The plot could be about Artemis trying to balance her duties as a goddess and being a mother. Maybe the child has some special powers that attract the attention of other gods or mythical creatures.
Perhaps the story could revolve around Artemis' child being kidnapped. Artemis then embarks on a quest to rescue the child. Along the way, she discovers things about herself as a mother and also uncovers secrets about her own past that are somehow related to the situation of her child.
It could be a mortal man that Artemis fell in love with in secret. Maybe a skilled hunter who caught her eye in the forest one day.
Perhaps the oc child of Artemis is being hunted by a powerful enemy who wants to use their connection to Artemis for their own evil purposes. The oc has to flee and find allies among the demigod world. They use their skills in archery and their knowledge of the forest, which they inherit from Artemis, to outwit their pursuers.
Maybe the child would have the power of camouflage like Artemis's hunters, but in a water - based form. They could blend in with the ocean currents or the mist that often surrounds Percy. And, considering Percy's demigod strength, the child would be physically strong as well. Their combat skills would be a blend of Percy's sword - fighting abilities and Artemis's archery skills, making them a formidable opponent in any battle.
One possible plot could be that in this crossover, Female Naruto is in a world where she has to protect her child from an unknown enemy. Maybe it's a new villain from another universe. She would use her ninja skills, which are already quite powerful, but with the added motivation of protecting her child, she becomes even more fierce. Her child could also inherit some unique powers, either from Naruto or from the other universe in the crossover, creating an interesting dynamic as they both try to survive and thrive in this new situation.
A plot might be about Harry's child struggling with the pressure of living up to their father's legacy. At Hogwarts, they constantly feel compared to Harry. But then, they find their own niche in the wizarding world by being really good at potion - making. They enter a big potion - making competition and end up using their skills to save the day when a dark potion goes wrong and starts affecting students. They prove that they can be great in their own way, not just because they are Harry Potter's child.
A plot could involve Percy being cursed and the only way to break the curse is to sing a song that moves Artemis. He has to learn about her past, her values, and her likes in order to create the perfect song. Or perhaps Percy discovers a new power within himself - the power of song - and he decides to test it out on Artemis, not knowing how she will react. This could lead to a series of adventures as he tries to make amends if she is initially offended.
The plot could be about a threat that affects both Spiderman's New York City and Artemis' domain. They meet by chance, perhaps through a magical portal. Then they have to figure out how to communicate and work together to stop the threat.
One possible plot could be that there is some sort of magical or divine intervention that causes Artemis, who is typically a virgin goddess, to become pregnant by Ares. This could lead to a great upheaval in the pantheon as the other gods react to this unexpected union and pregnancy. The story might explore how Artemis deals with the physical and emotional changes, and how she and Ares navigate their relationship in the face of divine disapproval.
One possible plot could be that they are on a dangerous mission together. In the heat of the moment, while protecting each other from a powerful enemy, their feelings of closeness intensify and they end up sharing a kiss. This would add an element of action and adventure to the story along with the romantic aspect.
Well, a recurring theme in 'child of artemis fanfic' is the struggle between the mortal and divine sides of the character. Being a child of a goddess means having certain powers and responsibilities, but also having to deal with the limitations of being part - human. Another theme is the pursuit of justice. Artemis is associated with justice in some ways, and her children in fanfics often strive to uphold what is right. And of course, the theme of sisterhood or brotherhood is there too, as they are part of a community of demigods related to Artemis.