You could also create a fanfiction where Uncle Donald is facing a difficult situation, like losing his job at the local factory. But through the love and support of his family and friends, he manages to find a new and even better opportunity. This would show his strength and the strong bonds in the family.
For Uncle Donald, focus on his quirks. His short temper can lead to some really funny situations. You can also show his soft side, like how he secretly bakes cookies for the nephews when they're sad. For the nephews, each one has a distinct personality. Huey is the smart one, so in the fanfiction, he could be the one solving puzzles or coming up with plans.
One idea for a Class of the Titans crossover fanfiction could be with the Percy Jackson series. You could have the demigods from Percy Jackson meet the heroes of Class of the Titans. Maybe they team up to fight a common enemy like a powerful Titan that has escaped from Tartarus. The different powers and personalities would make for an interesting dynamic.
A possible fanfiction idea is that Donald and Goofy enter a cooking competition. Donald is known for his short fuse in the kitchen, while Goofy is more laid - back. They face challenges like dealing with a picky judge and a malfunctioning oven. Their friendship is tested but in the end, they learn more about each other and their own strengths. This could also involve some cute moments like Goofy accidentally dropping ingredients and Donald getting frustrated but then they laugh it off.
One idea could be a human criminal who sneaks into Zootopia to steal some of the unique and valuable items only found in the animal city, like the high - tech gadgets made for different animals' needs. Maybe they target the Carrot Pen from the Bunnyburrow bank.
One idea could be to focus on the interaction between the Autobots and the characters from 'The Last Knight' universe. For example, how would Optimus Prime react to the ancient secrets and magic in that world? Another inspiration could be the concept of transformation in both. The Transformers can transform physically, while in 'The Last Knight' there might be metaphorical or magical 'transformations' of characters. You could explore how these different forms of transformation intersect.
One idea could be that the OC is a new student at Barden University and has an amazing, unique vocal talent that catches Donald's attention during auditions for the a cappella groups. Maybe the OC has a secret past related to music that gradually unfolds throughout the story, and Donald helps the OC overcome some insecurities related to it.
Perhaps they cross over into a world of fairy tales. Mickey becomes the knight in shining armor, Donald is the wizard's apprentice who can't quite get his spells right, and Goofy is the jolly giant. They have to rescue the princess (maybe Minnie who has also been transported there) from an evil dragon. Along the way, they learn about the power of friendship and how to use their unique abilities to overcome challenges.
A plot could involve a time - travel scenario. They are sent back in time to a crucial moment in American history, and they have to work together to ensure the future they know (with their presidencies) comes to pass. Along the way, they gain a new understanding and respect for each other as they face the challenges of the past.
Books, movies, and TV shows can be a wellspring of ideas for fiction. You can take a concept from an existing work and put your own spin on it. Just make sure not to plagiarize. Dreams are another interesting source. They often have strange and unique scenarios that can be developed into fictional tales. Also, observing the people around you - their mannerisms, conversations, and interactions - can spark ideas. You might see a couple arguing in a park and create a story about a relationship on the verge of collapse based on that one observation.
One idea could be that Percy uses his unique powers to form a group of male hunters who can protect the demigod world in a different way than the existing female hunters. Maybe he draws on his experiences with different gods and monsters to train them.