One idea could be a story about Harry's summer before his first year at Hogwarts from the perspective of the Dursleys. Maybe Dudley has a change of heart after seeing Harry receive his Hogwarts letter and starts to be curious about this magical world, which could lead to some comical and heartwarming moments as Harry tries to explain things to him without getting into trouble with the Dursleys.
Here's a cool idea for a Harry Potter fanfic. What if there was a parallel Hogwarts in another dimension? Harry and his friends accidentally stumble into this dimension while working on a new spell. In this parallel Hogwarts, the houses are different, and the magic is more wild and unpredictable. They have to find a way to get back home while also dealing with the challenges and mysteries of this new world. It could involve new magical creatures, different types of magic classes, and an entirely new set of characters that they have to interact with.
One idea could be that the elf girl is a transfer student to Hogwarts from a different magical realm where elves have their own unique magic. She could befriend Harry Potter and they go on adventures together, exploring the secrets of both wizard and elf magic. For example, they might discover an ancient spell that only works when combined with elf magic.
One idea could be that Megara, with her sharp wit and street - smart nature, finds herself in the wizarding world of Harry Potter. She could team up with Harry and his friends, using her own unique skills to help them out in a dangerous situation, like facing a new dark wizard threat.
One idea could be that in a hidden corner of Hogwarts, a student discovers a baby dinosaur as their familiar. Maybe it was brought through a magical portal from a prehistoric era. The student then has to keep it a secret while trying to figure out how to take care of it.
One idea could be a story where a Wendigo somehow enters the wizarding world of Harry Potter. Maybe it's brought in by a dark wizard who wants to use it as a weapon. The Trio - Harry, Ron, and Hermione - would then have to figure out how to defeat it using their magic and knowledge.
One idea could be a crossover where Harry Potter and Annabeth Chase meet in a magical realm that combines the wizarding world and the world of Greek mythology. They could team up to solve a mystery that threatens both their worlds, like a dark wizard using ancient Greek magic for evil purposes.
A fanfic could be centered around a magical plant that has the power to cure lycanthropy. Remus hears rumors of this plant in the Forbidden Forest. He ventures in, facing various magical creatures and dangerous terrains. When he finally finds the plant, he has to figure out how to use it properly. This could involve a series of trials and errors, and perhaps some help from Hagrid who knows the forest well.
In Harry Potter and DC fanfics, odd ideas can range from crossovers where Harry Potter characters end up in the DC universe and vice versa. For example, imagine Harry Potter using magic in Gotham City. Another odd idea could be a character from DC, like Batman, somehow getting access to Hogwarts and trying to figure out the magical world's rules. It adds a whole new layer of creativity and unexpectedness to the stories.
One idea could be that Hulk somehow gets transported into the wizarding world of Harry Potter. Maybe a magical experiment gone wrong by a Hogwarts student creates a portal that sucks Hulk in. He could then cause chaos as he's not used to the magic and strange creatures there.