Well, in this fanfiction, the Straw Hats might be in need of a powerful ally. They meet Hancock, and she is instantly drawn to Luffy. The crew could then face a common enemy that is threatening both Amazon Lily and their own goals. Hancock decides to join forces with the Straw Hats. Sanji would be over the moon to have Hancock around, but also a bit jealous of Luffy's special connection with her. And Zoro would be his usual stoic self, just glad to have extra muscle for the upcoming battles.
In a 'Straw Hats meet Hancock' fanfiction, the story could start with the Straw Hats getting lost and accidentally landing on Amazon Lily. Hancock, seeing Luffy again, is filled with mixed emotions. The Straw Hats are curious about the unique culture of Amazon Lily. Hancock might introduce them to the secrets of her devil fruit powers. As they interact, there could be humorous moments, like Usopp trying to impress the Amazon women with his gadgets. Nami might try to trade with the Amazons, while Chopper is fascinated by the local flora and fauna. Eventually, they all realize they can benefit from each other's skills and knowledge and form an alliance for future adventures.
Luffy could be the main character. Since Hancock has a special connection with him, the story could revolve around Luffy's interactions with Hancock and how he manages to get the Straw Hats and Hancock's people to work together.
If Naruto was raised by the Straw Hats, he'd probably be a very different person. He might be more carefree like Luffy. For example, he'd be used to the wacky adventures on the Grand Line. His ninja skills could blend with the pirates' combat styles, creating some really unique fighting techniques.
In such a fanfiction, the plot could involve Robin being a young prodigy. Maybe she initially has some secrets that she's hesitant to share with the Straw Hats. For example, she might be on the run from some powerful organization that wants to use her knowledge for evil. As she joins the Straw Hats, she slowly starts to trust them more and more. She could use her intelligence to help the crew out of tricky situations, like deciphering ancient maps or understanding the language of long - lost civilizations. And along the way, she forms deep bonds with each member, especially Luffy who accepts her without hesitation, which gives her a sense of belonging she's never had before.
If Smoker joins the Straw Hats in fanfiction, the development might be slow. At first, he would struggle to fit in with their laid - back and often rule - breaking ways. But his sense of justice could lead him to find common ground. For example, he might see that the Straw Hats are fighting against corrupt forces, just in a different way than the Marines. As the story progresses, his character could evolve. He might start to see the world from the Straw Hats' perspective and become more accepting of their methods. This would not only change him but also affect how the Straw Hats view the Marines in general.
One possibility is that they gain a deeper understanding of Luffy's motives. For example, they might see his memories of making the promise to Shanks and realize how important it is for him to become the Pirate King. This could strengthen their resolve to support him even more.
I really like the fanfiction where the Straw Hats time travel to the future. In this story, they see how their actions have affected the world in the long run. It shows a post - apocalyptic world that was caused by a series of events that they were unknowingly a part of. It makes them reflect on their current actions and how they can change things for the better. Another good one is the one where they go back to the time of Gol D. Roger. They get to meet the legendary pirate and learn some of his secrets, which is really exciting for fans of the series.
In a fanfiction where Smoker joins the Straw Hats, it could be really interesting. Smoker is a marine, and his sense of justice is quite different from the Straw Hats' view of freedom. At first, there would likely be a lot of tension. But as time goes on, he might start to understand their way of life. For example, he could see how they help the weak and oppressed in their own unorthodox way. He might also learn to be more flexible in his views of right and wrong, as the Straw Hats often operate outside the normal rules. And his combat skills would be a great addition to the crew, making them even more formidable in battles against stronger enemies.
In a fanfiction where Naruto joins the Straw Hats, the dynamic of the crew would change significantly. Naruto is used to working in teams in his own world, and his experience in forming strong bonds with his comrades would blend well with the Straw Hats' own sense of camaraderie. His ability to make friends easily would also help him fit right in. Plus, his shadow clone jutsu could be used for various tasks on the ship, like helping with repairs or keeping watch.
His personality would become more outgoing and adventurous. The Straw Hats' lifestyle is full of exploration, so Naruto would be more eager to take risks.
Well, he would probably make the Straw Hats extremely powerful. His ninja skills like shadow clones and rasengan could be used in creative ways during battles at sea. For example, he could use shadow clones to man the ship while the others fight or use rasengan to blast away powerful sea monsters.