One good fanfiction could be 'Overcoming the Fear' where Percy has to face his fear of drowning in a really unique underwater quest. The author does a great job of showing his internal struggle.
Create a really vivid and detailed underwater world. When Percy is facing his fear of drowning, the reader should be able to feel like they are there with him. Describe the coldness of the water, the way the light refracts, and the strange creatures that lurk. Make his fear palpable through the description of his surroundings. Also, give Percy a clear goal that is related to his fear. Maybe he has to retrieve an important item from the bottom of a dangerous underwater trench, and the only way to get it is to face his fear head - on.
Well, 'The Adventures of Percy and Thanatos' is a really cool fanfiction. It has a lot of action scenes where Percy and Thanatos interact in the Underworld. Then there's 'Thanatos: Friend or Foe?' which examines whether Thanatos can be truly trusted by Percy and his friends. And 'Percy's Encounter with Thanatos' is a short but engaging fanfic that shows a brief but intense meeting between Percy and Thanatos.
One great Percy Jackson Supernatural fanfiction is 'The Demigod Hunters'. It combines the worlds of Percy Jackson and Supernatural in an exciting way, with the characters from both universes teaming up to fight a common enemy. The story has great action scenes and interesting character interactions.
One great 'Percy Jackson is revealed' fanfiction could be 'The True Identity'. In this fic, Percy's real identity as a son of Poseidon is revealed in a very dramatic way during a battle. His powers suddenly flare up, and his true form is shown to his friends who had been in the dark until then.
Some fanfictions explore the aftermath of Percy's death from a more emotional perspective. His mother, Sally, could be a central figure in these, dealing with the loss of her son. The fanfiction might show how she copes with the grief and how the community around her, like the other parents of demigods, support her through it.
One popular Percy Jackson Percico fanfiction is 'The Sea's Embrace'. It delves deep into the relationship between Percy and Nico. The story has great character development and an engaging plot that keeps readers hooked. Another good one could be 'Under the Stars'. It shows their journey together in a unique and interesting way, with some really cool magical elements thrown in.
There's a fanfiction where Percy is a skateboard prodigy and he enters a big skateboarding competition. But his demigod powers start to interfere in a really interesting way. The story plays on his dual identity of being a skateboarder and a demigod, and it's full of action and humor.
One great 'Percy Jackson is OP' fanfiction is 'Percy Jackson: God of the New Era'. In this fic, Percy has powers far beyond his normal capabilities and it makes for some really exciting battles against new and old enemies. Another one could be 'Overpowered Percy Jackson: The True Hero'. It shows Percy using his enhanced skills to save not just his friends but the entire world in a more extreme way than in the original books.
One great Percy Jackson Thalia fanfiction is 'The Lost Sister'. It delves into Thalia's backstory before she joined the Hunters. It shows her struggle with her powers and her relationship with Percy in a very interesting way. Another one could be 'Thalia's Redemption'. This story focuses on Thalia making amends for some of her past mistakes while still maintaining her fierce personality. And 'Percy and Thalia's Adventure' is also quite popular. It's about the two of them teaming up for a quest that no one else could handle, full of action and their unique banter.
In a certain 'Percy Jackson no gods' fanfiction, Percy and his friends find themselves in an alternate dimension where there are no gods at all. They encounter a group of ancient beings who are not gods but have different powers. Percy has to lead his friends in making alliances with these beings, all while trying to find a way back home. This story shows Percy's leadership skills without the gods' influence.