One great Percy son of Demeter fanfiction is 'Percy's Green Thumb'. In this story, Percy discovers his Demeter - given powers in a really interesting way. He starts to be able to make plants grow at an extraordinary rate, which helps him in battles and also in creating beautiful gardens around Camp Half - Blood. It's a really cool take on the idea of Percy being Demeter's son.
Yes, there are quite a few. You can check out platforms like Archive of Our Own (AO3). There, you'll find a variety of fan - created stories that explore the concept of Percy Jackson as the son of Demeter. Some might focus on his new powers related to nature and agriculture, while others could delve into how his relationship with the other demigods changes due to this new lineage.
In 'The Traitorous Demeter', there's a major plot twist where Demeter seems to turn against Percy. This goes against the normal mother - son type relationship expected. It turns out she has been influenced by an ancient evil, and Percy has to find a way to break that influence and save her, while also dealing with the chaos it causes among the demigods.
Chiron is also likely to be a common character. He would be the one to help Percy adjust to his new identity as a son of Demeter. And there could be antagonists too. Maybe some monsters that are specifically targeting Demeter's children because of their connection to the earth and its resources. They could be trying to disrupt the balance that Demeter's children help maintain.
One interesting plot could be Percy having to learn about Demeter's powers and how to use them in a unique way. For example, he might discover a new form of plant - based magic that only a son of Demeter could access. This could lead to him using plants to fight monsters in a really creative way, like making thorny vines trap foes.
One great 'Percy Jackson Son of Water' fanfiction is 'The Aquatic Adventures of Percy'. It delves deeper into his water - based powers and takes him on a journey across uncharted underwater realms. The author does a wonderful job of expanding on the existing lore in the Percy Jackson universe.
Another god could be the antagonist. For instance, Hades might be jealous of Demeter's newfound 'son' and the attention Percy is getting. He could send his minions to cause trouble for Percy or try to undermine Demeter's influence on Percy, leading to a series of battles and challenges for Percy to overcome.
I've read a fanfiction where Percy is the son of Lupa and Chaos and it focuses on his relationships. 'Percy's Bonds' is the name. It shows how his different heritage affects his friendships and romances, and how he has to come to terms with who he really is in the context of his relationships.
One great fanfiction could be 'Percy's New Family in Aphrodite's Realm'. It explores Percy's adjustment to being Aphrodite's adopted son. He has to learn about love and beauty in a whole new way. For example, he might start to see the beauty in things he never noticed before, like the way the sun reflects off a calm lake in the middle of a forest.
One possible plot could be Percy discovering his new identity as the son of Demeter and struggling to adapt. He might have to learn new skills like controlling plant growth and communicating with nature spirits, all while still dealing with his normal demigod challenges.
One idea could be Percy exploring his new powers related to Demeter. Maybe he can control plant growth in unique ways, like making plants form protective barriers. Another could be his interactions with Demeter's other children. He might face some jealousy from them at first but then prove himself and form strong bonds.