The fanfiction could start with Artemis getting angry with Percy for some reason, like he disrupted one of her hunts. So she uses her powers to turn him into a jackalope. As a jackalope, Percy is small and vulnerable, but he also has some unique skills. He can jump really high, which he uses to escape from predators. His friends are shocked when they see him, but they quickly decide to help him. They go on a journey to find Artemis and ask her to turn him back. On the journey, Percy has to deal with being hunted by other creatures who see him as an easy target, and he also has to learn to control his new body.
Percy would probably be really confused at first. I mean, one moment he's a normal demigod and the next he's a jackalope. He'd likely try to figure out what happened and how to change back right away. He might be a bit frustrated with Artemis for doing this to him without much warning.
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.
One possibility is that Artemis has been misinformed. Some enemy of Percy has tricked her into thinking that Percy is a danger to the demigods. So she kidnaps him to stop him from causing harm. But as she keeps Percy captive, she slowly realizes that she has been deceived when Percy starts to explain his side of the story and the real threats he has been fighting against.
One possible plot could be Percy getting caught in one of Artemis' hunts by accident. They initially clash due to their different natures but gradually develop feelings for each other.
A plot could be that there's some sort of dark magic that is affecting the balance between the gods and the demigods. Artemis and Percy are brought together to combat it. Along the way, Percy shows a side of himself that Artemis is drawn to. His courage and selflessness intrigue her. And in a moment of vulnerability, Artemis kisses Percy. This kiss then becomes a catalyst for a deeper exploration of their relationship and the greater threat at hand.
One possible plot could be that Artemis is captured by some powerful ancient enemy, like a primordial being. Percy, with his skills and courage, embarks on a quest to find her. He might face various challenges and monsters along the way. Maybe he has to solve some riddles related to the moon, as it's Artemis's domain. Finally, he locates Artemis and uses his water powers in a creative way to defeat the captor and free her.
One possible plot could be Percy having to defend Artemis from a new and powerful enemy. Maybe a primordial being has awakened and is targeting Artemis. Percy, with his skills and the help of his friends, must fight this enemy. He could also have to deal with the politics among the gods as he tries to protect Artemis, since some gods might not be so happy about his interference.
In this fanfiction, it could be that Artemis is in a situation where she is about to be killed or lose her powers forever. Percy, being the selfless hero he is, takes on a deadly task to prevent that from happening. Maybe it involves facing an ancient and malevolent god who has a vendetta against Artemis, and Percy uses his unique abilities and the element of surprise to try and stop this god, but at the cost of his own life.
The plot might involve a prophecy that somehow links Percy and Artemis. This prophecy could bring them together in a journey across different realms. Along the way, Percy discovers a new side of Artemis, one that is not just the cold and distant goddess. Artemis, too, sees Percy's loyalty and selflessness. Their relationship evolves as they face numerous challenges and obstacles, and they realize that their love is something that is fated and cannot be ignored.
The plot could start with Percy being sent on a mission that somehow intersects with Artemis's territory. Maybe he's looking for a powerful magical item that Artemis also has an interest in. At first, they might be at odds, with Artemis seeing Percy as an intruder. But as they face challenges together, like fending off a horde of mythical beasts, they start to respect each other. Percy's ability to think on his feet and Artemis's strategic mind work well together. Eventually, they realize they have more in common than they thought and form a friendship based on mutual respect and shared goals.