One possible storyline could be that the Avengers are under some form of mind control. Maybe a powerful villain has manipulated them into believing Tony is a threat to the world. So, they start to target him, causing both physical and emotional harm. For example, they might break into his workshop and destroy his latest inventions, which are not only his creations but also his passion.
Another storyline could be that they get involved in training the next generation of superheroes or tech - savvy individuals. They realize the importance of passing on their knowledge and skills. Tony could teach about advanced engineering and Pepper could offer her business and leadership expertise. This would be their way of ensuring a better future for the world.
A possible storyline could be a technology exchange. Tony is always eager to get his hands on new tech, and Wakandan technology is extremely advanced. So, he could visit Wakanda to learn about vibranium and its applications. T'Challa, in turn, might be interested in Stark Industries' clean energy solutions. This could lead to a series of events where they work together to improve both their technologies and in the process, form a strong friendship.
One possible storyline could be that Anakin, under the influence of the dark side, accidentally uses too much force during a training session with Ahsoka, physically hurting her. This could lead to a rift in their relationship as Ahsoka struggles to understand what happened and Anakin feels guilty.
One possible storyline could be a misunderstanding. Maybe Nami thinks Luffy has made a deal that endangers the crew without realizing his true intentions. So, in her anger and worry, she accidentally hurts him while trying to stop him from doing something she believes is wrong.
Perhaps in the fanfiction, Kakashi is influenced by a dark power. This power corrupts his mind and makes him turn on Naruto. It could be related to some ancient curse or a new enemy's ability that targets Kakashi's mental state. Naruto, being the target, would then be at the mercy of Kakashi's attacks, creating a lot of drama and conflict in the story.
In some fanfictions, Sasuke might be in a situation where he has to choose between his goals and Sakura. His choice could end up hurting her. For instance, he decides to go on a very dangerous mission alone, knowing that Sakura is deeply in love with him and would be worried sick. His disregard for her feelings in this case is a form of emotional hurt. Also, there could be a scenario where Sasuke is forced to fight against Sakura in a misunderstanding, and his superior skills end up causing her serious injuries.
One interesting storyline could be Tony Stark leading the Avengers in a battle against a new, powerful alien threat that has technology far beyond Earth's. He'd use his genius to analyze the enemy's tech and come up with strategies on the fly. Another could be him dealing with internal conflicts within the team while still trying to keep them focused on protecting the world. Maybe a member has a personal vendetta against a villain that could put the whole mission at risk, and Tony has to step in as leader to resolve it.
One possible storyline could be that Tony Stark is killed in a battle against a new, extremely powerful villain. Maybe this villain has technology that can neutralize Tony's Iron Man suit and finally defeat him. Another could be a self - sacrifice situation, like in the original story, but this time he doesn't survive the sacrifice. For example, he might fly a bomb into outer space but the explosion is too much for him to handle.
In some fanfictions, he could die as a result of a long - term undercover mission gone wrong. He gets too deep into the criminal underworld and is ultimately betrayed by someone he thought he could trust. His death shocks everyone, and the team has to deal with the guilt of not being able to protect him while also trying to take down the people responsible.
One possible storyline could be that Tony gets shot during a routine investigation. His team then races against time to find the shooter while also trying to keep Tony alive. They discover it's part of a bigger conspiracy against the NCIS. Another could be that the shooting is a personal vendetta from an old case. His friends at NCIS have to dig deep into his past to figure out who would want him dead. And finally, perhaps he gets shot while protecting a witness, and the witness holds the key to his survival as well as the key to solving a major crime.