The Polyjuice Potion could create misunderstandings in their relationship. For example, if Ginny sees Harry seemingly flirting with someone who is actually him under the influence of the potion, she might get angry. On the other hand, if Harry sees Ginny acting strangely because she has been transformed by the potion, he could worry about her being under some sort of dark magic influence.
A possible plot is that Ginny accidentally drinks Polyjuice Potion that was meant for someone else. She transforms into an unknown person and gets lost in the wizarding world. Harry then has to find a way to reverse the effect and find her. He might have to go on a journey through different wizarding communities and face various challenges. Along the way, he discovers some secrets about the Polyjuice Potion that he didn't know before, like a rare ingredient that can make the potion's effect last much longer than normal.
Harry Potter himself is quite common. Writers like to put him in situations where he has to use the potion to transform for various reasons, like infiltrating the Death Eaters.
Hermione Granger is quite common. Since she's very intelligent and resourceful in the original series, in fanfiction she often uses the Polyjuice Potion for various purposes, like solving mysteries or getting access to restricted areas.
In Harry Potter fanfics, polyjuice potion is often a really cool plot device. It allows characters to transform into others, which can lead to all sorts of interesting situations. For example, a character might use it to infiltrate an enemy group or to play a prank on their friends. It adds an element of mystery and fun to the story.
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.
In a Harry Potter polyjuice potion mishap fanfiction, the person who drinks the potion wrongly might start to exhibit the wrong personality traits. Let's say they were trying to transform into Hermione but due to the mishap, they start acting like Draco Malfoy instead. This would cause chaos as they would be doing things completely out of character for the person they were supposed to be imitating. They might start bullying other students or being mean to their friends, creating a lot of drama and confusion in the wizarding world.
The Polyjuice Potion can be used to create a mystery. For example, a character wakes up in a different body due to the potion and has to figure out who did this to them and why. It adds an element of suspense.
Well, someone might end up with a really strange combination of features. For example, they could have the body of one character but the voice of another completely different character. It could lead to all kinds of misunderstandings. Maybe they try to blend in with a group but because of the mess up, they act in a way that gives them away immediately.
Ron could be the main character in a Harry Potter polyjuice potion mishap fanfiction. Ron is known for his sometimes hasty decisions. He might be so eager to prove himself or get involved in some secret mission that he doesn't follow the potion - making instructions properly. This could lead to a mishap where he transforms into an unexpected person, and then has to navigate through the wizarding world in this new form, trying to hide his identity from his friends and family while also trying to reverse the effects of the potion.