What are some interesting plot ideas for a 'Harry Potter Polyjuice with a Creature' fanfiction?

One idea could be a character using Polyjuice Potion to switch with a Death Eater to infiltrate their ranks and gather information for the Order of Phoenix. This would lead to a lot of tense moments as they try not to be discovered.

One idea could be a situation where a group of Hogwarts students accidentally use the Polyjuice Potion and swap identities in the middle of an important exam. It would lead to chaos as they struggle to answer questions in each other's forms.

You could write a fanfic about a magical creature that can travel through time. It appears to Harry and his friends during their fifth year. This creature is being hunted by a powerful dark wizard from the future who wants to use its time - traveling abilities to change the course of wizarding history in his favor. Harry and his friends must protect the creature and figure out a way to send it back to its own time safely, all while dealing with the normal chaos of Umbridge at Hogwarts.

Well, perhaps a character uses the potion to turn into a teacher to change grades in order to get a friend out of academic trouble. They end up having to teach a class while in the teacher's form and hilarity ensues as they struggle to keep up with the subject matter. It could also lead to some self - discovery for the character about the challenges of teaching.

One interesting idea could be seeing how characters' relationships change. For example, if Harry was genderswapped, how would his friendship with Ron and Hermione be different? Maybe Hermione would be more protective in a different way. Another idea is the way the genderswapped character would handle situations like facing Voldemort. A female Harry might approach battles or magical challenges with a different set of skills or strategies.

Maybe the plot could revolve around a wizard who has a special ability to communicate with all magical creatures. As a result, different creatures from the Harry Potter universe, like centaurs, veelas, and house - elves, are attracted to him and form a harem. They then assist him in a quest to find a lost magical artifact that has the power to restore balance to the wizarding world.

One idea could be a story where a new creature is discovered and brought to the school. The students have to learn how to take care of it and in the process, they discover new magical abilities related to that creature.

A plot could be where a rare and endangered creature chooses Harry and Snape as its protectors. They must travel to different magical locations to find a safe haven for it. This would force them to interact and rely on each other's skills.

One idea could be that a character accidentally drinks Polyjuice Potion made from a pregnant person and has to deal with the sudden physical changes and the reactions of others. They might have to keep up the pretense while trying to find a way to reverse the effects, all while exploring the magic behind the potion in a clean, exciting way.

One idea could be exploring the backstory of a Dementor. Maybe it was once a wizard who dabbled in dark magic too much and was cursed to become that form. Another could be a story about a werewolf who tries to find a cure in the wizarding world outside of the Wolfsbane Potion. And also, a fanfiction about a Basilisk that has a secret connection to an ancient wizarding family.