One common theme is friendship. Despite their differences, they often find a connection. For example, in many fics, they start to see each other's good qualities.
Adventure themes are also seen. They could be on a quest together in the Homestuck universe, facing challenges side by side, which then strengthens their bond and leads to a romantic relationship. This gives the authors a chance to explore their characters in new and exciting situations.
One great John x Karkat fanfic is 'A Strange Bond'. It beautifully explores their relationship as they navigate the challenges in their world. The author does an amazing job of portraying their personalities and how they grow closer over time.
One great 'Homestuck Gamzee x Karkat' fanfic is 'The Bond Between Them'. It really delves into their complex relationship, showing how their different personalities interact. The author does a wonderful job of portraying Gamzee's laid - back yet somewhat unpredictable nature and Karkat's more uptight and easily - flustered self. It's full of heart - warming moments as well as some comical exchanges that are true to the Homestuck spirit.
One common theme is friendship development. They often start off not getting along or having misunderstandings, and then gradually form a deep bond. For example, in many fanfics, Karkat's brashness and Gamzee's more laid - back nature initially clash, but over time they learn to appreciate each other's qualities.
The 'karkat x kanaya complimentary colors fanfic' might explore the relationship between Karkat and Kanaya in the context of their being like complimentary colors. It could delve into how their personalities, which might be as different as complimentary colors, interact. For example, if one is more brash and the other more calm, their exchanges could be full of tension and growth. It might also use the concept of complimentary colors in a more symbolic way, like their roles in a story being intertwined like how complimentary colors enhance each other in a visual sense.
Fanfiction.net also has a selection. Search for tags like 'eridan x reader' and 'fluff' or 'gen'. You might find stories where they go on adventures together in the Homestuck universe, without any inappropriate content. They could be solving mysteries or helping other characters, and through these experiences, their relationship grows in a positive and family - friendly way.
One common plot is their exploration of different Alternian cultures together. Since they come from different backgrounds on Alternia, fanfictions might delve into how they share and learn from each other's cultural experiences.
One common theme is the idea of opposites attract. John and Karkat have very different personalities, and fanfics often play on how these differences can actually bring them together in a unique way.
You can try Archive of Our Own (AO3). It has a large collection of fanfiction from various fandoms, and there are bound to be some great Meenah x Karkat stories there. Just use the search function and type in their names.