Fanfiction Ideas Combining Ben 10 and Highschool DxD

A more complex fanfiction could be about a joint mission between the two universes. The leaders of both worlds realize that there is a common threat that only the combined forces of Highschool DxD and Naruto can defeat. So, they send their best characters, like Rias and Sasuke, to work together. This would involve a lot of character development as they learn about each other's cultures and powers.

A story could also revolve around a quest that involves both Diablo and Highschool DxD elements. The characters from both universes could team up to find a powerful artifact that has significance in both worlds. They would need to overcome their differences and work together, with the devils and angels from Highschool DxD learning about the dark and dangerous forces from Diablo.

One idea could be a crossover where Naruto characters are transported to the world of The Highschool of DxD. For example, Naruto himself could end up at the high school and his ninja skills would be quite a shock to the devils and other beings there. He might get involved in the Rating Games, using his shadow clones and other jutsu to his advantage.

One idea could be a crossover where the protagonist from DarkSiders ends up in the world of Highschool DxD. Maybe he has to navigate the complex social and supernatural hierarchies there while also trying to find a way back to his own world. He could bring his unique combat skills and abilities from DarkSiders and use them in the battles that often break out in the Highschool DxD universe.

A fanfiction could focus on Ichigo attending the school in Highschool DxD. His presence would surely disrupt the normal balance. He might not be interested in the whole 'devil' and 'angel' thing at first, but gradually get involved. He could also introduce some of his Soul Reaper training methods to the students there, which would be very different from what they're used to.

One idea could be a crossover where Naruto characters end up in the world of Highschool DxD. For example, Naruto himself could be transferred to the school in Highschool DxD. He might use his ninja skills in the battles against the devils and fallen angels there. His shadow clone jutsu could really surprise the characters in the Highschool DxD world.

One idea could be that Naruto, with his godlike powers, somehow ends up in the world of Highschool DxD. He meets Lucifer and they initially have a clash due to misunderstandings. Naruto's power might surprise Lucifer and his followers. As the story progresses, they could find common ground and team up against a greater threat that endangers both Naruto's world and the Highschool DxD universe.

One idea could be a crossover where a character from Harry Potter, say a young wizard, accidentally gets transported to the world of Highschool DxD. He then finds himself in the middle of the harem situation that is common in Highschool DxD. Maybe he uses his magic in unexpected ways in this new world.

One idea could be to have the characters from Dragon Ball Z attend the school in Highschool DxD. For example, Goku could be a transfer student with his incredible power causing quite a stir among the devils, angels and fallen angels. He might be confused by the different social dynamics and the whole concept of the supernatural school setting.

One idea could be a crossover where Ben Tennyson ends up in the Young Justice universe. He could team up with the young heroes to fight a common enemy. Maybe a group of villains from both universes join forces, and Ben uses his Omnitrix to transform into different aliens to help in the battles.