Percy would likely include details about the magic items he's used. For example, Riptide, his trusty sword that can turn into a pen. He'd talk about how it felt in his hand during battles. Also, he might mention the food at Camp Half - Blood, like the ambrosia and nectar that healed him. Another detail could be the pranks he and his friends played on each other at the camp.
When Percy tells his story, he would include details about the prophecies he was part of. The pressure of having to fulfill a prophecy and how it affected his decisions. He'd also talk about the different powers he discovered he had as a son of Poseidon. Like controlling water, which he used in many of his battles. And he might share some of the inside jokes and traditions at Camp Half - Blood that only the demigods know about.
He might sing sea shanties. Given his connection to the sea as Poseidon's son, shanties would be a fitting choice. They could also be ancient Greek hymns that he somehow remembers from his demigod heritage.
Well, if Percy tells his story, it would surely include his adventures at Camp Half - Blood. He'd talk about his first discovery that he was a demigod, his encounters with the various monsters like the Minotaur. He might also mention his friends, like Annabeth and Grover. Their quests together, such as the search for Zeus' lightning bolt, would be a major part of the story. Percy would probably share how he felt during those dangerous times, the fear and the determination to succeed.
Percy might meet an old enemy who has somehow been resurrected or changed in the future. This enemy could be more powerful and have a new plan to take over the world or destroy the demigods. Or he could meet a group of time - traveling demigods from an even further future who are trying to fix something in Percy's future that has gone wrong.
There's a chance that it could be a character from Percy's family. For example, a distant relative who has been corrupted by some dark magic. They might betray Percy for their own gain or because they are being controlled, and this betrayal could lead to Percy being killed.
He might encounter new demigods who are also on the run or hiding from the traditional demigod society. These could be demigods with different powers or backgrounds that Percy has never seen before.
He might inherit the power of lightning, just like Thor. So he could be able to summon lightning bolts during battles, which would be a great addition to his existing water - based powers.
Annabeth Chase would most likely be one of his allies. She has always been by Percy's side, and she shares his sense of justice. If Percy decides to take on the gods, she would be there to support him with her intelligence and strategic thinking.
Perhaps it's a gift from his father, Poseidon. Since Poseidon has control over the sea and all things related to water, he might have some connection to a power that gives Percy wings, like as a way to help Percy reach new heights both literally and metaphorically.
Percy might run into Loki. Loki is known for his trickery. He could either befriend Percy for his own devious plans or try to deceive him. Percy, being used to dealing with tricky situations in his own world, would have to be on his guard against Loki's schemes.
In his new life, Percy could meet a kind - hearted librarian. She would be the one to introduce Percy to a whole new world of books that he never had time to explore before. There's also a chance that he'll meet a street - smart kid who helps Percy navigate the more mundane aspects of his new life, like finding the best places to eat or how to fix his bike. And perhaps a new teacher who has a mysterious past and seems to have an inkling of Percy's true nature.