Well, perhaps the plot could involve Luffy having to navigate a world where he is suddenly a girl. He might face challenges in how his friends perceive him now. Maybe he has to deal with different social expectations while still maintaining his goal of finding the One Piece. For example, some of his male friends might be overly protective or act a bit differently around him, and he has to figure out how to handle those new dynamics all while being in a female body.
One possible plot could be that Luffy, now as a girl, has to navigate the pirate world in a different way. Maybe the crew has to deal with different reactions from other pirates and people they encounter. Some might underestimate her because she's a girl, but Luffy's strong will remains the same, and she shows everyone that gender doesn't matter when it comes to being a great pirate.
Rayleigh would be a great candidate. He's an experienced pirate and has already trained Luffy for a while. He has a lot of knowledge about the world of pirates and could give Luffy a talk about the deeper secrets of the Grand Line or how to deal with the powerful enemies that lie ahead.
It could be about Luffy having an important conversation. Maybe it's about his dreams, his crew, or some kind of revelation he has. Without reading it, it's hard to say exactly.
In Luffy fanfiction, Shanks might talk about his hopes for Luffy's future as a pirate. He could mention how he saw the potential in Luffy when he gave him the straw hat.
His personality would stay largely the same in terms of his goals and values. He still wants to be the Pirate King. But in social situations, he could be more cautious. As a girl, he might face different types of challenges when interacting with other pirates or people in general. He might have to rely more on his wits rather than just brute force in some situations, which could be a new aspect of his personality development in this fanfic.
The Straw Hat crew's reaction would be quite diverse. Usopp might make some jokes at first about Luffy's new look but would support her all the same. Robin would be very observant and might notice how Luffy's new form could change the crew's dynamics. Franky would be his usual self, shouting some over - the - top phrases about how cool 'female - Luffy' looks. Brook would probably make some bone - related puns about Luffy's new femininity while still respecting her as the captain. Overall, they would all adapt in their own ways and continue to follow Luffy on their adventures.
If it involves sex - related talk, then it's not appropriate as it goes against the family - friendly nature of the original Luffy character and the One Piece series in general.
One popular type of 'One Piece' fanfiction involving Luffy and Dragon might be about their eventual reunion. Since Dragon is Luffy's father, many fans like to imagine the moment when they meet again. In some fanfictions, Dragon could be secretly guiding Luffy's journey without him knowing. This adds an interesting layer of mystery to Luffy's adventures as he is unknowingly following a path his father has some influence over.
One great fanfic could be where Luffy finally meets Dragon and they have an intense conversation about the future of the world. In it, Dragon might share some of his grand plans and Luffy could be inspired in a new way for his journey to find One Piece.