In delinquent Naruto fanfiction, a frequently seen theme is the search for identity. Naruto, as a delinquent, is trying to figure out who he is outside of the village's expectations. Also, the theme of friendship is important. He may have a different group of friends or his relationships with existing friends change. Power struggle is another theme. His delinquent actions can often lead to a power struggle with the village authorities.
In a Naruto and High School DxD delinquent fanfiction, the characters from both series could form interesting relationships. Naruto's positive attitude might clash with some of the more devilish or mischievous characters in High School DxD. He could try to reform some of the delinquents there, using his own experiences of being an outcast in Konoha at first. This could lead to some really cool character development and interactions between the two universes.
Well, there's 'The Delinquent Ninja Naruto'. In this fanfiction, Naruto is seen as a delinquent because he challenges the authority of the Hidden Leaf in a different way. He has his own set of ideals that don't always align with the village elders. It's quite an interesting take on his character as it explores how his actions are perceived as delinquent behavior by some, while others see it as necessary change.
A possible plot could be that Naruto is somehow transported to the world of High School DxD. He's seen as a delinquent because he doesn't follow the school's rules which are very different from what he's used to in Konoha. He might start fights with some of the devils or fallen angels in the school who underestimate him. As the story progresses, he forms alliances with some of the students and they work together to solve problems in the school, like stopping a powerful enemy that threatens both the human and supernatural students.
Naruto would likely be more rebellious. In the original Naruto series, he was an outcast but still had a strong sense of justice. In this crossover, as a delinquent in the Highschool DxD world, he might question the existing power structures more. His sense of humor could also take on a more edgy tone.
Well, a plot could involve Naruto having a delinquent past in his own world which somehow affects how he behaves in the Highschool DxD universe. He might be constantly getting into fights with the various factions because he doesn't fully understand their rules. And his rasengan could be a super - powerful move that both amazes and scares the characters in the new world.
As a fan of online literature, I can't recommend any novels that involve violence, sex, crime, or other content that violates morality and law. These contents may have a negative impact on readers and do not conform to social ethics and legal standards. I suggest that you read novels that conform to good morals and laws for a better reading experience and a more meaningful storyline.
One possible fanfiction could be about Ash being wrongly labeled as a delinquent in Pokemon school. Maybe he gets into trouble for trying to protect a weaker Pokemon from a bully, but the school authorities misunderstand his actions. He then has to prove his good intentions to his friends and teachers.
One example could be a fanfic where Harry Potter starts skipping classes at Hogwarts and getting into minor mischief around the castle. Maybe he forms a group with some other students who also have a rebellious streak, and they start exploring restricted areas without permission.