His core personality might not change much. Luffy is still likely to be as carefree and adventurous as ever. However, he might become a bit more sensitive to certain things, like how people treat girls. He'd still be fearless in the face of danger, but could use his new form to his advantage in different ways, like when dealing with female characters who might be more likely to trust a girl.
Luffy's personality would likely remain at its core the same. He'd still be the goofy, food - loving pirate. But, he might start to notice things from a different perspective as a girl. For example, he could become more aware of the power dynamics between genders in the pirate world. He might also use his new identity to befriend different groups of people, especially those who are more open to a female presence. His determination to reach the One Piece wouldn't waver, but his approach to achieving it could be influenced by his new form.
Even as a girl in the fanfiction, Luffy would probably keep his positive and exuberant personality. He would still laugh in the face of danger and be ready to take on any opponent. However, he could develop a bit more empathy towards the female characters he meets. His loyalty to his crew would be unshaken, but he might show it in different ways. Maybe he'd be more of a mediator within the crew in case of disputes, using his new - found understanding of different perspectives. His love for adventure would continue to drive him forward, but his interactions with others would have a new layer added due to his changed gender.
His powers might not be affected at all. Percy's connection to water is more about his essence as a demigod rather than his physical form. So he could still control water, summon sea creatures, and heal himself with water just as well as before.
The Goro Goro no Mi could make the OC's personality more electric, in a sense. They might be more energetic and vibrant, always on the go. Since electricity can be both a destructive and a life - giving force, they could have a complex personality. They might be kind - hearted but also have a fierce side when it comes to protecting the weak. They could also be a bit of a show - off, using their powers to impress others. For example, they might create lightning shows in the sky just for fun or to gain attention.
It could lead to stronger bonds within the Straw Hat crew. They would understand Luffy on a deeper level and their loyalty might increase.
His personality might not change completely. He'd still be the intelligent and laid - back person he was. But he might become more empathetic. Since he's now in a female body, he could better understand the struggles that girls face, which could make him more sensitive to others' feelings.
Dipper's personality change could be quite complex. Since he's now a girl, he might feel more pressured to conform to certain standards. This could make him initially more reserved. But as he gets used to it, his adventurous spirit could shine through in new ways. He might start to approach mysteries from a different perspective, one that combines his old way of thinking with the new insights he has from being a girl. He could also become more protective of those he loves, as he now has a different understanding of vulnerability.
In a fanfiction where Luffy turns into a girl, the story could take an interesting turn. Luffy's dreams of becoming the Pirate King wouldn't change, but the way he approaches it might. As a girl, he could use his charm to get out of some tricky situations. For example, when dealing with some of the more traditional pirates or marines who might underestimate a girl. Also, the Straw Hat crew's dynamic would shift. Zoro might be more protective, not that he isn't already, but in a different way. And Chopper would be super curious about the sudden change and would constantly be checking if there are any medical reasons for it, even though it's a magical fanfiction change.
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.
His powers might not be affected much in terms of strength. However, the way he uses them could change. For example, his web - slinging might be a bit more graceful in his female form. Maybe his spider - sense could be more attuned to different things now, like more sensitive to emotions or subtler threats.
His powers would likely be severely limited. The Sharingan, which requires a certain level of mental focus and chakra control, would probably not work as effectively. As a baby, Sasuke's chakra system is not fully developed, so he might not be able to access the full potential of his powers. He might only be able to use the Sharingan in short bursts, like when he's really scared or in immediate danger.
I think Zoro's core personality of being tough and fearless would remain. However, being in a female body might make him a bit more aware of certain things, like how he's treated differently by some people. But overall, he'd still be the same Zoro who doesn't back down from a fight and is always looking to improve his skills.