The character could be a catalyst for change. The EMS gives them access to powerful abilities. In the High School DxD world, which is often about power struggles and hierarchies, their presence could disrupt the status quo. They might inspire other characters to strive for greater power or to question the existing power structures. For example, if they use their EMS to defeat a powerful devil who has been oppressing others, it could start a movement among the weaker characters to stand up for themselves.
The EMS in Naruto has the potential to add a whole new dimension to High School DxD fanfiction. Since EMS gives enhanced visual abilities and powerful jutsu in Naruto, in the DxD setting, it could be used to detect hidden enemies or sacred gears. A character with EMS might be seen as an anomaly in the DxD world, and their power could either be feared or revered. They could use it to analyze the weaknesses of their opponents, whether they are devils, angels, or other mythical creatures. And the EMS - related powers could also lead to interesting storylines, like the character being hunted by certain factions who want to study or steal this unique power.
One way could be through the power system. The EMS (Eternal Mangekyou Sharingan) from Naruto could be a unique power that a character in the High School DxD world acquires. Maybe a transfer student from a hidden ninja village arrives at the high school and has to keep their EMS a secret while dealing with the devils and angels in the school. This could lead to some interesting battles and interactions as the powers of the EMS, like the ability to use powerful jutsus, contrast with the magic and abilities of the High School DxD characters.
One creative crossover could be a story where Naruto characters with EMS are reincarnated into the High School DxD world. They have to use their EMS powers to navigate the complex social and power structures there. Another could be a world where the power of EMS is combined with the Sacred Gears in DxD, creating a whole new set of abilities. Maybe a character has an EMS - powered Sacred Gear that gives them super - enhanced vision and the ability to use Sharingan - like techniques in battles against devils and angels.
His role could be that of a protector. Given his nature of protecting his friends in the Naruto series, he would likely do the same in the High School DxD world. He could protect Fem Kyuubi from those who might want to take advantage of her power. Also, he could be a bridge between the different species in the school, using his understanding of different types of people from his own world.
Dark Naruto in a High School DxD fanfiction would be a complex character. He would carry the trauma and power-hungry tendencies from his Naruto backstory. In the DxD world, this could manifest as a drive to become stronger, not just physically but also in terms of influence. He might be initially distrusted due to his dark nature, but his loyalty and determination could win over some of the characters. He could be a wildcard, not fully aligning with the devils, angels, or the other factions, and always looking out for his own interests while also having a sense of justice that is unique to him.
Firebrand could be a student in the High School DxD setting who has a strange connection to the Naruto world. Maybe they have dreams or visions of the Naruto world and start to develop ninja - like abilities in the High School DxD world. This could lead to them being an outcast at first, but as they grow in power, they become a key figure in protecting the school from threats that are both from the High School DxD universe and potentially threats that have some connection to the Naruto world.
A 'Naruto in High School DxD' fanfiction could involve Naruto being transferred to the DxD school. He would stand out immediately with his orange jumpsuit. His Rasengan could be a very powerful move against the devils and angels in that universe. And his sense of justice would likely lead him to get involved in all the power struggles and protect the weak, just like he did in his own world.
Well, he could be a powerful antagonist. His skills and power from the Dragon Ball universe would make him a formidable foe in the High School DxD world. He might be interested in the power of the devils and angels there and try to take it for himself.
Goku Black might become a sort of anti - hero. He has his own sense of justice (albeit a twisted one in his original story). In the High School DxD world, he could oppose some of the more corrupt elements of the different factions while also causing trouble for the main characters as they try to figure out his motives. For instance, he could see the way some devils treat humans in the DxD world and decide to take matters into his own hands, but not in a way that the main characters would necessarily approve of at first.
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.