Maybe some of the minor gods who are friendly towards Percy. They could provide him with places to hide or magic items that can help him avoid Artemis' detection. For instance, Hecate could give him a charm that makes him invisible to the goddess's sight for a short time.
His friends from Camp Half - Blood could help him. For example, Annabeth. She's smart and could come up with strategies to avoid Artemis. Also, Grover, with his ability to sense danger and his nature - related powers, might be able to lead Percy to safe places.
The Hunters of Artemis themselves might help Percy. There could be some hunters who see that Percy is not really a bad guy and that there's something wrong with Artemis hunting him. They could try to reason with Artemis or at least give Percy some tips on how to survive the hunt.
One possible plot could be that Percy has unknowingly offended Artemis in some way. Maybe he accidentally disrupted one of her hunts or desecrated a sacred place of hers. As a result, Artemis decides to hunt him down. Percy then has to use his wits and powers to avoid her arrows and find a way to make amends.
Percy could try to blend in with mortals. Since Artemis mainly hunts supernatural beings, if Percy could disguise himself well among mortals, he might be able to escape her notice. He could also call on his friends like Annabeth. Annabeth is very clever and might come up with a plan to trick Artemis. Maybe set up false trails or create illusions to mislead the hunters.
Well, in the 'Percy Jackson hunted by Shield' fanfiction, Percy's main source of help would be his demigod comrades. Annabeth Chase, with her brilliant mind and knowledge of architecture and strategy, could help Percy plan his escapes and defenses. Grover Underwood, being a satyr, has a connection with nature that could be used to create barriers or mislead Shield's agents. Additionally, Chiron, the centaur trainer at Camp Half - Blood, might have some ancient knowledge or magic that could be used to protect Percy or make him less detectable to Shield. There could also be other demigods with unique powers that could come to Percy's aid, for example, those with the power of invisibility or mind - control who could use their abilities to disrupt Shield's operations.
In this scenario, Percy would be in a very tough situation. Artemis is a powerful goddess. Percy might have to use all his skills and the help of his friends. He could try to reason with Artemis first. Maybe he'd show her that he's not a threat to her or her hunters. If that doesn't work, he'd probably have to run and hide in places where her powers are limited. For example, in areas protected by other gods who don't want Artemis to overstep.
Well, she could betray Percy by revealing his secrets to his enemies. Maybe she's forced to do so under some kind of magical compulsion or threat.
One possibility is that Percy grows up with a strong sense of independence and a connection to nature. Since Artemis is the goddess of the hunt, Percy might be trained in hunting and survival skills from a young age. He could also have a special bond with the animals in the forest, being able to communicate with them to some extent. This upbringing would likely make him a formidable fighter, not just with a sword but also with bows and arrows and stealthy combat techniques.
In the fanfiction, after Percy is captured by Artemis, it's possible that he is forced to join her on a quest. Artemis might need his help for something, like dealing with a powerful monster that only Percy has the skills to defeat. She could also be trying to keep him away from other gods or demigods for some reason. Another scenario could be that Artemis mistakes Percy for someone else who has wronged her, and she holds him captive until she figures out the truth.
The main antagonists would most likely be the gods themselves. Since the title mentions being hunted by the gods, they would be the ones sending various threats Percy's way. It could be Zeus, who is often quick to anger and punish those he thinks are a threat to his power.
Maybe the main antagonist is an ancient evil that has awakened. It has the power to manipulate Artemis's mind, making her kidnap Percy against her will. This evil entity wants to use Percy as a sacrifice to gain more power. So, while Artemis is the one who physically kidnaps Percy, the real force behind it, the ancient evil, is the true antagonist.
Perhaps a powerful and corrupted demigod could be the main antagonist. This demigod might be jealous of Artemis' power and popularity among the other demigods. He devises a plan to harm her, and Percy, being loyal to Artemis, has to give his life to save her from this rogue demigod.