What are some interesting plot ideas for Avenger's Endgame fan fiction?

Iron Man is a very popular choice. His sacrifice in the movie was so impactful that many fans like to explore alternate endings where he survives or different scenarios leading up to his death. They might write about his relationship with Pepper Potts in more detail or his interactions with the other Avengers in a different light.

One idea could be a new character joining the Avengers. For example, a young mutant with the power to control time. This character could accidentally disrupt the timeline while trying to prove themselves to the team, leading to all sorts of chaos and adventures as the Avengers try to fix it.

Another plot could involve a new threat emerging that is related to the events of Endgame. The team has to piece together clues from the past events to stop this new danger. They might discover secrets that were hidden during Endgame that could change everything.

One idea could be a crossover with the Doctor Who universe. The Avengers could team up with the Doctor to fight a common enemy that threatens both their universes. Maybe Thanos somehow gets access to Time Lord technology and the combined forces have to figure out how to stop him from using it to rewrite all of reality.

Perhaps a fanfiction where the Infinity Stones in the Endgame have an unexpected effect on certain anime characters. These characters start to develop new abilities or forms that are a blend of their anime selves and the power of the Stones. This could lead to a whole new dynamic in the fight against Thanos, as the Avengers have to figure out how to work with these newly - empowered anime allies.

One idea could be an OC who has the power to time - travel in a unique way, not like the Avengers' method. They could accidentally disrupt the events of 'Endgame' further while trying to help. For example, they might create alternate timelines where different villains gain power. Another plot could involve an OC who is a long - lost relative of one of the Avengers. They show up during the final battle and use their hidden powers to turn the tide. And a third idea is an OC who is from a different dimension entirely and has knowledge of how to defeat Thanos more easily, but they have to convince the Avengers to trust them first.

A plot could involve the Avengers traveling to different dimensions through the disks and having to team up with alternate versions of themselves to defeat a common enemy. This would bring in a lot of interesting character interactions and new power combinations.

One idea could be exploring what if a minor character from the movie got the Infinity Stones instead. For example, a random Asgardian warrior. They might use the power in a completely different way, perhaps trying to restore Asgard rather than the more universal aims Thanos had.

One idea could be that new, mysterious creatures arrive on Nim's Island. Nim has to figure out where they came from and if they pose a threat. Maybe they are friendly but misunderstood, like the new animals could be some kind of magical beings that only come out at night and Nim has to learn their language to communicate with them.

One idea could be a story where a long - lost relative of one of the main characters shows up at the hospital. This new character could bring a whole new set of family drama and secrets. Another plot could be about a patient who has a very rare and mysterious illness that the doctors struggle to diagnose. It would be a great opportunity to show the doctors' determination and teamwork. And a third idea could be a time - travel story where a character goes back in time to when they first started at the hospital and has a chance to change some of the things that went wrong in their life.