It could lead to all sorts of wild adventures. Maybe the two Percys have to work together to overcome some huge challenge that one alone couldn't handle.
The adventures could be really diverse. One Percy might go on a quest to find a way to reunite, while the other has to face off against new villains. They could also have different relationships with the other characters in the story, adding a lot of complexity and excitement.
This plot twist could cause a lot of chaos. One Percy might be more cautious while the other is more reckless, creating tension and drama.
He'd probably have trouble coordinating the two halves and dealing with their different thoughts and desires.
He could have adventures involving other sea - related deities. Since Thetis is a sea - goddess, he might interact more closely with her kin. For example, he could be sent on a quest by Thetis to retrieve a powerful artifact from the deep sea that is guarded by a fearsome sea - monster.
Perhaps he likes the ones that focus on Percy's adventures in new and unexplored places. For example, fanfic where Percy goes to a different realm in Greek mythology that wasn't covered in the original books.
They could have an adventure where they have to retrieve a lost artifact that is important to both their parents. Percy could use his ability to control water to navigate through underwater caves or obstacles, while Annabeth's knowledge of architecture and strategy would help them figure out the puzzles and traps along the way.
He probably has adventures fighting new and different kinds of monsters. The lightsaber would give him an edge in combat against creatures that are used to more traditional weapons.
He could go on adventures to the far reaches of the Underworld. With all the gods' powers, he might be able to access areas that were previously off - limits. He could also journey to the homes of the gods and goddesses to learn more about their powers and how to use them better.
Percy as a pirate captain would likely have a ship with special features. It could be enchanted in some way, perhaps having the ability to sail faster than normal ships due to some demigod - related magic. His cabin on the ship might be filled with mementos from his previous adventures on land, like a trident he once found or a piece of armor from a defeated monster.
In some fanfictions, the Nemean Lion might be given more human - like intelligence. So, Percy has to outwit it rather than just relying on his physical strength. He could use his knowledge of Greek mythology to find the lion's weakness that others don't know about.
Typically, fans of the Percy Jackson series read the fanfic. This includes young readers who are really into the world of Greek mythology as presented in the books. They might be looking for more stories about their favorite characters.