A third storyline could be about the villains who survived or emerged after Infinity War. Maybe some of them see an opportunity to take over in the power vacuum left by Thanos. The fanfic could explore how the heroes have to deal with new threats while still reeling from the events of Infinity War.
A plot might also revolve around the villains. Some villains might see the chaos as an opportunity to take over. The Avengers would then have to deal with new threats while still recovering from the events of Infinity War. The fanfic could show how they come up with new strategies and alliances to face these challenges.
One of the most impactful storylines could be Peter Parker dealing with the loss of his mentor, Tony Stark. In the aftermath of Infinity War, Peter is left without the guidance and support he had come to rely on. This could lead to him struggling with his identity as Spider - Man and his place in the post - Snap world. Another storyline might involve how the remaining heroes look to him as a symbol of hope, despite his own insecurities.
Another plot could focus on Thor. After losing so much in Infinity War, he might become a bit of a recluse. But then he realizes that he has a responsibility to the remaining Asgardians and the universe. So he starts to gather the remaining heroes and form a new plan to fight against the consequences of Thanos' snap.
Captain America could be the main character. He's always been a leader, and in the aftermath, he could be the one trying to hold the remaining Avengers together. He would be dealing with his own sense of loss and responsibility. He might also be trying to figure out how to prevent future disasters like Infinity War.
Nebula is an interesting choice as well. She has a complex relationship with Thanos and has been through a lot. In the aftermath, she could be a key figure in trying to find a way to undo what Thanos has done. Also, her unique skills and knowledge of different parts of the universe could play an important role in the fanfic.
One unusual storyline in a Vision and Scarlet Witch fanfic could be that Vision somehow transfers his consciousness into an alternate form to escape Thanos. This would completely change the dynamic between him and Scarlet Witch as they'd have to adapt to his new existence. It would be a really interesting take on their relationship and how they deal with such a drastic change in Infinity War - related fanfic.
Surely the remaining Avengers like Iron Man, Captain America, and Thor are important. They are likely to be at the forefront of trying to fix things. Also, characters like Black Widow who are strategic thinkers would play a crucial role.
Well, in the 'infinity war aftermath novel', one of the key events is the exploration of how different planets are affected. Some might be in chaos due to the sudden disappearance of half their populations. Also, the relationships between the remaining heroes are strained as they all have different ideas on how to move forward. And there's probably a lot of mystery surrounding Thanos' actions and if there are any lingering threats related to his plan.
One way is through his magical transportation methods. The Floo Network or Apparition could be used to quickly move the Avengers around. Harry could also use his wand to perform healing magic on the injured heroes.
One possible scenario could be that Doctor Strange saw a different future where they managed to stop Thanos before he got all the Infinity Stones. So, the Avengers might have worked together more effectively from the start. For example, they could have sent a team to intercept Thanos on his way to collect the stones on different planets.