Well, in fanfiction, the Hermione body switching potion often leads to really interesting plot twists. It can be used to explore different characters' perspectives. For example, if Hermione switches bodies with Harry, we might see how Harry experiences Hermione's intelligence and her way of dealing with schoolwork. It also allows for some comical situations, like when Hermione tries to act like the person she's switched with but fails miserably at their particular quirks.
Typically, in fanfiction, the potion has some specific rules. It might require certain ingredients that are often unique to the writer's imagination. For example, it could need a hair from the person Hermione will switch with. Once the potion is brewed correctly and consumed, the body switch occurs instantaneously. It's like a magical transfer of consciousness.
If a villain switches bodies with Power Girl, they would likely immediately try to use her powers for evil deeds. They might go on a rampage, using her super strength to cause destruction. Power Girl, on the other hand, in the villain's body would have to be very strategic. She would need to use her knowledge of the villain's lair and minions to her advantage, while also trying to convince the other heroes that she is not who she appears to be. And for an ordinary person who switches with Power Girl, they might be overwhelmed at first, but then start to adapt and even have some fun with the powers, like flying around the city to see the sights.
The wizarding community at large would be in shock. Hermione was seen as a symbol of the 'good side'. Her switching sides could cause chaos and confusion. People might start to question their own beliefs. Some might even follow her lead if they have doubts about the current situation. And for Hermione herself, she would have to face a lot of criticism and hatred from those who still firmly believe in the original side she was on.
A more detailed fanfiction idea could involve Hermione creating a new version of the Polyjuice Potion with lemon as a key ingredient. She might be trying to improve the potion's effectiveness or perhaps make it more palatable. However, this new version has unforeseen side effects. For instance, it not only changes her physical appearance but also gives her the personality traits of someone who loves lemons passionately. So she starts acting in a very zany way, much to the confusion of her friends, and she has to figure out how to reverse the effects while still in the middle of an important adventure.
A great plot twist could be that the love potion Hermione is exposed to actually has a secondary effect. While it initially makes her seem infatuated, it's secretly stealing her magic. As she becomes more and more 'in love', her powers start to wane. Her friends notice the change in her abilities and suspect foul play. They then have to race against time to find out what's really going on and reverse the effects before she loses all her magic.
The Hermione family tree in potion fanfiction might show that her ancestors were great potion - makers. Maybe they had a special connection to a particular potion ingredient that was passed down through generations. For example, they could have had a unique way of handling mandrakes, which Hermione might then rediscover in her studies.
It could be a jealous rival. Maybe someone who is envious of Hermione's intelligence or her popularity among her friends. This person might think that by using a love potion on her, they can make her look foolish or get her into trouble.
In the fanfiction, Hermione might face a lot of internal conflict. The lust potion could make her have unexpected feelings towards someone. Maybe she'll struggle to resist the effects of the potion and try to maintain her self - control. It could also lead to some interesting interactions with other characters as they notice her changed behavior.
One popular fanfiction idea could be that Hermione accidentally consumes a love potion meant for someone else. She then starts acting out of character, perhaps showing an excessive amount of affection towards an unexpected character. This could create chaos in Hogwarts as her friends try to figure out what's wrong and reverse the effects.