Perhaps in the 'harry potter fairy tg fanfic', there could be a plot where a fairy from the fairy realm comes to Hogwarts. The fairy has a special mission related to the magic at Hogwarts, like protecting a powerful ancient spell. This would bring a whole new dynamic as the Hogwarts students interact with this fairy from a different magical world.
Another plot idea might be that a group of students accidentally stumble upon a hidden part of Hogwarts that has a connection to the fairy world. In this place, they find out that they can transform into fairies for a short time. This transformation is not without risks, as they must learn to control their new fairy forms and also deal with any threats from the dark forces that are also interested in this power.
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.
Maybe a fanfic where the Sorting Hat from Harry Potter is brought to Fairy Tail. The guild members could be sorted into Hogwarts houses based on their personalities. Natsu might be a Gryffindor because of his courage, while Lucy could be a Ravenclaw for her intelligence. This could lead to some interesting interactions and competitions within the guild as they explore the different aspects of the Hogwarts houses.
One idea could be that the Fairy King has a secret alliance with Dumbledore. They work together to protect a powerful magical artifact that Voldemort is also after. Another could be the Fairy King taking Harry Potter under his wing to teach him unique forms of magic not taught at Hogwarts.
A plot in such a fanfiction could be that the fairy inheritance gives the character an enchanted item. For instance, a fairy - made wand that has powers beyond the normal wands in the wizarding world. This wand could attract the attention of dark wizards who want to steal it for their own evil purposes. The character then has to go on a quest to find out more about the origin of the inheritance and how to protect this special wand. Additionally, the inheritance might cause the character to have a different appearance, like having a faint glow or delicate wings that they have to hide from others at first.
One interesting plot idea could be Johnny getting transformed into a different creature and having to navigate his daily life in that form. For example, he turns into a small, furry animal and has to deal with his sisters' reactions, which might range from shock to over - protectiveness. Another could be a TG (transformation genre) where he and his dog Dukey swap bodies and hilarity ensues as they try to act like each other. A third idea might be Johnny being transformed into a superhero - like being but with some comical side - effects, like his powers only working when he sneezes.
Well, you could have a fanfic where Voldemort uses DND - style dark magic to open portals to other dimensions. The Order of the Phoenix has to quickly learn DND - style combat and magic rules to fight off the new threats that come through these portals. Harry could be sent on a special mission to find a DND - style mage who can teach them the counter - spells. Meanwhile, the Death Eaters are also trying to master this new form of magic for their own evil purposes. This would create a really exciting and unique story.
Perhaps a plot where the protagonist can choose to either side with the Ministry of Magic during a time of political unrest within the wizarding world or join a rebel group. This would involve different magical battles and moral dilemmas depending on the choice. In the 'harry potter cyoa fanfic', this could show different aspects of the wizarding society that we don't often see in the original books.
A cool plot for a Harry Potter Twilight fanfic could be a competition. The wizards from Harry Potter and the vampires and werewolves from Twilight compete in a series of challenges. These challenges could test both magic and the unique abilities of the Twilight characters. Or perhaps a love triangle between a Harry Potter character, a Twilight vampire, and a Twilight werewolf. It would be interesting to see how the different cultures and powers interact in matters of the heart.
Another plot could focus on the lives of the secondary characters from the original series. For example, Neville could be the head of Herbology at Hogwarts and discovers a new, dangerous plant that has some sort of connection to an ancient magic. The 'carry on fanfic' could then be about how he and his students deal with it, with some cameos from the main characters.
One idea could be that a dragon escapes from Gringotts and Harry has to use his skills to track it down. Maybe the dragon has a special connection to a powerful dark magic item that Voldemort was after.