Yes, there are likely fanfictions out there with such a concept. In the 'Highschool DxD' universe, there are so many creative interpretations by fans. Some fanfiction writers might explore the idea of Issei taking on a Satan - like role for various reasons, perhaps to add a new twist to the story, explore different power dynamics, or to create unique character relationships.
A plotline might involve Issei as Satan trying to reform the devil society. He could use his unique perspective as a former human to change the way devils operate, such as their treatment of the weak or their approach to making contracts. This could lead to a lot of internal conflict within the devil world as traditionalists oppose his new ideas. And his friends from different races like Rias and the others might be caught in the middle, not sure whether to support him fully or try to temper his more radical changes.
One idea could be that Naruto is somehow transported to the world of Highschool DxD. He could use his ninja skills and chakra in the new world, maybe even teach some of the characters there a thing or two about combat. For example, he could show Issei how to better control his power using chakra control techniques.
The storylines can be combined by creating a common threat. Suppose an enemy emerges that is interested in both the power of the Bijuu and the power sources in Highschool DxD. This would force the characters from both universes to team up. Also, the cultural differences between the Naruto world and the Highschool DxD world can be explored. Naruto could introduce concepts like ninja clans and shinobi training to the DxD characters, while they could introduce him to the complex social hierarchies and supernatural politics in their world.
To create an interesting Highschool DxD OC Satan for fanfiction, start with their appearance. You can give them a look that is both menacing and alluring, like having dark, flowing hair and glowing red eyes with a unique symbol on their forehead. Then, think about their motives. Are they trying to take over the underworld? Or are they more interested in co - existing with the other characters? Also, their relationships are important. Maybe they have a long - lost sibling in the Highschool DxD world that they are trying to find. All these elements combined will make the OC Satan more engaging.
Well, in Highschool DxD OC Satan fanfiction, identity crisis is a theme. The OC Satan has to figure out who they are in the context of the existing Satanic hierarchy in the series. Also, friendship can be a theme. They might form unexpected friendships with the main characters of Highschool DxD. This can lead to situations where the OC Satan has to choose between their own kind and their new friends. Another theme is the exploration of different powers. The OC Satan could have unique abilities that are explored throughout the story, and how they use these powers for good or bad is often part of the plot.
The female characters from Highschool DxD, like Rias, would be intrigued by the unique personalities of the Naruto characters. Rias might see potential in some of them to join her peerage. And the Naruto girls, like Sakura, would be a bit shocked at first by the more revealing outfits and flirty nature of some of the Highschool DxD characters. But over time, they would bond over things like protecting their friends and the school. The Naruto boys would respect the power of the Highschool DxD devils and might even try to incorporate some of their fighting strategies into their own ninja combat styles.
In a Sharingan Naruto Highschool DxD fanfiction, the Sharingan could also play a role in terms of illusions. Imagine a scenario where the character uses Sharingan - based illusions to deceive the enemies from both worlds. They could make a Highschool DxD devil believe they are in a completely different environment like a dangerous Naruto - style forest filled with traps. And for Naruto characters, they could be made to see illusions of their worst nightmares or false threats from the Highschool DxD world, which would make for some really intense and engaging storylines.
A fanfiction idea could be that Lucifer from the Highschool DxD universe somehow ends up in the Naruto world. In the Naruto world, he could be seen as a powerful and mysterious figure. He might interact with the ninja clans and shinobi, and his powers could be both feared and respected. He could also have some kind of connection with the tailed beasts or the Sage of Six Paths. The story could revolve around how his presence disrupts or changes the balance of power in the Naruto world.
The appeal lies in the mash - up of different elements. It's like a buffet of cool concepts. You get the action - packed ninja world of Naruto, the unique sword powers of Zanpakuto, and the supernatural high school setting of Highschool DxD. It's a chance to see your favorite characters in new and unexpected situations.