In the fanfiction of the Curse of Achilles in Percy Jackson, many authors like to play with the idea of Percy's vulnerability. Even though he has the curse which makes him almost invincible, there are always ways around it that the fanfic writers come up with. This could be related to his emotional state or some hidden loopholes in the magic of the curse.
Another theme is identity. With the curse, Percy is somewhat changed. He's no longer just the regular demigod. Fanfiction may delve into how he reconciles this new, more powerful self with his old identity. For instance, he might struggle with the idea that he's now a 'super' demigod while still wanting to be seen as the same Percy by his friends. This can lead to a lot of internal conflict within the character in the fanfiction.
It could be an old enemy of the gods who sees Percy as a threat because of the Curse of Achilles. Maybe a Titan who escaped from Tartarus and wants to use Percy's power for their own gain. If they can control Percy, they could have a powerful weapon against the gods.
One common theme is power and its consequences. The Curse of Achilles gives Percy great power, but it also comes with risks. Another theme is heroism. Percy has to be a hero while dealing with the limitations and advantages of the curse.
A great plot could involve Percy having to deal with the psychological impact of the Curse. He might start to feel overconfident and make mistakes. Then, his friends have to help him realize that the Curse is both a strength and a potential downfall. For example, he could be lured into a trap by an enemy who plays on his new - found sense of invulnerability.
There could also be antagonists. For instance, some old enemies of Percy might be drawn to him because of the Curse of Achilles. They might see it as a challenge or an opportunity to finally defeat him, and these antagonists would be important characters in driving the story forward.
Well, there's this fanfiction where Percy has to face off against ancient monsters while dealing with the Curse of Achilles. It shows his growth as a character. Also, some fanfictions explore how his relationships, like with Annabeth, are affected by the curse. For example, in a certain story, Annabeth is constantly worried about Percy getting hurt because of the curse's implications.
Perhaps there's a plotline where Percy has to keep the curse a secret from his friends. This could lead to some tense moments of near - discovery and the resulting drama as he tries to keep his friends in the dark while still relying on them in battles.
Well, it's quite an interesting scenario. If Percy gets the Achilles curse while reading fanfiction, he might be so distracted by the story he's reading that he doesn't immediately notice the full implications of the curse. Maybe he'd initially think it was just some strange side - effect from whatever fictional world he was immersed in through the fanfiction.
One possible plot could be Percy discovering his connection to Achilles while on a new quest. Maybe he has to face a powerful enemy that only his newfound link to Achilles can help him defeat. For example, he might gain some of Achilles' combat skills or invulnerability in certain situations.