In many fanfictions, Sasuke is often portrayed as a transfer student. His mysterious past and unique powers make him an object of curiosity among the students in the Highschool DxD universe. He may form alliances or rivalries with the different factions like the devils, angels, and fallen angels. His ninja training also allows him to approach the challenges in this universe in a different way compared to the native characters. He might use stealth and assassination techniques that are not common in the DxD world.
Sasuke's personality also plays a role in his integration. His brooding and somewhat anti - social nature can create interesting dynamics. He may initially be aloof from the social structures in the Highschool DxD world, but as the story progresses, he could find himself drawn into the various power struggles and relationships. His desire for power and self - improvement can also be a driving factor in how he interacts with the opportunities and threats in the DxD universe.
Sasuke can fit in as a powerful outsider. His skills and abilities make him a force to be reckoned with. For example, his Sharingan can give him an edge in combat and in detecting hidden motives of characters in the DxD world.
The OC, as the Son of Sparda, could fit in by being a new and powerful entity. He might be initially seen as an outsider, but his powers would quickly draw attention. He could become involved in the power struggles between the different factions in Highschool DxD. For example, the devils might try to recruit him, while the angels might be wary of his presence. His unique abilities would also make him a valuable ally or a fearsome opponent. And in the high school setting, he could be a bit of an enigma to the other students, both human and supernatural.
Saber could fit in as a powerful ally. Her noble phantasms and combat abilities would make her a force to be reckoned with. In a world full of supernatural beings like Highschool DxD, she would be another strong addition. She might be seen as a sort of mysterious figure that both the devils and the angels would be curious about.
He could fit in as a new type of supernatural being. Since he has god - like powers, he might be seen as a threat at first. But then, as the story progresses, he could form alliances. For example, he could team up with the devils against a common enemy. His abilities like instant teleportation (using techniques like Flying Thunder God) would be very useful in the battles in the Highschool DxD universe.
Goku would fit in as a super - powerful outsider. His physical strength and combat skills are far beyond what the normal characters in Highschool DxD are used to. He could become a sort of protector for the school, using his powers to fend off any threats that come their way. His energy - sensing ability would give him an edge in detecting hidden enemies.
These fanfictions expand the Highschool DxD universe by introducing new characters like male Nekoshou. For example, they can create new storylines around their powers and how they interact with the existing characters in the DxD world. It might be a male Nekoshou with a special ability that changes the power dynamics in the school.
Naruto's abilities would bring a whole new dynamic to the Highschool DxD universe. His ability to use chakra to walk on walls and water could give him an advantage in certain terrains or situations. In battles, his ability to sense chakra could help him detect hidden enemies. Also, his summoning jutsu could call upon powerful creatures from the Naruto universe. If these creatures were introduced into the Highschool DxD world, they could change the balance of power. And his various transformation jutsu could be used for disguise or to gain temporary boosts in power.
He would fit in as a unique and powerful character. His abilities would make him a force to be reckoned with. He could use his speed and strength to compete with the devils and other supernatural beings in the DxD world.
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.
He could fit as a powerful outsider. His power level is extremely high with Mugetsu, so he'd be a force to be reckoned with. Maybe he'd be seen as a wildcard by the different groups in DxD.
Naruto Otsutsuki could fit into the High School DxD universe by being a new and powerful entity. His abilities would be a significant addition. For instance, his transformation abilities like the Nine - Tailed Fox form could make him a force to be reckoned with among the devils, angels, and fallen angels in the DxD world.