If Percy turns into a wolf, it could be really interesting. He could lead a pack of wolves in the forest, using his instincts and new - found strength. He might have to fight other supernatural creatures in the forest for territory. And his connection to the wild would be enhanced, making him more in tune with nature in a way he hasn't been before.
Perhaps Percy turns into a falcon. In this form, he could soar through the skies and spy on his enemies from above. He might use his falcon eyes to find a secret lair of a villain or to track the movements of the Titans. It would also give him a different perspective on the world around him, seeing things from a bird's - eye view.
One possibility is that Percy turns into a falcon. He could then use his new form to spy on his enemies from above. With his sharp eyesight, he might discover hidden lairs or secret meetings. This would give him an advantage in the story's battles or quests.
One possible plot could be Percy waking up as a girl and having to deal with the new physical and social aspects in Camp Half - Blood. Maybe the other campers are initially confused, but then they see that Percy (now a girl) still has the same heroic spirit and skills. She could go on a quest where her new female form gives her a different perspective on things, like how she interacts with female monsters or how she is treated by male gods differently.
Perhaps Artemis is testing Percy in some way. By turning him into a girl, she wants to see if he can still be as brave and resourceful. The plot could involve Percy learning about the female experience among the demigods. He could discover new aspects of friendship with female characters who now see him as one of their own. And he has to figure out how to reverse the transformation while also dealing with the current challenges.
A snake would be very challenging. Snakes move in a completely different way from humans or demigods. Percy would have to get used to slithering on his belly and seeing the world from a low, sideways perspective. Also, snakes have a different way of sensing their environment, like using their tongues to smell. Percy would need to adapt to this new way of experiencing the world.
In a fanfiction where Percy Jackson turns into Cerberus, a lot of things could occur. Since Cerberus is a guardian of the Underworld, Percy might find himself in the Underworld without really knowing how he got there. His friends would be really worried about him. He might start to discover new powers that come with the Cerberus form. For instance, he could have enhanced strength and a powerful sense of smell. But he'd also face challenges like communicating with his friends, as he can't just talk normally in that form. He'd have to figure out a way to let them know it's him.
The fanfiction could explore Percy's transformation from a human - demigod perspective. As a pegasus, he might have different instincts and emotions. He could struggle with the loss of his human form at times, but also find great joy in the freedom of flight. There could be a plot where he has to use his pegasus form to save his friends or the camp. Maybe he discovers a hidden power within his pegasus self that is unique and helps him in a crucial battle against an ancient enemy.
One possible plot is that Percy, now a girl, has to deal with the expectations society has for girls in that fanfic's setting. She could struggle with things like how she's supposed to dress or act. And there could be a whole new dynamic with her enemies too. They might underestimate her because she's a girl, but then she proves them wrong with her skills and courage, just like she did when she was male.
One possible plot twist could be Percy's struggle to adapt to the new gender. For example, she might face challenges in how society now treats her. Maybe she was used to certain privileges as a boy that are now different. Another twist could be in her relationships. Her friends might react in various ways, some being very accepting while others are confused or even distant at first. And she could also discover new aspects of herself, like different interests or ways of expressing emotions that were suppressed before.
One possible plot could be that Percy, as a child, has to navigate his newfound smallness while still having the memories of his older self. He might struggle to convince his friends that he is actually Percy, and they initially think it's some sort of trick. Then, he could use his knowledge from his older self to help them in a new and unexpected way, like solving a mystery that the younger versions of them couldn't figure out on their own.
Well, one possible plot could be Percy struggling with his new identity. He might have to deal with how his friends react. For example, Annabeth could be initially shocked but then help him adjust. Also, Aphrodite might have done it as a test of some sort, like to see if Percy can understand the female perspective better, which could lead to some interesting adventures where Percy, as a girl, has to face challenges in a different way than before.