A more emotional plot could involve one of them getting injured or sick, and the other having to take care of them. This situation could bring out deeper emotions and strengthen their bond. For example, John could get hurt during a battle and Karkat would be there by his side, nursing him back to health and realizing just how much he cares for John.
One plot idea could be them going on an adventure together in an alternate universe within the Homestuck world. They could face new challenges and enemies while also developing their relationship.
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 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.
A more complex plot could be that there is a traitor among the Tomorrow People and Stephen and John suspect each other at first. As they investigate, they start to uncover secrets about each other and the community. In the end, they find the real traitor and strengthen their relationship through this ordeal. This would involve a lot of mystery, suspicion, and character development.
Another option could be Tumblr. There are many Homestuck fans on Tumblr who might share or recommend 'karkat x john' fanfics. You can search for relevant tags or follow Homestuck - related blogs to see if they have any suggestions.
One common plot idea is an alternate universe where Rose and John meet under different circumstances. For example, instead of in their usual setting, they could meet in a completely different world or time period, like a steampunk version of their story.
One idea could be that AJ and John Cena team up to face a common enemy in the wrestling world. They could train together and combine their unique wrestling styles to create an unbeatable force.
The plot could involve Karkat and Kanaya initially being at odds due to their different personalities (like how different complimentary colors can seem jarring at first). But then, they are forced to work together on a project or face a common enemy. As they do, they start to see the value in each other's differences. Their relationship grows, and they realize that they are better together, much like how complimentary colors enhance each other in art or design.
One idea could be a crossover where Naruto's world and the world of X - 23 from the X - Men collide. Maybe X - 23 is on a mission and accidentally ends up in the Hidden Leaf Village. She has to learn to adapt to this new place with its different culture and ninja ways. Naruto could be intrigued by her and her abilities, and they could team up to face a common enemy.
One idea could be a story where Spiderman has to team up with his greatest enemies to fight a new, more powerful threat from outer space. This would force him to put aside his differences and find common ground with the likes of Doctor Octopus and Green Goblin.
Karkat is highly emotional. His passionate outbursts and strong opinions can create interesting dynamics in a 'Karkat x Reader' fic. He's not afraid to speak his mind, which can lead to both humorous and intense interactions with the reader.