The idea of them protecting each other is also common. For example, Crowley saving Aziraphale from some angelic danger or vice versa. And then there's the theme of self - discovery. They both have been part of their own 'worlds' for so long, and in fanfics, they often discover new things about themselves through their relationship with the other. It's really interesting to see how different authors play with these themes.
A very popular theme is the 'alternate universe' or AU. In these fanfics, the Good Omens world is reimagined. For instance, they could be in a modern high school setting, where Aziraphale is the nerdy but kind student and Crowley is the cool rebel. Or they could be in a historical setting, like the Victorian era. These AUs allow for a whole new set of adventures and relationship dynamics for Aziraphale and Crowley.
One common theme is the exploration of their relationship outside of the constraints of Heaven and Hell. Since they are an angel and a demon, their relationship is unique and fanfictions often play with how they can be together despite their opposing natures.
You can try websites like Archive of Our Own (AO3). It has a large collection of fanfics, and you can easily search for Good Omens Aziraphale x Crowley ones by using the relevant tags. There are also fanfic communities on Tumblr where fans might share their works or recommend good ones.
A common theme is also the exploration of their angelic and demonic natures. How do these aspects of them interact when they are together? There are also a lot of fanfics that focus on their adventures together, whether it's solving some mystery or going on a journey. It's all about the two of them and their dynamic.
One popular theme is their friendship. How they support each other despite being on different sides originally. Another is their shared experiences, like the times they've saved the world together.
There's also 'Aziraphale's Bookshop' which is set mostly in Aziraphale's beloved bookshop. It explores how Crowley visits and the little moments they share there. It's a really sweet fanfiction that captures the essence of their relationship through the cozy setting of the bookshop. There are some tender scenes that will make you smile.
One common plot is them going on adventures together outside of their usual angel - demon duties. For example, they might explore different parts of the world that are considered neutral ground. Another plot could be them dealing with the challenges of their relationship in a world where angels and demons aren't supposed to get along. And sometimes, there are fanfics where they work together to save the world in a more unconventional way than in the original story.
A fanfiction could explore what would happen if Crowley and Aziraphale were accidentally swapped into each other's bodies. They would have to navigate the other's life and responsibilities, which would lead to some hilarious and also some very heart - warming moments as they understand each other better.
A popular one is 'The Arrangement Expanded' which delves deeper into their early days of the arrangement. It shows how they started to trust each other more and more over time, with some really sweet and funny interactions.
On Archive of Our Own, there are many great non - NSFW fanfics about aziraphale and crowley. You can search by tags like 'Good Omens', 'aziraphale/crowley', and filter for the appropriate rating. Some popular ones often explore their relationship in different scenarios, like dealing with a new threat in London while still maintaining their unique dynamic.
Well, a lot of Crowley x Aziraphale fanfics focus on their unique dynamic. Some fanfics might show them going on adventures together that are not part of the original story. These adventures can range from solving supernatural mysteries to just exploring the human world in a more in - depth way. And then there are those that focus on the emotional development of their relationship, like how they come to truly understand each other on a deeper level.