One idea could be that the Avengers themselves get injured during a major battle and are taken to a special hospital. There, they have to deal with not only their physical wounds but also the psychological trauma. For example, Iron Man might struggle with the fear of his suit failing again while in recovery. The doctors and nurses in the hospital could be normal humans who are in awe of the Avengers but also have to keep their professional composure.
Maybe the hospital is secretly run by a villain who is using the Avengers' injuries as an opportunity to study their powers. The Avengers start to notice strange things happening around the hospital, like their powers being drained slightly. Hawkeye could be the first to suspect something is wrong as he is very observant. They then have to figure out what's going on and escape the hospital while still injured.
In the fanfiction, the Avengers could be visiting a hospital to see a young fan who is terminally ill. They end up spending time with other sick children as well. Captain America could inspire the kids with his stories of courage. This visit could also lead to the Avengers funding a new wing in the hospital dedicated to treating superhero - related injuries that normal hospitals are not equipped to handle.
One possible plot could be that a character gets seriously injured during a battle and is rushed to the hospital. While in the hospital, they have to deal with their own fears and insecurities as they recover. Meanwhile, their teammates visit them and there are some heart - to - heart conversations that strengthen their bonds.
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.
Perhaps in the fanfiction, the Avengers reunite for a more personal reason. One of their own, say Tony Stark (even if he's no longer alive in the main timeline), has somehow sent a distress signal from an alternate reality. They come together, not just to rescue him but also to explore this new and strange reality where things are different. They might meet alternate versions of themselves and have to team up with these versions to solve a problem that is affecting both realities.
One idea could be that Bella is a new nurse in the hospital and she discovers a secret patient who has a mysterious illness. She then teams up with a brilliant but reclusive doctor to try and solve the mystery.
Another interesting plot could be a natural disaster hitting the area where the General Hospital is located. The hospital staff has to deal with a large influx of patients, shortage of supplies, and their own personal fears. This would show how they come together, or in some cases, fall apart under extreme pressure.
In this fanfiction, a young medical ninja in training could be struggling to prove herself in the hospital. She has to deal with difficult patients, strict mentors, and the pressure of the constant stream of injured ninjas. One day, a very important and powerful ninja is brought in with a life - threatening injury. This is her chance to shine, but she also has to face her own insecurities and the politics within the hospital.
Obviously, the Avengers themselves would be main characters. Iron Man could be the one who funds the high - tech medical equipment in the hospital. Thor might have a hard time adjusting to the human medical procedures. And Black Widow could be using her espionage skills to find out if there are any threats in the hospital.
A cool plot might involve an enemy that uses both Chakra and Infinity Stones' power. Naruto teams up with the Avengers. The Avengers are amazed by Naruto's ability to use his Nine - Tails' Chakra. Naruto, on the other hand, is in awe of the high - tech weapons and superpowers of the Avengers. They combine their powers and skills, with Iron Man creating special suits for Naruto that can enhance his jutsu, and together they fight the powerful foe.
Perhaps the Avengers mistake one of the Horsemen for a new super - villain. As they engage in battle, they soon realize that the Horsemen is actually after a powerful artifact that a real villain in the Avengers' world has obtained. So they form an uneasy alliance to retrieve the artifact.
Well, one plot could be that fem Percy's water - controlling abilities catch the Avengers' attention. Maybe she accidentally disrupts a city's water supply during a fight with a villain, and the Avengers try to figure out who she is and how to work with her to fix the situation.