Perhaps Percy becomes a lawyer to fight against environmental destruction caused by powerful corporations. In the Percy Jackson series, he has a strong connection to the sea. So, he could use his influence as a lawyer to bring lawsuits against companies polluting the oceans. He would draw on his experiences as a hero in the demigod world to inspire others and make a real - world impact in the legal field.
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.
Another aspect could be Percy having to defend other demigods in a legal setting. Since the demigod world has its own set of rules and the mortal world doesn't always understand them, Percy would have to find a way to bridge that gap. He could use his knowledge of both worlds to create a defense strategy that protects his fellow demigods from being wrongly persecuted by the mortal legal system.
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.
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.
Percy might take on cases related to discrimination against those with special abilities. In the fanfiction world, there could be people with powers similar to demigods who are being mistreated. Percy, as a lawyer, would fight for their rights, using his own experiences of being different in the mortal world as a demigod. He could use his charm and quick - thinking, much like he did when facing monsters in his adventures, to win these cases.
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.
One idea could be that Percy uses his water powers in a unique way to protect Azula. Maybe he creates a water shield around her during battles, which is different from the fire - based defenses she's used to in the Avatar world.
A possible fanfiction could involve a crossover where some of the Avengers are sent to Camp Half - Blood. Imagine Tony Stark trying to figure out how the magic at the camp works while also being highly amused by the whole concept of demigods. Steve Rogers could bond with some of the more heroic demigods over their shared sense of duty. Meanwhile, Percy and his friends have to keep an eye on the Avengers to make sure they don't accidentally disrupt the delicate balance of the camp. And then, they all have to face a threat that targets both the Avengers and the demigods, like a group of villains who want to steal the powers of both.