Yes, there are likely many fanfictions with such a plot. Fanfiction writers often come up with creative scenarios like this. You can search on popular fanfiction websites using relevant keywords to find them.
One possible plot could be that Harry, being secretly a girl, has to constantly hide her true identity while dealing with the challenges at Hogwarts. Maybe she's afraid of how her friends would react if they found out.
Hermione and Ron are usually still there. Hermione would likely be an important figure, perhaps helping Harry keep her secret or being the first to suspect something different about her. Ron might have a different reaction to Harry being a girl, maybe with some initial confusion but still remaining a loyal friend.
Well, perhaps there could be a plot where Harry's transformation into a girl has some sort of magical side - effect. Maybe it affects his magic in ways he didn't expect. He could discover new spells or powers that are only accessible to female wizards. This would add an interesting twist to the traditional Harry Potter magic system.
In some fanfiction, Harry might be portrayed as secretly evil. This could be due to a writer's desire to explore different character arcs. Maybe they want to show how power could corrupt him or how a hidden past could change his true nature.
There are indeed 'Harry Potter is secretly married' fanfictions. Fanfiction writers often take creative liberties with the characters. They might imagine a scenario where Harry has to keep his marriage a secret due to various reasons such as threats from dark forces or to protect his family. This kind of fanfiction can range from light - hearted and romantic to dark and full of intrigue, depending on the writer's vision.
The relationship between Harry and Ron would likely change a great deal. Ron might be more protective or might struggle with his feelings in a different way. He could also be more hesitant to be as close to Harry as he was before, at least at first.
Well, in such a fanfiction, there could be various hints. Maybe Zoro's behavior might be more in line with typical female characteristics described in that specific fictional world, like being more empathetic or having different social interactions compared to the original male - character version. But it really depends on how the author has crafted the story.
In a lot of these fanfictions, it could be that Harry has a secret mentor. This could be an old wizard who has been secretly guiding Harry in potions, away from the prying eyes of the Hogwarts staff. This mentor could have seen Harry's potential early on and decided to help him develop his skills in private. Another aspect could be that Harry's own determination and his need to prove himself in a different area other than Quidditch or fighting Voldemort drives him to secretly practice and become good at potions. Also, the idea that there are hidden aspects of magic within him, perhaps related to the founders of Hogwarts, that only manifest in his potions - making ability.