What are some interesting plot ideas in 'fallen angel avengers fanfiction'?

One idea could be that a fallen angel is sent to the Naruto world to retrieve a powerful artifact that has been lost there. Naruto, being the curious and heroic type, gets involved and they end up having to team up. Another could be that the fallen angel is on the run from some other celestial beings and Naruto offers her protection in his village. A third idea is that the fallen angel has some unique powers that Naruto wants to learn from to become stronger in his fight against the Akatsuki.

A great plot could be that the fallen angel is mistaken for a villain at first. As the story progresses, it's revealed that they are actually trying to stop an ancient evil that is about to be unleashed in the My Hero Academia universe. They have to convince the heroes to trust them despite their appearance and strange powers.

A good plot for Highschool DxD fallen angel OC fanfiction could start with the OC being hunted by a group of vengeful angels. As they run, they end up in the territory of the devils and have to make a deal with them to survive. Along the way, they fall in love with a devil, which creates a whole new set of problems as their two worlds collide. Or, the OC could be trying to solve a mystery that dates back to the very beginning of their fall, something that involves a prophecy that only they can fulfill.

One interesting plot could be a fallen angel trying to regain its former status. For example, it might embark on a series of heroic deeds in the human world to prove its worth to the celestial realm again.

You could write a fanfiction where the Angel Blade has a mind of its own. It communicates with the wielder in a mysterious way, guiding them towards a greater purpose. The story could then revolve around the wielder trying to understand the blade's intentions, while also dealing with external conflicts like battles against dark forces and political intrigue within their own group.

A really cool plot idea could be that the Avengers are watching Endgame in a sort of 'alternate reality cinema' where the events in the movie start to bleed into their real world. So they have to stop the movie from fully playing out to prevent chaos in their own universe. This would involve a lot of action and strategic thinking as they try to stop things like Thanos from emerging from the screen while also trying to understand the significance of what they're seeing in the movie.

Obviously, the fallen angel would be one of the main characters. It could be a character with a tragic backstory, like they were cast out of heaven for trying to protect humanity in a way that was against the celestial rules. The Avengers, such as Iron Man, Captain America, and Thor, would also be main characters as they interact with the fallen angel.

Well, you could make your fallen angel OC a bit of an outcast even among other fallen angels. Maybe they have a different view on the war between angels and devils. For example, they could be trying to broker peace in secret. They might also have a special connection to a certain sacred object that was lost during their fall, and the story could revolve around finding it again. Also, giving them a distinct personality trait like being overly curious about human culture could lead to some fun and unique storylines.

Perhaps the fallen star is a symbol of a lost civilization. In the fanfiction, a young adventurer discovers the star and tries to unlock its secrets, which could lead to adventures across different realms and facing various ancient guardians.

One idea could be Batman using his detective skills to uncover a hidden threat that the Avengers initially overlook. For example, he might notice some small, seemingly insignificant details during a battle scene that lead him to a much larger conspiracy.