Another good one could be 'Highschool DxD: The Naruto Influence'. In this fanfiction, the author manages to blend the storylines in a way that makes it seem like Naruto has always been a part of the Highschool DxD world. His presence changes the relationships between the characters in a fascinating way.
There's also 'Naruto's Adventure in Highschool DxD'. This fanfiction stands out because it not only has great action scenes but also delves into the cultural differences between the two worlds. Naruto's values from his ninja upbringing often clash and then merge with the values of the Highschool DxD characters, creating a really engaging read.
There's a fanfiction where Naruto is transported to the Highschool DxD world and is initially neglected due to his different upbringing. In this story, he gradually forms alliances with some of the outcast characters in the DxD world. They, together, start to change the power dynamics. It shows how Naruto's values from his own world can have an impact in a new and different setting like Highschool DxD.
Common themes often include crossovers of the school settings. In Highschool DxD, the school is a major part of the story, and in Naruto, there are ninja academies. Writers may blend these two school - related concepts. Also, themes related to friendship and rivalry can be common, as characters from both universes come together, and Shinju might be a factor that affects these relationships. For example, characters might compete over Shinju or form alliances because of it.
One plot idea could be Koneko adjusting to the high school life which is a mix of Naruto and Highschool DxD elements. For example, she might have to deal with different types of jutsus in the school setting as well as the devilish powers from Highschool DxD. Another could be her forming an unexpected friendship with a Naruto character, like Naruto himself, and they learn from each other's powers and cultures.
One interesting 'Highschool DxD Tiamat' fanfiction could be the ones that explore Tiamat's character in the context of the Highschool DxD universe. For example, some fanfictions might focus on her relationships with other characters like Issei. They could show how she adapts to the school environment and the chaos that often ensues in the Highschool DxD world. Another aspect could be fanfictions that delve into her powers and how they are perceived and used within the story. Maybe she uses her powers to protect the school or to help a particular character achieve their goals.
One interesting Azazel fanfiction could be one where he mentors the main character in a more in - depth way, exploring his knowledge and skills. For example, a story where he takes the protagonist on a journey through different dimensions to teach about the various supernatural elements in the Highschool DxD universe.
Another interesting one could be 'Sasuke and the Occult Research Club'. This fanfiction might involve Sasuke getting involved with the club's activities. His knowledge of ninjutsu and his experience with the supernatural in his own world could bring a fresh perspective to the club's investigations and battles against the forces of evil in the DxD world.
One popular 'Highschool DxD' fanfiction could be those that explore different character backstories in more depth. For example, fanfictions about Issei's training before he became a powerful devil. They often add new twists to the original story, like introducing new characters that interact uniquely with the main cast.
One interesting Shirou Highschool DxD fanfiction could be one where Shirou uses his swordsmanship skills from his original story in the Highschool DxD universe to fight in the Rating Games. This would bring a new dynamic as his unique combat style would contrast with the magic - based fighting in Highschool DxD.
One highly recommended fanfiction is 'Naruto: The Shinobi of Kuoh Academy'. It has an interesting plot that combines the elements of Naruto and DxD really well. The character development is also quite engaging.
One great 'Highschool DxD Godlike Issei' fanfiction could be 'Issei's Ascent'. It often features Issei achieving new levels of power in really cool and unexpected ways. Another is 'Godlike Issei: New Beginnings' which focuses on Issei making different choices early on in the story that lead to a whole new set of adventures. And 'The Godlike Issei's Realm' is also popular as it delves into Issei creating his own unique realm with his newfound powers.