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.
She would likely become more open. At first, young Robin might be reserved due to her past experiences. But as she spends time with the Straw Hats, she'll start to share more about herself. For example, she could gradually open up about her family and her dreams for the future. Her confidence would also grow. The Straw Hats' acceptance and support would make her believe in herself more. She might become bolder in using her skills, like when exploring dangerous ruins or facing powerful enemies.
Luffy might be excited to have a new member, as he always is about making new friends. But he's also not stupid, he would keep an eye on Kuro. Zoro would be very skeptical. He doesn't trust easily, especially someone with Kuro's reputation. Nami would probably try to figure out how she can benefit from Kuro's skills, while also being cautious not to be double - crossed.
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.
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.
It could be Chopper. Since Chopper is a doctor and Reiju has some medical knowledge, they might bond over sharing medical techniques and treating the crew's injuries. Also, Chopper's kind - hearted nature would make him a great friend for Reiju who might be used to a more cut - throat family environment.
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, as of the latest manga chapters, Yamato has indeed become a part of the Straw Hats. This decision brings new dynamics and adventures to the crew.