Danzo could be a great antagonist in this 'naruto highschool au fanfiction'. He could be the strict school principal who enforces very strict rules and has a hidden agenda. He might not like Naruto's free - spirited nature and try to expel him. Also, Kabuto could be a student who is under Danzo's influence and causes trouble for Naruto and his friends.
Well, one interesting concept could be the combination of the unique powers from One Piece and the supernatural elements of Highschool DxD. For example, a character with a Devil Fruit ability attending the high school in the Highschool DxD universe and having to deal with both the challenges of that school like the Rating Games and also the threats from the One Piece world such as the World Government or pirates.
One idea could be Naruto being the class clown who is secretly a really talented artist. Another could be a love triangle between Naruto, Sasuke and Sakura in high school, with Naruto trying to win Sakura's heart while Sasuke is the brooding, mysterious rival. Maybe there's a big school competition and Naruto has to lead his team to victory against all odds.
A cool plot could be that the Highschool DxD characters are transported to the One Piece world. Issei, being the perverted yet brave character he is, might be really excited to see all the different female characters in One Piece. But he also realizes that they are in a dangerous world. Meanwhile, the One Piece characters are baffled by the strange powers and personalities of the Highschool DxD crew. They all have to work together to face the various pirates and threats in the One Piece world.
I think Moon could be a great main character. She's independent and strong - willed. In the high school au, she could be the one who challenges the traditional Pokémon training methods at school. Then there's Sun, who could be her rival or partner, depending on how the story goes. There could also be some original characters created specifically for this fanfiction. For example, a new student from a far - off region who has unique Pokémon from places not seen in the original Sun and Moon games, adding a fresh perspective to the high school's Pokémon scene.
One way is to have the Devil Fruits play a major role. Imagine a character in the Highschool DxD world who has eaten a Devil Fruit and has to hide it from others while also using its powers to gain an edge in the Rating Games or in battles against other supernatural beings. For example, a Logia - type Devil Fruit user could transform into an element to avoid attacks during a fight in the schoolyard.
One idea could be that the main character is a new student at the high school in the Alola region. They discover a secret Pokémon club where students train their Pokémon for unique battles. Another could be a story about a rivalry between two students over who will be the top Pokémon trainer in the school. Maybe one has a team of Sun - based Pokémon and the other of Moon - based Pokémon.
The final chapter of One Piece was the final chapter of One Piece, a manga by Oda Shuichiro. The story took place on the stone island at the end of the world. Luffy and his companions fought fiercely in search of the legendary One Piece treasure and finally defeated all the enemies to realize their dreams.
At the end of the story, Luffy and his companions finally arrived at the legendary location of One Piece's treasure, the New World. However, they found that the treasure had been guarded by a place called Demon Island. On Demon Island, Luffy and his companions faced more dangerous tests, but they persevered and finally defeated all the guardians of Demon Island and obtained the treasure.
At the end of the story, Luffy and his companions finally returned to their hometown, the hometown of "One Piece Island" Monchi D. Luffy, and began a new journey.
Luffy and Issei would be an interesting pair. Luffy's carefree and fearless nature combined with Issei's determination and his unique Sacred Gear abilities could lead to some really fun and action - packed scenes. They could learn from each other, like Luffy teaching Issei about his unwavering belief in his dreams and Issei showing Luffy some of the more strategic ways to use powers in the Highschool DxD world.