Some Tumblr blogs are dedicated to Diary of a Wimpy Kid fanfiction, including Greg x Rodrick. You can search for relevant tags on Tumblr and might discover some unique and interesting fan - created stories that you won't find on the bigger fanfiction platforms.
Some other platforms like Wattpad might also have 'rodrick x greg fanfic'. However, the quality may vary. You'll need to look through the search results and read the descriptions and reviews to find the good ones.
Another option is to ask on social media platforms. For example, on Twitter or Reddit, if you post a request for Greg and Rodrick fanfiction, there are likely fans who can point you in the right direction.
You can try searching on Archive of Our Own (AO3). It has a large collection of fanfictions across various fandoms, including for Rodrick and Greg. Just use the search function and type in their names along with 'yaoi' to narrow down the results.
In the fanfiction, their relationship might start with Rodrick teasing Greg as usual. But then, an event like Greg getting into trouble at school and Rodrick being the only one who can help him out changes things. Rodrick realizes he has a responsibility towards his younger brother. This makes Greg see Rodrick in a new light, and they start to become closer.
There may also be themes related to personal growth. Through their relationship, both Rodrick and Greg could grow as individuals. Greg might become more confident, while Rodrick could become more understanding. These fanfictions can use their relationship as a catalyst for character development.
One popular Greg x Rodrick fanfiction might be 'The Unexpected Bond'. It explores their relationship in a new and interesting way, showing how they might grow closer over shared experiences like a crazy family road trip.
One of the best is MoonlightWriter. They have a knack for creating engaging stories that make you feel for the characters. And then there's RainbowPen, who is known for their creative take on the relationship between Rodrick and Greg in their fanfictions.
Well, rivalry is a theme too. They sometimes compete with each other, and fanfics play around with this idea. But also, there's the theme of unity. When faced with external problems, they often come together. In many fanfics, this is shown in different scenarios where they have to team up against something or someone, highlighting their bond despite their differences.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, including pearl x greg ones.
Well, there's 'Greg and Rodrick's Adventure'. In this fanfic, they go on an unexpected journey together that forces them to rely on each other. It has some really great character development for both of them. And also, 'The Brotherly Connection' which focuses on the deeper emotional connection that can exist between them.