Perhaps it's a story where the two universes collide in some way. Violet's powers could be an asset to the Young Justice team in a battle against a common enemy. And during the course of the story, a relationship blossoms between her and Aqualad. They might share some quiet moments by the water, getting to know each other better.
It could also be a more angsty story. Violet might be an outcast in the Young Justice world at first because of her different origin. But one member, like Superboy, sees her potential and tries to help her fit in. Over time, they fall in love, but there are obstacles like the disapproval of some of the other team members or threats from Violet's own world that try to keep them apart.
It could be about Violet Parr joining the Young Justice team. Maybe she has to adapt to their way of doing things, and there could be a romantic subplot between her and one of the Young Justice members. For example, she might start to develop feelings for Robin as they work together on missions.
Fanfiction.net could also be a good place. However, the tagging system there might not be as refined as AO3. But it still has a lot of content. Look for categories related to both Violet Parr and Young Justice and browse through the stories to find the ones that focus on their relationship.
Perhaps Violet Parr gets a strange magical ability and she is sent to Hogwarts to learn how to control it. There, she meets Harry Potter. They become friends and together they discover a mystery within the walls of Hogwarts that has something to do with both the wizarding world and the world of super - heroes. For example, a hidden chamber that holds the secrets of how super - powers and magic could be combined.
One story could be about Violet Parr using her powers to save her family from a new supervillain in the city. She might have to overcome her own insecurities while facing this threat.
One possible plotline could be that Violet and Tony team up to solve a mystery in their town. Maybe there are strange occurrences that only Violet's powers and Tony's knowledge of the area can help figure out.
Yes, there are many appropriate Violet Parr fanfics. For example, some might focus on her training to become a better superhero, her interactions with her family members in new and interesting scenarios, or her making new friends within the superhero community.
Love against all odds is a big theme. Given Violet's unique situation as a super - hero in training, there are a lot of obstacles in their relationship. But fanfiction often shows them overcoming these odds. There's also the theme of growth. Both characters grow through their relationship. Tony becomes more understanding of the extraordinary, and Violet learns how to balance her two lives better with Tony in it.
It could be about Thanos coming to the Young Justice universe to collect the Infinity Stones. The Young Justice team would then have to band together to stop him from getting all the stones and causing destruction.
One possible plot could be that Naruto, through some interdimensional rift, ends up in the Young Justice universe where he meets Supergirl. They could start off as strangers, but quickly realize they have a lot in common. For example, both have superpowers and a strong sense of justice. Naruto's ninja skills and Supergirl's Kryptonian powers could combine in interesting ways during battles against common enemies. They might also have to overcome cultural differences, as Naruto is from a feudal - like ninja world and Supergirl from a more advanced, alien - influenced society in the Young Justice world.
One possible plot could be that the Parr family from 'The Incredibles' gets transported to the world of 'Young Justice'. The Supers of 'The Incredibles' could team up with the young heroes of 'Young Justice' to fight a common enemy that threatens both their worlds. For example, Syndrome's technology could be combined with some of the advanced weapons used by the villains in 'Young Justice'.
Perhaps the clone has memories of the original Red X that it doesn't understand. These memories could lead it on a journey of self - discovery, trying to figure out who it really is and what its connection to the original is. It could be a very character - driven story within the Young Justice universe.