Another idea is that the Avengers' time - traveling adventures somehow cross paths with Good Omens' apocalyptic timeline. The Avengers could accidentally end up in the middle of the Good Omens' end - of - the - world scenario. They might try to use their technology and powers to stop the apocalypse in the Good Omens universe, while Aziraphale and Crowley are both amused and a bit confused by these new, powerful visitors.
One interesting plot could be Spiderman getting caught in the middle of an Avengers' internal conflict. Maybe there's a disagreement among the Avengers about how to handle a new threat, and Spiderman has to use his unique perspective and abilities to try and bridge the gap. For example, Iron Man might want to use high - tech solutions that could endanger civilians, while Captain America is more focused on protecting the people first. Spiderman, being a street - level hero, can relate to both sides and tries to find a compromise.
One plot idea could be that Aziraphale and Crowley from Good Omens get dragged into a case that the Winchester brothers are investigating in Supernatural. Maybe it's a demon that's a bit too powerful for Sam and Dean, and they need the help of the angel and demon duo who have a different approach to dealing with the supernatural. Another idea is that the two universes' versions of Heaven and Hell start to merge, and characters from both shows have to figure out how to stop it while also dealing with their own personal issues.
One interesting pairing could be Dean Winchester and Crowley. Dean has a lot of experience dealing with demons in the Supernatural world, and Crowley has his own unique charm and deviousness. Their interactions would be full of witty banter and power plays. Another pairing could be Sam Winchester and Aziraphale. Sam is the more intellectual of the Winchester brothers, and Aziraphale is an angel with a vast knowledge of the cosmos. They could have deep conversations about morality and the nature of good and evil.
One plot idea could be that the characters from Good Omens and Homestuck find themselves in a shared alternate universe. The angels and demons from Good Omens might be quite confused by the strange and complex world of Homestuck, while the Homestuck characters could be intrigued by the celestial beings. For example, Crowley could team up with a Homestuck troll to outwit some overzealous angels. Another idea is a crossover where they have to solve a mystery that spans both their universes. Maybe a powerful artifact has been stolen and its pieces are scattered across both worlds, forcing the characters to cooperate despite their differences in nature and origin.
I think Loki and Crowley would be quite the unlikely allies. Loki is known for his trickery and self - serving nature in the Avengers universe, and Crowley from Good Omens is also a demon who loves to cause a bit of chaos. They could team up to play pranks on both the Avengers and the forces of Heaven and Hell from Good Omens. Maybe they'd create illusions to mislead everyone and have a good laugh while doing it.
One idea could be that Crowley from 'Good Omens' and Lucifer from 'Lucifer' meet in a neutral realm. They start off as rivals, each thinking they are the most devilish. But as they interact, they realize they have more in common than they thought. Maybe they team up to play a prank on some self - righteous angels, which goes awry in hilarious ways.
One common plot could be Aziraphale and Crowley using their flying abilities to go on secret adventures. For example, they might fly to a hidden place on Earth that only they know about to avoid the interference of both Heaven and Hell.
One interesting plot could be the animal avengers having to deal with a new villain that can control the weather. The animals would have to use their unique abilities, like the birds flying into the eye of the storm to disrupt the villain's control. Another plot might involve the animal avengers trying to protect their forest home from humans who want to cut it down for development. They could form alliances with other forest creatures and use their wits to outsmart the humans. And there could also be a plot where the animal avengers discover a magical item in the forest that gives them new powers, but they also have to face the danger of it being stolen by an evil group of animals.
Perhaps in this fanfiction, there is a new member who has the power to heal emotional wounds. The Avengers initially don't trust this new person, but as they face challenges that test their mental and emotional strength, they come to realize that this new member is crucial to their team. This new member helps them deal with their past traumas and makes the team stronger than ever.
Some Good Omens 2 fanfiction delves deeper into the angelic and demonic hierarchies. It might explore how Aziraphale and Crowley interact with other angels and demons in a more complex way. There could be political intrigue among the celestial and infernal beings, and our favorite duo has to navigate through it while also dealing with their own feelings for each other.