One of the themes that often pops up is growth. Both John and Vriska can grow as characters through their interactions in the fanfics. Also, friendship or something more than friendship is a big theme. They start from different places, but in the fanfics, they might come to understand and care for each other in new ways.
Well, I'm not sure of the specific titles off the top of my head, but you can try looking on fanfic platforms like AO3. Just search for 'John x Vriska' and you'll likely find a bunch. Some might be AU (alternate universe) stories that give a fresh take on their relationship, while others could be more in - line with the original canon.
The theme of adventure also pops up a lot. Since Homestuck is set in a very strange and vast universe, John and Vriska often go on adventures together in fanfictions. These adventures test their relationship and help them grow closer. It's about how they face the unknown together and rely on each other in the process.
One great 'Homestuck John x Vriska fanfiction' is 'The Adventures of John and Vriska'. It delves into their relationship in a very interesting way, exploring how their different personalities interact. It has some really cool plot twists that keep you hooked.
One main theme is the clash of personalities. Equius is so rigid and proper while Vriska is more wild and unpredictable. Their relationship is often about how they deal with these differences.
There's a fanfic called 'Equius and Vriska: A New Understanding'. In this, it starts with their typical rivalry but then gradually shows them finding common ground. It's a great read if you like seeing their relationship evolve in unexpected ways.
One great fanfiction is 'Tavros and Vriska: A New Understanding'. It really delves into their relationship and how they could overcome their differences. Another one is 'The Redemption of Vriska in Tavros' Eyes' which shows a more empathetic side of Vriska through Tavros' perspective. There's also 'Tavros and Vriska: Beyond the Canon' which takes their relationship in a completely new and creative direction outside of the normal Homestuck storyline.
One common theme is the exploration of moral ambiguity. Sherlock is often seen as a 'good' character, Moriarty as 'evil', and John as the moral compass. Fanfics play with these roles, blurring the lines. For example, in some, Moriarty may have a redeeming quality. Another theme is the intense emotional and psychological relationships. There's often a love - hate dynamic between Sherlock and Moriarty, and John is the stabilizer in this volatile mix.
One great 'Unordinary John x Seraphina' fanfic is 'A New Bond'. It explores their relationship in a post - school battle scenario where they have to team up against a new threat. The way the author develops their characters and the chemistry between them is really engaging.