If Percy Jackson were to redo his life in fanfiction, it would be a wild ride. He might start by being more upfront with his mother about his strange experiences. He could then take steps to better prepare himself for the world of demigods. Perhaps he'd form alliances with other demigods sooner, and they could all work together to face the threats from the start. This could lead to a completely different power dynamic in the demigod world. He might also have a chance to explore his powers more deeply without the immediate pressure of constant battles and quests.
One interesting plot twist could be that Percy discovers a hidden power within himself much earlier. Since he already has the experience of his first life, he might be more in tune with his demigod abilities. Another twist could be that he decides to side with different gods in the power struggles, changing the whole political landscape of the demigod world.
One interesting plotline could be Harry using his knowledge from his first life to prevent certain tragedies. For example, he might be able to save Sirius Black much earlier by being more cautious about the events at the Ministry of Magic. Another could be him changing his relationships with his classmates. He might befriend Draco Malfoy in a different way, perhaps by reaching out to him and understanding his family situation better, which could lead to a very different dynamic at Hogwarts.
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.
If Percy relives his life, he could completely rewrite the prophecy. He may not make the same mistakes that led him to fulfill the prophecy in the original way. Instead, he could find new ways to deal with the threats to the demigod world, like finding alternative solutions to the problems caused by the Titans and the Giants. He could also have a chance to explore more about his mother's side of the family, which was not much delved into in the original story.
Percy copes by holding onto his hope. He knows that his life on the streets is just a temporary situation. He spends his days looking for clues about how to get back to his normal life. He also tries to stay positive by remembering the good times he had at Camp Half - Blood. He tells stories of his adventures to the other homeless people, which not only helps him but also gives them some entertainment and hope.
There could be. Fanfiction writers are very creative and come up with all kinds of ideas. Since Percy Jackson is a popular character, there are many different takes on his adventures and experiences in fan - created stories. While peeing his pants might seem a bit odd, it could be part of a comical or unique story within the fanfiction world.
Voldemort would still be a crucial character. Since Harry is redoing his life, he might try to defeat Voldemort in a more strategic and less dangerous way. Other characters like the Weasley family, who were always there for Harry, would be involved too. They could be part of Harry's new support system in his redone life.
Maybe Harry realizes he made some mistakes in his past and decides to go back in time to correct them. He could try to save his loved ones who died in the original story.
Perhaps she's a sister who was thought to be dead but actually survived. She could have been corrupted by the experiences she had while being 'dead'. When she returns, she blames Percy for not saving her properly. This false blame leads her to betray Percy. She could start spreading rumors about Percy being a coward or a bad leader among the demigod community.