Another option is Wattpad. While it may not have as many as the other two, there are still some interesting 'Destiny High School DxD Fanfiction' pieces on there. You might have to dig a bit deeper, but it can be worth it if you're really into this kind of fanfiction.
You can find 'Destiny High School DxD Fanfiction' on various fanfiction websites such as FanFiction.net. There are a lot of writers who post their works there. Just use the search bar and type in 'Destiny High School DxD' and you'll get a list of relevant fanfictions.
Archive of Our Own (AO3) is also a great place to look for it. It has a wide range of fanfictions, including those related to 'Destiny High School DxD'. The tagging system on AO3 makes it easy to filter and find exactly what you're looking for.
One great 'Destiny High School DxD Fanfiction' is 'The New Devil in School'. It has an interesting plot where the main character is a transfer student with a mysterious past. The story does a great job of integrating the Destiny elements into the High School DxD universe.
In a Naruto and High School DxD fanfiction, there could be a scenario where the protagonists of both stories meet in a neutral dimension. Issei from High School DxD might be intrigued by Naruto's ninja skills and determination. Naruto, in turn, could be curious about Issei's Sacred Gear. They could start training together, sharing their knowledge and skills, and ultimately have to face a common enemy that threatens both their worlds.
One possible fanfiction could be about Naruto characters somehow ending up in the world of High School DxD. Maybe Naruto's skills in combat and his determination would make him a formidable opponent in the battles that often occur in the High School DxD universe. He could form interesting alliances or rivalries with the characters there.
There could be. Fanfiction writers are known for their wild and creative ideas. Since both Naruto and High School DxD are popular series, someone may have written a fanfic where Naruto is presented as a god - like figure within the High School DxD universe. This could add an interesting twist to the story, perhaps bringing in Naruto's unique powers and abilities into the High School DxD world.
I really liked a fanfiction called 'Sona's New Strategy'. It shows Sona coming up with a brilliant new plan to deal with the various threats in the 'High School DxD' world. The author does a great job of portraying Sona's intelligence and her ability to adapt. There are some really cool plot twists that keep you hooked throughout the story.
There could be a really interesting fanfiction where the Queen of Blades from StarCraft gets inserted into the High School DxD universe. Maybe she could be a powerful new character in the school, causing all sorts of chaos or perhaps she teams up with the main characters to fight against a common enemy. It all depends on the creativity of the writer.
One possible scenario could be that Naruto characters are somehow transported to the world of High School DxD. Naruto's ninjutsu skills would be quite a shock to the devils and angels in that world. For example, Sasuke's Sharingan could give him an edge in battles against the supernatural beings in High School DxD. And Naruto's never - give - up attitude might inspire some of the characters there to face their challenges more bravely.
In a Naruto - High School DxD fanfiction, the power levels would be really interesting to explore. Naruto's sage mode and tailed - beast forms are extremely powerful. In the DxD world, there are different power systems like the Sacred Gears. It would be fascinating to see how Naruto's powers interact with the powers of the DxD characters. For example, could his Rasengan be enhanced by a Sacred Gear? Or how would he fare against a devil's magic?
It could also be due to the fact that some fanfiction might promote values that are not in line with the general community standards. For instance, if it contains excessive violence or promotes negative stereotypes, the platform or relevant authorities may decide to ban it to maintain a healthy and positive creative environment.
A fanfiction might explore how the power of the Excalibur in High School DxD would interact with Naruto's chakra. Since the Excalibur is a powerful holy weapon, it could have some interesting reactions when in the presence of Naruto's unique chakra, which is different from the magic in the High School DxD world. For example, it could either enhance or nullify certain abilities depending on how the author writes it.