They might use their knowledge of both sides to outwit them. Since Aziraphale knows Heaven's ways and Crowley knows Hell's, they can anticipate the moves of both. For example, they could set up false trails or misinformation to keep Heaven and Hell at bay.
Perhaps they form an alliance of sorts with some other beings who are also tired of the constant tug - of - war between Heaven and Hell. These allies could help them deal with the reactions from the two sides. They could act as a buffer or provide distractions while Aziraphale and Crowley focus on raising the Antichrist in a way that they believe will lead to a better outcome for everyone involved.
One possible plot could be that Aziraphale and Crowley initially struggle with the idea of raising the Anti - Christ. They might try to guide the child in a way that doesn't lead to the apocalypse. For example, they could expose him to both good and evil in a more balanced way than expected. Maybe they take him on adventures to show him the beauty of the world as well as its darker sides, all while trying to hide his true identity from the forces of Heaven and Hell that are eager to use him for their own ends.
One popular Crowley Aziraphale fanfic could be 'The Arrangement Expanded'. It delves deeper into their relationship and the little moments they share outside of the main events in the show. Another might be 'Crowley's Garden', which could explore Crowley's love for his plants in a more in - depth way in relation to his bond with Aziraphale.
Another reason could be jealousy. In some fanfics, they might both be interested in the same person or thing, and Aziraphale's actions might seem unfair to Crowley. Say there's a powerful artifact that Aziraphale wants to give to Heaven, but Crowley thinks it should be kept out of the hands of both sides. So Crowley yells out of frustration.
It's hard to say if they are extremely popular in a general sense. While there is a large and diverse fan community for Good Omens, not everyone is interested in this particular type of fanfic. Some fans might be more into the romantic or adventure - based fanfics about aziraphale and crowley.
You can start by looking on fanfic platforms like Archive of Our Own (AO3). Just type in 'Crowley Aziraphale' in the search bar and you'll get a whole list of fanfics. You can also check out Goodreads for any fanfic recommendations related to them.
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.
There are many on FanFiction.net as well. Some might be set in alternate universes where Crowley's outburst at Aziraphale is a turning point in their relationship. It could be because Aziraphale made a decision that Crowley thought was too dangerous or against their unspoken bond. These fanfics can really dig deep into the emotions of the characters.
You can start by looking on popular fanfic websites such as Archive of Our Own. Use the search function and type in 'Crowley x Aziraphale'. You'll get a list of relevant fanfics. You can also check fan communities on social media platforms like Tumblr or Reddit. People often share and recommend their favorite fanfics there.
Crowley's more laid - back and devil - may - care attitude might make Adam a bit more adventurous. He could encourage Adam to take risks and explore things that are a bit out of the ordinary. For example, he might introduce Adam to some of the more interesting but less - than - legal aspects of human society, like sneaking into abandoned buildings to see the cool graffiti.