Past Percy is likely to be more impulsive. He hasn't faced as many challenges yet and might act before thinking. Future Percy, on the other hand, would be more cautious and calculating, having learned from past experiences.
Well, they might initially be shocked to see each other. The past Percy could be amazed at how much the future Percy has changed and grown. Maybe the future Percy tries to give the past Percy some advice to avoid future mistakes.
Maybe the 12 - year - old Percy would be a bit scared at first. After all, seeing an older version of yourself is quite strange. But then they could start sharing stories. Future Percy could warn the younger one about upcoming dangers and how to avoid them, like the traps in a particular quest he's about to embark on.
The interaction could completely change the course of the story. If future Percy tells the 12 - year - old about a big mistake he made in the past, the younger Percy could avoid it. This would then lead to a whole new set of events. For example, if that mistake was related to making an enemy, not making that mistake could mean that new alliances are formed instead.
He could meet his future self. This encounter might be full of surprises as his future self could have different views and experiences. His future self might be more jaded or more powerful.
Percy's character could become more self - aware. Seeing his past self would make him reflect on how far he's come. He might realize that he's grown more confident and capable over time.
Well, perhaps Percy's future self comes back to warn him about something. It could be about an upcoming danger that he needs to avoid. Or maybe his future self has some wisdom to impart, like how to better handle his relationships with his friends or family. This encounter could change Percy's perspective on a lot of things in his current life.
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.
Well, Percy could warn his past self about future dangers. Maybe he'd tell himself to be more careful with certain enemies like Luke. It would change the course of his past adventures in an interesting way.
Perhaps there is no traditional antagonist. Instead, the conflict could be within Percy himself. His future self might have some dark secrets or regrets that Percy in the present doesn't want to face. So, in a sense, Percy's own denial or fear could be the 'antagonist' in this fanfiction.
In Percy Jackson god future fanfiction, the gods' personalities could change in many ways. For example, Zeus might become more lenient as he realizes the importance of the demigods. Or maybe Poseidon will become more withdrawn as he faces some internal conflict. Athena could become more open - minded and start to see the value in the demigods' unorthodox ways. These changes could be due to the events that unfold in the fanfiction world.