One great 'Good Omens' fanfic is 'The Ineffable Wives'. It offers a really interesting take on the characters, exploring their relationship in a new light. It has some beautifully written dialogue that stays true to the tone of the original series.
Well, in the original 'Good Omens', dancing was not really a central theme. But in the 'angels don't dance good omens fanfic', it becomes a crucial element. It might change the way the characters interact. For example, Aziraphale and Crowley's relationship might be explored in a new light as they can't use dancing as a form of connection like they might in other interpretations.
Sure. 'The Ineffable Bureaucracy' is a great one. It focuses on the relationship between Gabriel and Beelzebub in a really interesting way, adding more depth to their characters outside of the main story.
The 'Good Omens' fandom is very passionate. Fans love the series so much that they want to contribute their own stories. They can use fanfic to fix things they thought could have been better in the show, or to expand on ideas that were only briefly touched upon. There's a sense of community within the fandom, and sharing and reading fanfic is part of that.
In some fanfics, Big Brother Gabriel is given a backstory that makes him more relatable. For example, he might have had a difficult time growing up in the celestial realm, facing certain challenges that shaped his personality. This could lead to different interactions with characters like Aziraphale and Crowley. He might be more sympathetic towards their relationship, or he could be even more determined to stop it depending on how the author wants to spin the story.
His pride is also a characteristic that is sometimes emphasized. He believes in the superiority of Heaven and its ways, and this pride can lead to conflicts with other characters. He may look down on Aziraphale for his friendship with Crowley, seeing it as a betrayal of Heaven's values. However, in some fanfics, this pride can also be his downfall as he fails to see the changing tides in the eternal battle between good and evil.
I would recommend 'The First Meeting Reimagined'. It's a short and sweet fanfic that focuses on a key moment in the 'Good Omens' lore, the first meeting between Aziraphale and Crowley. It's written in a very accessible style and can help new fans get a feel for the characters' personalities.
You can try some popular fanfic platforms like Archive of Our Own (AO3). There are a large number of fanfics there, and you can use the search function to specifically look for 'good omens x reader' ones. It has a wide variety of works, from different genres and with different writing styles.