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.
Well, in this fanfiction, the plot could start with Artemis being cursed. Percy, as the protector, has to find a way to break the curse. He embarks on a journey through different mythological realms. He meets old allies and new foes. Percy has to use his wits and his combat skills. He also has to learn more about Artemis's past and the secrets she holds in order to save her. This could lead to a deepening of their relationship, not in a romantic way but more of a mutual respect and friendship as they face these difficulties together.
The Titans could be the main antagonists. Even though they have been defeated before, some of them might have found a way to return or their followers could be causing trouble. They see Artemis as a threat or a target for their revenge against the gods. Another possibility is a new group of powerful monsters that have banded together and are specifically targeting Artemis for her power and influence among the demigods.
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.
Well, it could involve Percy being tasked with protecting Artemis in a way that goes against his normal alliances. Maybe some dark force is after Artemis and Percy has to use his skills in a new and unexpected way.
One possible plot could be that the son of Artemis discovers a threat to the demigod world that is related to his mother's domain. He then seeks out Percy for help because of Percy's reputation. Together, they embark on a journey to find a magical artifact that can stop the threat.
In a 'Percy Jackson adopted by Artemis' fanfiction, perhaps Percy is exiled from Camp Half - Blood due to false accusations. Artemis, who has always been intrigued by Percy's courage, takes him in. With Artemis as his new guardian, Percy gets involved in the Hunters' battles against ancient monsters that threaten the world. He also has to deal with the jealousy of some of the other Hunters who are not happy about a male being in their midst.
Well, it could be about Percy having to deal with the conflict of being the son of two such different deities. Maybe he has powers from both Orion and Artemis. For example, he could have Orion's hunting skills combined with Artemis's connection to the moon. He might struggle to fit in with the normal demigods as his origin is so unique.
The plot could involve the son of Artemis facing abuse from other demigods who are jealous of his unique parentage. He might struggle to find his place in the Camp Half - Blood, constantly facing discrimination and harm. Then, perhaps Percy Jackson could come to his aid and together they try to expose the bullies and change the situation at the camp.
She might be on a quest to retrieve a lost artifact of Artemis. This could involve traveling to different mythological locations, facing monsters along the way. Her skills as a daughter of Artemis, like her archery and tracking abilities, would be crucial in this journey.
One possible plot could be Percy finding out he's the son of Artemis in a very unexpected way. Maybe he has some powers related to the moon that start to manifest. He could be shunned by the other demigods at first because it's so unheard of for Artemis to have a son. Then he goes on a journey to find out more about his mother and his place in the demigod world.
A possible plot could be that Percy is initially unaware of his true parentage. He grows up with normal demigod problems, but strange things start to happen. He has an unusual affinity for the moon and animals, which are associated with Artemis. As he discovers the truth, he is caught in the middle of a power struggle between the gods. Some gods want to use him for their own purposes, while others want to destroy him. Percy has to fight to survive, make allies, and figure out his place in this new and dangerous world. He also has to deal with his feelings towards Artemis, who is not like a typical mother figure.