A cool plot might involve a character from High School DxD being sent to Hogwarts. Picture Issei suddenly finding himself in the middle of a wizarding school. He would be the odd one out, not knowing any magic but having his own unique powers from the DxD world. This could lead to a lot of comical situations as he tries to fit in and also deal with the threats in the Harry Potter universe, like dark wizards or magical creatures.
Perhaps there could be a situation where the magical artifacts from both universes are being hunted by a powerful, unknown force. The characters from Harry Potter and High School DxD would have to team up to protect these artifacts. The wizards could offer their knowledge of magic spells and potions, while the characters from DxD could use their combat skills and unique abilities. This would create a great adventure filled with battles, mystery and friendship.
One possible plot could be a crossover where the magic from Harry Potter world somehow seeps into the High School DxD universe. For example, the Hogwarts students end up in the DxD world and have to adapt to the different rules regarding devils, angels and fallen angels. They could use their magic to help or hinder the various factions in DxD depending on their motives.
There could be an interesting story where the Red Dragon Emperor's powers are introduced into the Harry Potter universe. Maybe he could attend Hogwarts and cause quite a stir among the students and faculty. His unique abilities might be seen as both a threat and an asset in the wizarding world.
It could be a wild and unique story. Imagine the magic of Harry Potter in the same world as the ghouls from Tokyo Ghoul and the devilish elements of High School DxD. Maybe the characters from each would form unexpected alliances. For example, a Hogwarts student could team up with a ghoul to fight against the devils from High School DxD in a battle for some sort of magical artifact. Or perhaps the different power systems would interact in strange ways, like a wizard using spells to counter a ghoul's kagune while also fending off a devil's power attack.
Yes, there are likely fanfictions that combine the two universes in a non - sexual way. Many fans enjoy creating crossovers that focus on adventure, friendship, or the characters facing new challenges together. For example, they might write about Naruto characters ending up in the High School DxD world and having to adapt to its unique rules and magic systems while still maintaining their own ninja skills and values.
One idea could be that Naruto is somehow transported to the world of High School DxD and meets Moka. He could use his ninja skills in the battles that take place in the DxD world. Maybe he teams up with Moka to fight off common enemies.
One idea could be a crossover where Naruto is somehow transported to the world of High School DxD. He meets Gabriel, and they team up to face a common threat. Maybe a powerful devil or a new, unknown enemy. Naruto's ninja skills could be a great asset in the battles of the DxD world.
A Naruto - High School DxD fanfiction with the concept of immortality could start with Naruto being summoned to the DxD world by an unknown force. Since he's immortal, he doesn't fear death like many in the DxD world do. This could lead to him taking on more dangerous quests or getting involved in the wars between the different species. He could also use his immortality to experiment with different powers and techniques in the DxD world without the risk of dying, which would make him a very formidable and unpredictable character.
One possible scenario in such a fanfiction could be that the magical elements from Harry Potter, like spells and potions, are introduced into the Highschool DxD world. Maybe a character from Harry Potter somehow ends up in the Highschool DxD universe and has to deal with the different rules and threats there. For example, a Hogwarts student might be shocked by the devils and angels in Highschool DxD. Regarding the 'death' aspect, it could be a central plot point where a character's death (either from Harry Potter or Highschool DxD) sets off a chain of events that forces the two worlds to interact more closely.
One idea could be a crossover where the characters from Katekyo Hitman Reborn end up in the world of High School DxD. For example, Tsuna and his friends could be transferred to the school in High School DxD and have to deal with the devils and angels there. They might use their unique abilities from Katekyo Hitman Reborn to survive and adapt in this new and dangerous environment.
Well, a fanfiction like this could be really interesting. One way it could work is by having a character from Naruto world somehow end up in the High School DxD universe and interact with the archangels there. Maybe Naruto himself could gain some new powers related to the angelic realm in this crossover. He could learn about different hierarchies of angels which are very different from the ninja system he's used to.
Another idea is that Naruto is reborn in the High School DxD world as a half - dragon due to the influence of the Dragon God. He then has to navigate the complex social and power structures of the DxD world while also hiding his true identity at first. As he discovers more about his new powers and the world around him, he gradually becomes a key figure in the battles and politics of the DxD world.