What are some interesting ideas for a Sailor Moon SVTFOE crossover fanfiction?

One idea could be a crossover with the Harry Potter universe. Sailor Moon and her friends could attend Hogwarts and have to deal with both magical threats from the wizarding world and the dark forces they usually face. For example, they might help the students at Hogwarts fight off a new kind of dark magic that has similarities to the dark energy they combat in their own world.

A new character could be created as the main villain. This villain could be a powerful sorcerer who has studied the magics of both Sailor Moon and SVTFOE. He discovers a way to merge the two universes in a way that benefits him but is harmful to everyone else. He might try to control the Sailor Crystals and the magic of SVTFOE at the same time. To stop him, the characters from both universes would have to put aside their differences and fight together.

One idea could be a crossover with another popular animated show like 'Adventure Time'. Star and Marco could end up in the Land of Ooo and have to deal with the wacky creatures there while also trying to find a way back home. Another idea might be a crossover with a superhero universe. Maybe Star's magic could combine with superhero powers in unexpected ways.

Maybe there could be a dark force that is threatening both the Inuyasha world and the Sailor Moon world. So, Sailor Moon and her Sailor Guardians team up with Inuyasha, Kagome, and the others. They could combine their powers in unique ways. For example, Sailor Moon's healing powers could be used on Inuyasha when he gets seriously injured in a fight against the common enemy, and Inuyasha's strength could be used to protect the Sailor Guardians from some of the more physical threats in his world.

One idea could be that the Soul Reapers in Bleach are somehow affected by the magic in the Sailor Moon universe. For example, their zanpakuto (swords) start to gain new powers related to Sailor Moon's elemental powers like fire or water. Another plot could involve a character from Sailor Moon, say Sailor Mercury, using her intelligence to help the Bleach characters understand a new and dangerous threat that has elements of both universes. Maybe she could analyze some strange energy that is a combination of Hollows and the Dark Kingdom's power.

One interesting plot idea could be that Natsu, being a powerful fire mage, somehow gets transported to the Sailor Moon universe. He could team up with Sailor Mars, since they both have an affinity with fire. They might face a new enemy that is immune to normal attacks but is vulnerable to the combination of Natsu's dragon - slaying magic and Sailor Mars' spiritual powers.

One idea could be that the Sailor Scouts are transported to the Digital World. They team up with their respective Digimon partners based on their powers. For example, Sailor Moon could be paired with a Digimon that has lunar - related powers. They then have to fight a new enemy that threatens both the Digital World and the Earth.

One idea could be that Ranma somehow gets involved in the fight against the Dark Kingdom in the Sailor Moon universe. Maybe his curse could be related to the magic there. For example, his female form could be mistaken for a new Sailor Scout by the bad guys.

A possible plot is that a powerful dark entity is causing chaos in both the Sailor Moon and Twilight worlds simultaneously. The Sailor Scouts and the Twilight vampires and werewolves have to form an uneasy alliance. Sailor Mercury could use her intelligence to analyze the new enemy's weaknesses. Jacob might teach the Scouts some of his wolf - pack fighting tactics. The story could explore how the two very different groups overcome their differences and work together to save both of their worlds.

One idea could be that Ranma accidentally stumbles into the world of Sailor Moon. Maybe he gets caught up in a fight against a youma and the Sailor Scouts mistake him for an enemy at first. But then they realize he has his own unique fighting skills and they team up to defeat the common foe.