Maybe in the fanfiction, the One Piece characters could gain some of the abilities from Naruto. For example, Luffy could learn how to use Rasengan. And the Hokage characters would have to adapt to the strange rules of the Grand Line in One Piece, like the different sea currents and islands with their own unique ecosystems.
Well, the chakra system in Naruto could potentially interact with the devil fruits in One Piece. For example, a character with a devil fruit power might be able to use chakra in a new way. The Hokage, being masters of chakra, could study the devil fruits and find a way to either replicate their powers or counter them. Maybe a Sharingan user could predict the movements of a Logia type devil fruit user better.
In a fanfiction where Naruto is a fishman in One Piece, Naruto would face new challenges. For example, dealing with the discrimination that some fishmen face in the One Piece world. But he'd also have new opportunities. He could use his fishman physiology to swim faster and deeper, discover hidden treasures, and maybe even find a way to connect the ninja world with the pirate world. His Nine - Tailed Fox chakra might also have some interesting interactions with the strange powers in One Piece.
Well, it depends on the specific fanfiction. Some fanfictions might explore alternate storylines where Naruto doesn't become the Hokage at all. Maybe he decides to pursue a different path in life, like focusing on being a teacher or an explorer. However, in a large number of fanfictions, he does achieve his goal of becoming the Hokage because it's such an iconic and desired outcome for fans who want to see his journey to the top in different ways.
It could be the First Hokage, Hashirama. Naruto would be amazed by his powerful Wood - Style jutsu and his ability to create the village. He could learn about the original ideals behind the Hidden Leaf from Hashirama.
In Naruto and One Piece fanfiction, ASL could refer to the initials of characters. For example, in One Piece, it could be related to Ace, Sabo and Luffy's relationship. Fanfiction writers might explore different scenarios with their bond, like creating new adventures before Ace's death. In Naruto, it could be used as a unique symbol or code among characters in an AU (alternate universe) story.
A Naruto - One Piece fanfiction could explore the differences in their power systems. While Naruto has chakra-based abilities, the pirates in One Piece rely on Haki, Devil Fruits, and physical strength. It would be fascinating to see how Naruto would interact with the various characters in the One Piece universe. For example, how would he get along with Zoro, the swordsman? Or how would he deal with the wily Nami when it comes to treasure? There are so many possibilities for an exciting and unique story.
His friends like Sakura and Shikamaru would surely support him. Sakura, with her medical skills, could be an important part of his regime, providing healthcare for the ninjas. Shikamaru, being intelligent, could offer strategic advice. Also, the younger generation of ninjas who have been inspired by Naruto would be his strong supporters, as they believe in his leadership and the new direction he could take the village in.
Sasuke could be an alternative. He has strong ninja skills and a deep understanding of the ninja world. His experiences have made him grow into a very capable person, and his Sharingan gives him an edge in combat and strategic planning.
Naruto could fit in by using his physical abilities. His superhuman strength, speed, and endurance, which he developed through his ninja training, would make him a formidable opponent in the One Piece world. He could easily take on weaker pirates or even some of the lower - level Marines.