Well, you could do a crossover of Arthurian legend with Celtic mythos. Picture King Arthur interacting with the Tuatha Dé Danann. Or perhaps a crossover between Hindu and Mayan mythos, where gods from both pantheons are brought together in a strange new world. It could lead to really unique storylines and character developments.
One idea could be a crossover between Greek and Norse mythos. For example, having Thor meet Hercules and seeing how their different strengths and personalities interact. Another could be a crossover of Egyptian and Japanese mythos, like Anubis and a Kitsune teaming up for some mysterious task.
One interesting example could be a crossover with Lovecraftian Mythos. The SCP Foundation already has elements that are somewhat similar to Lovecraft's works, so when combined, it can create a really eerie and complex story. For instance, the SCP entities interacting with the Old Ones can bring about a new level of horror and mystery.
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.
One interesting cthulhu mythos fanfiction could be about a modern - day detective who stumbles upon an ancient cult related to Cthulhu. He slowly uncovers the dark secrets of the cult as he delves deeper into the mystery, with each discovery leading him closer to the brink of madness.
One interesting Mythos Effect fanfiction could be a story that focuses on a new character's journey within the Mythos Effect universe. Maybe a character who discovers a hidden power and has to navigate the complex politics and power struggles in that world.
One idea could be a Zyuohger crossover with the Power Rangers. The Zyuohgers could visit the Power Rangers' world and team up to fight a common enemy. They could learn from each other's fighting styles and share their technology.
One idea could be a Barbie crossover with Disney princesses. Imagine Barbie in the world of Cinderella, helping her get ready for the ball. Another could be a crossover with superheroes. Barbie could team up with Wonder Woman to fight some common villains. And a third idea might be a crossover with the Wizarding World. Barbie as a student at Hogwarts, learning magic and making new friends there.
Well, a fun dinosaur crossover fanfiction could involve dinosaurs and aliens. Maybe an alien race discovers Earth during the time of the dinosaurs and tries to either study or conquer them. This could lead to an epic battle between the two very different species. Or perhaps the aliens genetically modify the dinosaurs to create super - dinosaurs to do their bidding.
One idea could be a Shino crossover with Naruto in a modern-day setting. They could be students in a high - tech ninja academy where they have to use their skills in a more urban environment. For example, Shino's bug techniques could be used to track down digital threats or solve mysteries in the city.
A Kirby and Sonic the Hedgehog crossover fanfiction would also be cool. Imagine Kirby in the fast - paced world of Sonic. Kirby could learn to run super fast by swallowing a power - up in Sonic's world. They would have to race against time to stop Dr. Eggman from using Kirby's power - stealing abilities to take over both their worlds.
A crossover with Harry Potter would also be cool. Ichigo could attend Hogwarts as a transfer student. He'd probably be sorted into Gryffindor due to his brave nature. And he could use his Zanpakuto to fight off dark wizards.