One possible plotline could be Hermione accidentally gets hit by a spell that causes the transformation. Her friends then have to figure out how to reverse it while she has to deal with the new way people perceive her.
I'm not aware of any particular 'hermione transforms into a bimbo fanfiction'. Fanfiction can cover a wide range of themes and ideas, but this might be a rather unique and perhaps not as common transformation in the Hermione -centric fanfiction world. You could try reaching out to fanfiction communities on social media platforms to ask for recommendations.
One possible plot could be that Hermione is exploring some dark and ancient magic. She discovers a spell that has been long forgotten and decides to test it out. Unbeknownst to her, the spell was actually a dangerous transmutation spell that was used by dark wizards to transform their enemies into trolls. When she casts it, she transforms into a troll. This would then force her to rely on her wits even more, as a troll, to find a way to communicate with her friends and reverse the spell.
Well, one possible reason could be peer pressure. If she gets involved with a bad crowd that promotes certain behaviors, she might start to change. For example, if her new friends are all into excessive partying and dressing provocatively, she could be influenced.
Well, first of all, Harry and Ron would be extremely confused and worried. They would probably try to hide her from the other students and teachers at first. If she was found out, it could cause a big panic in Hogwarts. Some students might be scared and run away, while others might be curious. And Hermione, as a troll, would have to deal with her new form. She might find it difficult to move around in the castle, as trolls are much bigger and less agile than humans in the narrow corridors.
A plotline could involve Hermione being magically influenced by a charm that is meant to be a joke but goes wrong. As she becomes more like a 'bimbo', she starts to interact with her friends in different ways. Ron might be initially confused and Harry could be worried. But as the story progresses, Hermione uses her new - found different perspective to solve a mystery in Hogwarts that no one else could because she looks at things from an unexpected angle.
She could develop by first losing some of her traditional traits. For instance, she might become less interested in books and more interested in fashion. But then, as she realizes the downsides of this new persona, she starts to fight back against it. This could be a form of internal character development where she has to rediscover her self - worth.
He could have different interactions with the Hogwarts teachers. Teachers like Professor Snape might treat him (as Hermione) with a bit more respect due to Hermione's academic achievements. Harry could also use this opportunity to learn more about the inner workings of Hogwarts from the perspective of a different student. He might discover new secrets in the library or during private study sessions with professors that he wouldn't have as Harry.
She should surround herself with positive influences. By having good friends who have healthy values and attitudes, she is less likely to be influenced in a negative way.
Bimbo fanfiction typically involves fictional stories based on the concept of the 'bimbo' archetype. It often reimagines characters in the context of this stereotype, which usually includes characteristics like being overly sexualized, ditzy, and focused on appearance. However, such fanfiction can sometimes be criticized for perpetuating negative stereotypes.