One common theme is friendship development. Writers often explore how Craig and Kyle's relationship evolves from just being classmates or acquaintances to a deeper bond. Another theme is adventure. They might be put in some made - up scenarios in South Park where they have to work together to solve a mystery or overcome an obstacle.
You can try Archive of Our Own (AO3). It has a vast collection of fanfics from various fandoms, including Craig x Kyle ones. Just use the search bar and type in 'Craig x Kyle' and you'll get a list of relevant stories.
One great Craig x Kyle fanfic could be 'The Unlikely Bond'. It focuses on how their different personalities gradually draw them together. They start off as just classmates but as the story unfolds, they find common interests and a deep understanding of each other.
Some Tumblr blogs are dedicated to South Park fanfiction as well. You can search for Craig x Kyle fanfiction on Tumblr by using relevant hashtags. But be aware that Tumblr's format might not be as organized as the dedicated fanfiction websites, so it might take a bit more effort to find exactly what you're looking for.
Popular themes in Craig x Kyle fanfiction can include growth. As they interact more, they could both grow as characters. For example, Kyle might learn to be more relaxed from Craig, and Craig might become more empathetic like Kyle. There are also themes about acceptance, not just of each other but also of the differences in the South Park community. Some fanfictions may focus on how they handle the judgment of others in the town. And a fun theme could be holiday - related, like how they spend Christmas or Halloween together, which can bring out different sides of their relationship.
Writers portray their relationship development in various ways. At first, they may depict Craig and Kyle as being in different social circles, with Craig being more of an outsider and Kyle being part of the main group. A turning point could be an event that forces them to work together, like a town - wide problem in South Park. As they work together, they start to understand each other better. Writers might also use internal monologues of the characters to show their changing feelings. For instance, Kyle might think about how Craig is not as bad as he initially thought, and Craig might find Kyle's determination endearing. Over time, the relationship can evolve from just tolerance to a real friendship or even something more, with shared glances, inside jokes, and a growing sense of loyalty towards each other.
Craig in 'Craig It's Kind of a Funny Story' remains a mystery. He could be a relatable character that the author uses to tell a story that is both funny and meaningful. Maybe he has some quirks or habits that make him stand out and drive the humorous plot. It could be that as the story progresses, we learn more about Craig's background, dreams, and what makes him tick.
I don't have enough information to say exactly who Craig Rosenberg is in this context. He could be an ordinary person whose life has been made into a story, or perhaps he is a public figure in a particular community and his story is being told.