It could be considered a popular theme among a certain subset of 'Percy Jackson' fans. The allure of this pairing lies in the contrast between Percy, the young hero, and Ares, the powerful and often volatile god of war. Some fans might see potential for a complex and passionate relationship in this contrast. Also, fanfiction gives writers the freedom to explore how such a relationship could develop, from initial attraction to the challenges they would face, which can be very appealing to those who like to delve deep into character relationships in the series.
One challenge is character consistency. Percy is a heroic and generally moral character, while Ares is the god of war with a more aggressive and sometimes cruel nature. Balancing their personalities in a loving relationship can be tough. Another challenge is the lore. The 'Percy Jackson' series has a well - established lore, and making a relationship between these two fit within that framework without breaking the rules of the world is difficult.
In fanfiction, the relationship could be developed by exploring their family ties. Since Percy is a demigod and Ares is a god, there could be some underlying connection through the divine family tree. Maybe they discover that they are related in a more distant way than they thought. This could lead to Ares having a more protective side towards Percy, or Percy seeing Ares in a less antagonistic light. Also, they could be forced into a situation where they have to communicate their feelings and motives clearly, like being trapped in a magical prison together. This would make them open up and start to build a more complex relationship.
Well, it could be about Percy discovering he has this unexpected connection to Ares. And then he has to deal with the reactions of his friends like Annabeth. Some of them might be distrustful of this new relation. Percy would then try to find out more about his connection to Ares through exploring old prophecies and ancient sites, all while trying to keep his regular demigod duties in check.
In Percy Jackson fanfiction, Ares is often portrayed as a very aggressive and war - hungry figure. He might be shown as having a short temper and being quick to anger, much like his depiction in the original series. For example, he could be seen starting battles or conflicts just for the sake of it, and his followers might be depicted as equally bloodthirsty.
One possible plot could be that Ares and Aphrodite's secret relationship is somehow discovered by Percy and his friends. Percy then has to decide whether to expose them or use this knowledge to his advantage in the ongoing power struggles among the gods. Maybe Aphrodite tries to charm Percy into keeping the secret, while Ares threatens him. This would create a lot of tension and moral dilemmas for Percy.
Most of the gods would be confused at first. Hera might see it as an opportunity to manipulate the situation for her own ends. She could try to use Percy's new connection to Ares to create more chaos or to further her own plans. Poseidon would be very conflicted. On one hand, he has a connection to Percy as his son, but now Percy has this new link to Ares which could put Poseidon in a difficult position among the other gods.
A lot of fanfiction involves Ares trying to corrupt Percy or his friends. He could offer them power in exchange for their loyalty, tempting them to turn away from their good - natured ways. It's also common to see storylines where Ares has some sort of vendetta against a particular character, like Annabeth, and he tries to get back at them through various devious means.
One common theme is identity. Percy has to figure out who he is with such an unusual parentage. Another is power. With Ares and Artemis as his parents, he might have unique powers that are explored in the stories. Also, there's often the theme of acceptance among his peers in the demigod world.
There is definitely some out there. A lot of fanfiction writers like to explore unique pairings and family relationships in the Percy Jackson universe. Some might be more action - packed, while others could be more about the emotional journey of Percy as the son of Ares and Artemis. You might have to dig a bit through the search results to find the really great ones though.