Well, England's personality could become more complex. She might retain her love for tea and literature, but express it in different ways. Instead of the gruff way she might have shared her tea preferences as a male, she could be more优雅 (elegant) in presenting it. Her sense of humor could also shift a bit. She might make more self - deprecating jokes related to her new form, while still maintaining her dry wit in diplomatic banter.
Her personality might not change drastically at first. England is known for being reserved and proud. As a girl, she could still be those things, but perhaps be more in touch with her emotions. For example, she might be more likely to show when she's hurt or offended instead of bottling it up like she might have as a male.
If America in Hetalia turns into a girl in fanfiction, her personality might become more nurturing. While the male America was often brash and bold, as a girl she could show more empathy. For example, she might be more patient in diplomatic negotiations, listening more intently to the concerns of other countries.
Her personality might not change drastically. Sirius was always rebellious and brave, and as a girl, she would likely still be those things. However, she might become more empathetic as she experiences the world from a different perspective. Maybe she would be more in tune with the emotions of others around her.
Her personality might become more innocent. As a Kyuubi, she was powerful and perhaps a bit menacing. But as a little girl, she could be curious about the world around her, constantly asking questions. She might also be more vulnerable and seek protection from those she trusts.
She could become more assertive in a different way. Instead of the brash assertiveness Spike sometimes showed as a male, as a girl she might use her charm and diplomacy to get what she wants. For instance, when trying to convince Twilight to let her go on an adventure, she might sweet - talk her instead of just being pushy.
She might be more empathetic. In the original, Orochimaru is quite cold and calculating. As a girl, she could still be intelligent and ambitious but also show more understanding towards others. For example, she might hesitate more before harming someone if she can sense their good intentions.
In this fanfiction scenario, Sonic's personality could have some interesting shifts. Sonic as a girl might be more likely to rely on her wits and intelligence in a different way. Maybe she'll use her charm and quick thinking to outsmart villains instead of always relying on her speed. Her sense of humor could also change a bit. She might use more self - deprecating humor or be more sassy. And when it comes to relationships, Sonic could be more open and communicative. For example, she might have deeper conversations with Amy Rose about their feelings and experiences, whereas before as a male Sonic, he was a bit more reserved in that regard.
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.
I think Tails' personality would be a mix of his old self and some new elements. He would still be the tech - savvy character we know. But as a girl, he might be more in tune with his emotions. He could also become more diplomatic, trying to bridge the gap between male and female characters in the Sonic universe. For example, he might start to mediate disputes between male and female groups more often, using his new understanding of both sides.
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.