One way it could develop is if Naruto's ninja training and values from his world conflict with the more flirty and forward nature of the female demons in High School DxD. He might see their behavior as inappropriate or untrustworthy, which would fuel his 'hates women' stance.
It could be that Naruto has some bad encounters with women in the High School DxD world right from the start. For example, if some female characters play tricks on him or try to use him for their own gains, he might start to dislike them.
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.
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.
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.
Well, it could be that Naruto, as a Nephilim, enters the High School DxD world. He might use his ninja skills along with his new Nephilim powers. Maybe he has to deal with the devils and angels in the school setting, while also trying to keep his identity a secret. He could form new alliances and rivalries within the school, all while facing challenges that are unique to this crossover world.
Perhaps in this fanfiction, Naruto and Kushina are reincarnated in the High School DxD world. They have to adapt to the new school life there. Naruto would surely stand out with his determination and fighting abilities. Kushina would be a motherly figure to some of the students who lack that kind of support. They both could change the balance of power between the different factions in the world.
The plot might develop with Naruto having to adjust to the new rules of the 'High School of the Dead' world while also dealing with the harem situation. Maybe some of the harem members have their own special skills, like one could be good at first - aid. Naruto would team up with them, using his combat skills and their knowledge to keep the group alive. As for the harem, Naruto's positive attitude towards everyone could lead to some jealousy among the female characters, creating interesting relationship dynamics.
Well, one way the storyline could develop is that Evil Naruto would likely disrupt the power balance in the High School DxD world. He might use his dark powers to challenge the existing factions. For example, he could target the devils and their hierarchy. His abilities, like shadow clones and powerful jutsus, would be a huge threat. He might also form his own group of followers, consisting of those who are attracted to his power or share his evil ideology.
One possible plot could be that Naruto and Hinata are transferred to the High School DxD world. Naruto's powerful ninja skills might make him stand out, while Hinata's shy yet strong - willed nature could attract different reactions. Maybe they have to face the devils and angels in this new world together, with Naruto using his Rasengan and Hinata her Gentle Fist techniques to protect their new friends and find a way back to their own world.
One possible plot could be that Naruto, who is now half - youkai, gets transferred to the High School DxD world. He has to hide his true identity at first but then gets involved in the power struggles between the different factions. Maybe he uses his ninjutsu and new - found youkai powers to protect his friends and the school from a common enemy.