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.
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.
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.
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.
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.
One adventure could be when an interdimensional rift opens up that is spilling out all kinds of dangerous creatures from both the world of Greek mythology and other high - tech alien dimensions. Percy and Tony would have to team up to close the rift. Percy would fight off the mythical beasts like cyclopses and harpies, while Tony deals with any alien threats. They could also have an adventure where they are trying to find a cure for a strange new disease that is affecting both normal humans and demigods. Tony would use his scientific knowledge to analyze the disease, and Percy could search for any magical herbs or items that might be a part of the cure.
Maybe they embark on a journey to rescue a captured demigod. Along the way, they face various challenges like crossing a dangerous river filled with sea serpents. Percy's knowledge of the water and his brother's problem - solving skills (again, depending on how the fanfiction portrays him) would help them get through the obstacles.