A crossover with the 'Percy Jackson' series would also be cool. Wizards from Hogwarts could meet demigods. Maybe they'd have to team up to fight a common enemy that threatens both the magical world and the world of the Greek gods. They'd need to figure out how to combine magic and the powers of the demigods to succeed.
One idea could be a crossover with the 'Lord of the Rings' universe. After Hogwarts, a wizard could accidentally stumble into Middle - earth through a magical portal. They could use their magic to help the Fellowship in their quest, perhaps by using spells to heal the wounded or to create distractions during battles.
Another possibility is a crossover with 'Sherlock Holmes'. A post - Hogwarts wizard could be living in London and get involved in one of Sherlock's cases. The wizard could use magic to solve the mystery in ways that Sherlock might find both fascinating and frustrating, as he tries to understand this new form of 'science' that is magic.
One idea could be a crossover with the 'Percy Jackson' series. Imagine Hogwarts students meeting demigods and having to work together to solve a mystery that involves both magic and Greek mythology. Another could be a crossover with 'Doctor Who', where the Doctor lands at Hogwarts and helps the students deal with a time - traveling threat. A third idea might be a crossover with 'Sherlock Holmes', with Holmes using his deductive skills to solve a magical mystery within the walls of Hogwarts.
A possible plot could involve a Hogwarts teacher from the past crossing over to the present day Hogwarts in a fanfiction. This could lead to interesting clashes between old and new teaching methods. Or perhaps a crossover with a character from a fairy - tale world. The teacher could help the fairy - tale character understand the more complex magic of Hogwarts.
One idea could be about Harry starting his own school of magic. He could combine the best of Hogwarts with new and innovative ways of teaching magic, like including Muggle technology in some lessons. Another idea is a fanfic focusing on Hermione's work in the Ministry of Magic, perhaps she's in charge of reforming some archaic laws regarding house - elves. A third idea might be a story about Ron and Neville opening a magical joke shop together, filled with all kinds of hilarious and magical prank items.
First, give them unique backstories. For example, if it's a crossover with 'Star Wars', a wizard who graduated from Hogwarts might have a family history that ties them to the Force somehow. Second, give them flaws. A character who is too perfect is boring. Maybe a wizard in a crossover with 'Doctor Who' is really good at magic but is extremely clumsy in normal situations. Third, let them grow. In the story, as they interact with the new elements from the crossover universe, they should learn and change.
Well, a good idea for a Miraculous Hogwarts fanfiction could be a story where Marinette discovers she has a hidden wizarding bloodline. She gets her Hogwarts letter and has to balance her life as Ladybug in Paris and a student at Hogwarts. She could use her creativity from her fashion designing in the wizarding world too, like creating unique magical robes. Chat Noir could also find a way to visit Hogwarts secretly to help her out when she gets into trouble with dark wizards or other challenges at school.
One interesting idea could be a crossover with "Moana". Elsa's ice powers and Moana's connection to the ocean could create a really cool dynamic. Maybe Elsa accidentally freezes part of Moana's ocean and they have to work together to fix it. Another could be with "Tangled". Rapunzel's long hair and her adventurous spirit combined with Elsa and Anna's journey in Frozen 2 would be exciting. Rapunzel could use her hair to help them climb mountains or cross chasms. A third idea is a crossover with "Beauty and the Beast". Belle's love for books and knowledge could help Elsa understand more about her powers and the history of magic in the Frozen world.
There are fanfictions where Harry and Hermione travel the world researching ancient magic. They discover hidden magical sites and unlock secrets that were long forgotten. This kind of story can be really exciting as it shows them in a new adventure outside of Hogwarts.
Some fanfictions explore Ron's life as he tries to balance his family life with his career in the wizarding world. He might be working in Weasley's Wizard Wheezes while also dealing with the chaos of having a large family. There could be stories where he has to come up with new products for the shop while also helping his kids with their magic studies.
A Thundercats and Star Wars crossover fanfiction would be really cool. The Thundercats could be in the Star Wars universe, and their unique powers and weapons could be a great addition. Maybe the Thundercats could help the Jedi or the Rebels in their fight against the Sith or the Empire. For instance, Cheetara's speed could be useful in battles, and Tygra's illusions could be used to deceive the enemy.
One idea could be Naruto being a transfer student to Hogwarts. He might use his ninja skills in the wizarding world, like using his speed to be great at Quidditch. Another could be that Naruto discovers he has magical powers in addition to his chakra, and he has to learn to balance both. And perhaps he makes friends with Harry Potter and they teach each other their unique skills.