Well, if Percy turns into a goddess in fanfic, he might gain new powers. For example, he could have the ability to control nature like a true goddess. Maybe he would also change in appearance, becoming more ethereal and beautiful. His relationships with other characters would also shift. His friends might be in awe of him, and his enemies might be more fearful.
His personality might become more refined. As a goddess, Percy could be more composed and less impulsive. He'd have to think more like a divine being, which might make him more calculating in his actions.
One possible fanfic could be about Percy befriending Athena. Percy, known for his courage, might initially be intimidated by Athena's wisdom and power. But as they interact more, perhaps during a quest where Athena's knowledge is crucial, they develop a bond. Percy learns from Athena's strategic thinking, and Athena comes to respect Percy's loyalty and determination.
One common theme is power and its consequences. When Percy becomes a goddess, she has to deal with the newfound power and how it affects her relationships and her sense of self.
The plot could be that Percy befriends Hestia. Percy is feeling lost and alone after a particularly tough battle. He stumbles upon Hestia's hearth in an old, forgotten temple. Hestia, being the goddess of the hearth and home, offers him warmth and comfort. They start to talk, and Percy realizes that Hestia has a unique perspective on the world of the gods and demigods. Their friendship grows as Percy visits her often, and Hestia becomes like a motherly figure to him, guiding him with her gentle wisdom.
One possible plot could be Percy having to deal with new powers. He might struggle to control them at first, like accidentally causing thunderstorms when he's angry. Another plot could involve other characters' reactions. His friends might be in awe or a bit scared. For example, Annabeth could be worried about how this change will affect their relationship. Also, Percy could face new enemies who are jealous of his new god - like status or want to use his powers for their own evil plans.
The story could start with Percy suddenly waking up as a kid. He'd be confused and a bit scared at first. Then, as he tries to figure out what happened, he'd start to explore his new - found 'kid - self'. His friends would help him adapt. The plot could develop as they try to find a way to turn him back. Along the way, there could be flashbacks to Percy's own childhood, which would add depth to the story.
In such a fanfic, Percy might lose some of his usual skills and knowledge. He could be more naive and impulsive, like a regular kid. For example, he might struggle with the more complex tasks he could easily handle as an older Percy. Maybe he'd be more curious about simple things around him, like the wildlife in Camp Half - Blood, which he might have taken for granted before.
One consequence could be Percy losing his human connections. His relationships with his friends and family were based on his shared humanity. As a god, he might find it hard to relate to them in the same way. For example, his mortal friends may age and die while he remains an immortal god, leading to a sense of isolation.