If Naruto had Kyuubi's power in the High School DxD universe, things would be chaotic at first. His presence would be a shock to the different factions. The devils would likely try to either recruit him or eliminate him. But Naruto, with his strong will and Kyuubi's power, could form new alliances. He could teach the students at the school some of his ninja ways and in turn learn about the magic and powers in that world. His Kyuubi - enhanced abilities would make him a formidable opponent in the Rating Games.
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.
He could form a mentor - like relationship with some of the younger characters in High School DxD. His experience and power could help them grow. Also, he might have an uneasy alliance with the devils, as they could be interested in his power. Maybe a friendly rivalry with some of the more powerful angels.
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.
He could be seen as a mysterious figure at first. Given his different appearance and abilities compared to the devils, angels, and fallen angels in the DxD world. Naruto might initially be a target of suspicion, but as he shows his good heart and helps out in various situations, like protecting the school from an attack, he would gradually be accepted. He could also have some interesting interactions with the magic and power systems in the DxD universe, maybe even finding a way to combine his chakra with their powers.
Naruto could fit in as a new transfer student in the High School DxD universe. His out - of - this - world ninja skills would make him stand out immediately. He might initially be confused by the supernatural elements but would quickly adapt and use his skills to protect the school or his new friends from any threats.
Well, the story could start with Naruto and Fem Kyuubi being transferred to the High School DxD school. Naruto might struggle to adapt to the different rules and social hierarchy there. The Fem Kyuubi, on the other hand, could use her charm and wits to navigate through the new environment. Their relationship could evolve as they face challenges together, like dealing with the various factions in the school.
In the High School DxD universe, Naruto's chakra might be seen as a new form of energy. His Sage Mode would give him enhanced senses and strength. He could detect the presence of devils and angels from afar. When using Sage Mode, his attacks would be even more powerful. For example, a Sage Mode - enhanced Rasengan could cause massive damage to the toughest of opponents in the DxD world.
If Naruto were born in the High School DxD fanfiction universe, there would be a lot of potential storylines. Naruto's Uzumaki heritage could give him an edge in a world full of different supernatural beings. His ability to make friends and his sense of justice would likely lead him to get involved in the various conflicts in the DxD world. He could also introduce the concept of ninjutsu to this world. His training methods might be adopted by some of the characters there, and he could even start his own ninja - themed group within the DxD setting.
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.
Naruto could fit in as a new transfer student in the school from the Naruto world. He'd bring his unique ninja skills and his never - give - up attitude. His Rasengan could be a powerful new move in the battles against the various supernatural foes in the DxD world.