There could be. Fanfiction writers often come up with creative and unexpected pairings. To find a 'Spiderman and Hippolyta married' fanfiction, you could also try using specific search terms in search engines dedicated to fanfiction. Just keep in mind that the quality and nature of such fanfictions can vary greatly.
Finding a specific 'Spiderman and Sith married' fanfiction might be a bit of a challenge. Fanfiction communities are diverse, and while there are crossovers all the time, this one is not a common theme. Maybe in some very niche corners of the fanfiction world, someone has written a story exploring this strange union. It could involve things like how they met across different universes, how they deal with each other's powers and beliefs, and what kind of adventures or conflicts they might face as a married couple.
In this fanfiction, Rogue's power to absorb the powers and memories of others and Spiderman's spider - like abilities could create some interesting scenarios. If Rogue absorbs Spiderman's powers, she might be able to use his spider - sense in a more instinctual way than he does. On the other hand, Spiderman could learn from Rogue how to better control his powers when she has absorbed some of his essence. Their powers could also be used in combat in a more coordinated way, like Spiderman creating webs for Rogue to swing on while she uses her absorbed strength to take down enemies.
One way a Spiderman x Artemis fanfic could start is with Spiderman swinging through the city and suddenly getting zapped into Artemis' realm. He's confused at first but then realizes he has to work with Artemis to get back home. Along the way, they start to respect each other's abilities and form an unlikely friendship. They might even combine their powers to defeat a villain who is trying to disrupt both their worlds.
A common theme is the struggle between their different natures. Artemis is a virgin goddess, so the fanfiction often has to deal with how that aspect of her character is reconciled with her being married to Percy. Another theme is the power dynamics, as Artemis is a powerful goddess and Percy is a strong demigod.
Well, in a fanfiction of Artemis and Orion getting married, it could be that they first meet in a very unexpected way. Perhaps Artemis is on a hunt and Orion is lost in the forest. She takes pity on him and helps him find his way. As they spend more time together, they discover a deep connection. Their marriage could then be a grand affair, with all the gods and goddesses invited. But some might come with ulterior motives, creating drama and tension in the story.
In such a fanfiction, the author might focus on the cultural differences between their two characters. Kid Flash is known for his speed and somewhat carefree attitude, while Artemis is more serious and skilled in archery. Their marriage could be a story of two different worlds coming together, and how they learn from each other to make their relationship work.
One common antagonist could be an old enemy of Artemis who doesn't approve of her marrying Percy. This enemy might be a powerful Titan who sees their union as a threat to his plans for revenge against the gods.
One common theme is the struggle against the norms of the Greek pantheon. Since Artemis is a virgin goddess in the original mythology, her marriage to Percy goes against the established rules, so a lot of fanfictions explore the pushback they get from other gods. Another theme is the exploration of their different powers and how they combine. For example, Percy's control over water and Artemis's connection to the moon might be used in unique ways to solve problems in the story.
Well, in this fanfiction, perhaps Artemis is marrying a mortal she has fallen in love with. The story could be about how she tries to balance her life as a goddess with her new role as a wife. She might have to hide her true identity from the mortal world at first, and then as the story progresses, she reveals it, causing a lot of drama and yet also a deeper understanding between her and her new spouse.