Another possibility is that Percy is sent to Hogwarts undercover as a Hufflepuff student to investigate some strange magical activity that might be related to the Titans or other Greek monsters. He has to keep his identity as a demigod a secret while trying to fit in with the Hufflepuff house. He could learn a lot from the Hufflepuff way of life, like their patience and kindness, and in turn, he could teach them some things about courage in the face of danger that's different from what they're used to in the wizarding world.
A great fanfiction idea could be that Percy Jackson is mistaken for a Hufflepuff transfer student. He initially struggles to fit in as he's so used to the rough - and - tumble world of demigods. But as he gets to know the Hufflepuff students, he realizes that their quiet strength, determination, and loyalty are just as valuable as the more obvious heroics he's used to. He could then use his experiences in Hufflepuff to become a better leader among the demigods, bringing back the ideas of community and fairness that he learned from his time in the Hufflepuff house.
Definitely. There are quite a few. A lot of fanfic writers like to cross over different universes, and Percy Jackson and Harry Potter are two very popular ones. In these fanfictions, the idea of Percy being an heir of Hufflepuff can lead to really interesting storylines. They might explore how he'd interact with the Hufflepuff house, its members, and the overall Hogwarts environment.
One possible plot could be Percy discovering his connection to Hufflepuff while on a quest. Maybe he stumbles upon an ancient artifact that reveals his heritage. He then has to balance his duties in the Percy Jackson world with his new - found identity in the Harry Potter world, and deal with the reactions of both his demigod friends and the Hogwarts students.
In an Alaska - based Percy Jackson fanfiction, Percy could be on a quest that leads him to the frozen tundra. He might discover an ancient Greek artifact that has been hidden there for centuries. This artifact could hold the key to preventing a major disaster, like the awakening of an old and powerful enemy. Along the way, he could team up with some local Inuit demigods who have their own unique powers and knowledge of the Alaskan wilderness.
One idea could be that Percy uses his demigod skills in the courtroom. For example, his ability to read Ancient Greek could come in handy when dealing with old legal documents or in cases related to archaeology where Greek inscriptions are involved. He might also use his combat skills in a more metaphorical way, like being a fierce advocate who 'fights' for his clients.
One idea could be that Percy, as the lone warrior, has to face a new threat alone. Maybe a powerful and ancient monster that has been awakened and no one else believes in its existence at first. He has to rely on his own skills and the limited resources he has.
One idea could be to write a fanfiction where Percy visits an ancient Greek city that has been forgotten by the modern world. He discovers a hidden power there that could change the fate of the demigods.
One idea could be that Percy discovers a demigod child who has been abandoned in the mortal world. He decides to adopt the child to protect them from monsters and to give them a proper home at Camp Half - Blood. He then has to teach the child about their demigod heritage and how to use their powers.
In fanfiction, Percy might discover a hidden connection between his powers and the archangel's. Maybe there's a prophecy that links them, and they have to figure out how to fulfill it together. The archangel could teach Percy some new skills or perspectives that are different from what he's learned in the demigod world.
One idea could be that Percy finds himself magically transported to Skyrim. He could use his water - based powers in the frozen landscapes, like creating ice bridges over rivers or using water currents to his advantage in battles against the various creatures in Skyrim.