In a 'Naruto x Gabriel Highschool DxD' fanfiction, the plot could revolve around Naruto being summoned to the Highschool DxD world by some mysterious force related to Gabriel. Gabriel, being an angel, is interested in Naruto's chakra and the concept of ninjutsu. They start to train together, with Naruto teaching Gabriel some basic ninjutsu moves and Gabriel teaching Naruto about the different types of supernatural powers in her world. However, their training is interrupted when a group of rogue demons attacks the school. Naruto and Gabriel then have to put their newly learned skills to the test and protect the school and its students. This could lead to a series of battles and character development for both Naruto and Gabriel as they learn from each other and grow stronger together.
One possible plot could be that Naruto is somehow transported to the Highschool DxD universe and meets Gabriel. They might team up to face a common threat that is endangering both the ninja world and the supernatural world of Highschool DxD. Naruto's unique skills as a ninja could be combined with Gabriel's angelic powers in an epic battle against evil forces.
Well, perhaps in this fanfiction, Naruto enrolls in the high school in the DxD universe. He befriends Gabriel who is initially intrigued by his strange powers. As they get to know each other better, they discover a conspiracy within the school that involves some dark magic users trying to take over. Naruto, with his experience in fighting villains in his own world, and Gabriel, with her knowledge of the supernatural in her world, work together to stop it. For example, Naruto could use his shadow clone jutsu to gather information while Gabriel uses her angelic senses to detect the source of the dark magic.
Perhaps Naruto is mistaken for a powerful devil or an unknown being in the DxD universe. Gabriel, being curious, approaches him. They start off on a rocky relationship as Naruto is confused by this new world. But as they get to know each other, they find out that their powers can be combined in unique ways. For example, Naruto's shadow clone jutsu combined with Gabriel's holy powers could create some really cool and unexpected attacks against their foes.
One possible fanfiction could be about a crossover where the characters from Highschool DxD and Naruto are transported to a world where they meet Gabriel. Maybe they team up to fight a common enemy. For example, the devils from Highschool DxD and the ninjas from Naruto could combine their powers under Gabriel's guidance to defeat an ancient evil that threatens all three of their realms.
Well, the plot could involve Harry being a new transfer student to the Highschool DxD world and Gabriel being one of the first to befriend him. Maybe they team up to face some of the common threats in that universe, like the devils or fallen angels. They could also explore their own unique powers together and learn from each other.
Well, in a 'Naruto x Greyfia Highschool DxD' fanfiction, perhaps Naruto is a new transfer student in the Highschool DxD. Greyfia could be a popular student there. Naruto's positive and energetic attitude might attract Greyfia's attention. They could start off as friends and gradually develop a deeper relationship. Maybe they get involved in the supernatural battles of the DxD world together, with Naruto using his Rasengan and other jutsu while Greyfia uses her demonic powers. And as they spend more time together, they learn from each other's worlds and values.
One possible plot could be that Naruto, with his godlike powers, ends up in the world of Highschool DxD. He might join the Occult Research Club and use his unique abilities to protect the club from various threats. His ninja skills and super - powered jutsus could be a huge asset in battles against devils, fallen angels, and other supernatural foes.
Another idea is that a powerful artifact has been stolen and its pieces are scattered across the three worlds. Naruto, Gabriel, and the Highschool DxD characters must team up to find all the pieces. As they search, they encounter different challenges in each world. In Naruto's world, they face ninja clans who want the artifact for their own power. In Gabriel's world, they must deal with angelic politics. And in the Highschool DxD world, they have to fight off demons who also want the artifact.
One idea could be a tournament - style plot. Characters from all three universes are invited to a grand tournament. Naruto's ninjas, the devils from Highschool DxD, and Gabriel's angelic forces compete against each other in various challenges. This would showcase the different fighting styles and powers of each group.
Maybe an evil sorcerer who has mastered both dark magic and some forbidden ninja techniques. He plans to use the chaos that would ensue from merging the two worlds to his advantage. He would be against Naruto and Gabriel because they stand in the way of his evil plans. He could start by creating unrest in the Highschool DxD world, pitting different factions against each other, and then try to use Naruto's presence as a scapegoat. Gabriel, being an angel of justice, would naturally oppose him, and Naruto, with his sense of loyalty and protecting others, would join her in the fight.
One popular plot idea could be the OC being a new student at the school and catching Gabriel's attention. Maybe the OC has a unique power or ability that Gabriel is intrigued by. Another idea is a story where the OC is in some sort of danger and Gabriel has to protect them. This could lead to a deeper connection between them as they face challenges together.
One possible plot could be Naruto being somehow transported to the world of Highschool DxD. He could use his ninja skills and chakra in the battles against the devils and fallen angels in that world. Maybe he teams up with Issei and his group, and Naruto's unique jutsus like Rasengan and Shadow Clone Jutsu surprise everyone.