Well, you could have a fanfic where Percy is given a science homework about marine biology, and he uses his knowledge from being the son of Poseidon to write an amazing paper. He might even bring in some sea creatures from the ocean to show as examples, which of course causes chaos in the classroom. Another idea is that the whole demigod gang has to do a group project on mythology, and they each contribute their own unique experiences with the gods and monsters.
First, think about the kind of homework Percy might get. Is it related to Greek mythology, like a research paper on a particular god? Then, consider his reaction to it. For example, if it's a boring math homework, he might be really frustrated. Start with a simple scene, like Percy sitting at his desk in Cabin 3, looking at the assignment. Then, introduce some conflict, like his ADHD making it hard for him to focus, or a sudden visit from Grover that interrupts him.
In a 'Percy Jackson tattoo fanfic', you could explore the idea of a tattoo artist who is actually a minor god or goddess. The story could follow Percy or another character as they go to get a tattoo from this divine artist. The tattoo could have powers that are both a blessing and a curse, like it gives the wearer enhanced strength but also attracts more monsters. And the process of getting the tattoo could be filled with mythological elements, like the ink being made from the essence of a magical creature.
Another concept could be a Phoenix being reborn as a human - like form and becoming Percy's ally. They team up to fight against a new threat that neither could face alone. The Phoenix - human hybrid could have special powers that combine the best of both worlds, and their friendship could be a central theme in the fanfic.
One idea could be a story where Percy and Phoebe team up to face a new threat that neither of them could handle alone. Maybe it's a powerful monster that has the ability to control water and fire, so Percy's water powers and Phoebe's skills need to be combined.
One idea could be a fanfic where Percy has a dream that he's in an alternate version of Camp Half - Blood. In this dream, the cabins are arranged differently, and there are new campers with strange powers. Another idea is a dream where Percy dreams of his future, seeing himself as a teacher at Camp Half - Blood, passing on his knowledge and skills to the new generation of demigods. Or perhaps a fanfic where Percy has a recurring dream about an ancient prophecy that he has to figure out in his waking life.
Imagine a fanfic where Percy has to navigate the New York City traffic while being chased by a pack of hellhounds. He has to use his water - based powers in creative ways, like creating water slides on the streets or using sewer water to slow down the hellhounds. This would be a really action - packed and fun story.
Another possibility is that Percy somehow gets transported to Eragon's world. He has to adapt to the new environment and figure out how his demigod powers work there. Eragon could initially be suspicious of Percy but then they realize they can help each other. Percy could teach Eragon about water magic, which is new in Eragon's world, and Eragon could show Percy how to ride a dragon, which would be an amazing experience for Percy.
One idea could be to set the fanfic at Camp Half - Blood. Have Percy's friends plan a surprise birthday party for him. They could organize a special quest just for the occasion, like finding a long - lost gift from Poseidon. The party could include a big bonfire with blue food and drinks, as blue is Percy's favorite color.
Perhaps Percy's loved ones are made to believe false rumors about him spread by an unknown enemy. As a result, they turn their backs on him. Percy would need to find a way to expose the real culprit behind the rumors and regain the trust of his friends and family.
One idea could be that Cleopatra is actually a demigod in the Percy Jackson universe. Maybe she has some special powers related to water, like being able to control the Nile in a way that no one else can. This could tie into the Percy Jackson world where demigods have unique powers.