In the fanfiction, Naruto might be seen as a hero figure. Given his experience in saving his own world, he could take on the role of protecting the Highschool DxD world from a new threat. His Rasengan and other powerful jutsus could be used against enemies that the regular characters in Highschool DxD might have trouble dealing with. He could also teach some of the students his ninja way, influencing the way they think about power and friendship.
He could be a sort of outsider who comes in and shakes up the status quo. Naruto's unique powers would make him a force to be reckoned with. He might initially be confused by the different rules and power systems in Highschool DxD but quickly adapt. For example, he could use his shadow clones to gather information about the different groups and their motives. And his positive attitude could inspire some of the characters in the Highschool DxD universe to change their ways.
She might be a mediator between different factions. Since she has experience dealing with different groups in the Naruto world, she could try to bring peace between the devils, angels, and other races in the DxD world. Also, her unique sense of justice could influence the characters in DxD to be more morally upright.
Naruto could be a disruptor of the status quo. In the Highschool DxD world, there are set power structures and politics. Naruto, with his straightforward and often naive view of right and wrong, would likely not abide by some of the more underhanded practices. He'd probably be a force for good, using his ninja skills and Kurama - enhanced power to protect the weak.
Naruto could be a game - changer. He'd likely become a powerful fighter. His rasengan and other jutsu would be very effective against the enemies in the DxD world. Maybe he'd be seen as a new type of supernatural being due to his chakra. He might also use his ninja stealth to gather information about the various factions, which could be crucial in preventing wars between them.
God Ichigo could be a game - changer in a Highschool DxD fanfiction. He might act as a mediator between the different factions. Given his experience with different types of spiritual beings in the Bleach universe, he could bring a new perspective to the ongoing conflicts in DxD. For example, he could try to stop the senseless fighting between the devils and angels, which is a common theme in DxD.
Genesis could be a rival. He might compete with the main characters for power or the affection of certain characters. His competitive nature and his desire to prove himself would make him a formidable rival. He could also have his own group of followers or allies within the school, creating a new faction that the main characters have to deal with.
In the school in Highschool DxD fanfiction, Superman could be a protector. He would use his powers to keep the students safe from any threats, whether they are from the supernatural world or just normal human dangers like a fire or a bully. He might also be a role model for the students, showing them what it means to have a strong moral compass.
In this fanfiction, Shirou might be seen as an enigma. His calm and collected demeanor would be different from the more boisterous characters in Highschool DxD. He could potentially be a mediator between the different groups, given his own experiences with complex moral situations in the Fate series.
Ichigo could be a game - changer. His Hollow - like powers might be mistaken for some sort of demonic or otherworldly ability in the Highschool DxD setting. This could lead to both misunderstandings and interesting interactions with the characters there.
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.
Naruto's development could be centered around his ability to adapt to a new culture. The Highschool DxD world has its own set of rules, ethics, and social norms. He would need to learn and respect these while still maintaining his own identity. His sense of justice might also be challenged as he realizes that the good - bad divide in Highschool DxD isn't as clear - cut as in his own world. This could lead to him re - evaluating his beliefs and growing as a character.