, while exploring some new magic, accidentally opens a portal to the DxD world. He then has to adapt to the new rules and powers there. Maybe he teams up with Issei and they use a combination of Hogwarts magic and Sacred Gears to fight off a common enemy.
Yes, there are likely many non - sexual crossovers. Fans often create crossovers to explore how the magic of Harry Potter might interact with the supernatural elements of Highschool DxD in a more family - friendly or plot - driven way. They might imagine characters from both universes teaming up to face a common enemy or sharing knowledge about their respective worlds.
Yes, there are likely some crossover fanfics out there. Writers often like to combine different popular universes to create unique stories. In such a crossover, you might see characters from Harry Potter interacting with those from High School DxD in all sorts of interesting ways, like Hogwarts students using magic in the world of High School DxD or the devils in High School DxD being introduced to the wizarding world.
Yes, there might be. The 'fanfiction' world is vast and diverse. There are often crossovers that combine different popular franchises in unexpected ways. However, the quality and nature of such a fanfiction can vary greatly. Some might be really creative, while others could be a bit of a mess.
The magic system in Harry Potter could be integrated by having characters from Highschool DxD learn spells. For example, Issei could learn the Wingardium Leviosa spell to lift objects during battle, giving him an unexpected advantage. The Portkey concept could also be used to transport characters between the two worlds quickly.
The Gryffindor characters from Harry Potter like Harry himself would probably be very bold and upfront when interacting with the characters in Highschool DxD. They might immediately jump into helping with any dangerous situations. Hermione, with her vast knowledge, could start analyzing the different powers and hierarchies in the DxD world. And Ron might be a bit more cautious but still curious.
Sure, it's quite possible. Fanfiction writers love to blend different fictional worlds. In a 'The Mummy (2017)' and 'Harry Potter' crossover, we could see the mummy's powers being pitted against the spells of Hogwarts students. Maybe the mummy is brought back to life in the wizarding world and causes chaos. There are endless possibilities for interesting storylines in such a crossover fanfiction.