One idea could be exploring the psychological impact on the heroes during the Infinity Crisis. For example, how Superman copes with the overwhelming threat and the potential loss of his loved ones. Another could be a story from the perspective of a lesser - known hero who rises to the occasion during the crisis. Maybe they discover a new power or ability that helps turn the tide.
A great plot for an Infinity Crisis fanfic could be about an alternate reality where the villains actually win the Infinity Crisis. Show how the world is ruled by the bad guys and the remaining heroes have to form a resistance. It could involve them having to make difficult moral choices like whether to sacrifice one to save many in their fight against the tyrannical rule.
One idea could be exploring an alternate universe where the main characters have different powers related to dragons. For example, the protagonist could have the ability to communicate telepathically with all dragons instead of just a specific one.
One idea could be exploring how the remaining heroes deal with the loss of half the population on a personal level. For example, Iron Man could struggle with survivor's guilt and pour all his energy into finding a way to reverse it. Another could be about the new friendships formed among the survivors as they realize they have to rely on each other more than ever.
One idea could be a crossover with the Harry Potter universe. The Avengers could travel to Hogwarts in search of a magical relic that could help them in the fight against Thanos. Maybe Doctor Strange uses his magic to open a portal to Hogwarts and they team up with the wizards to defend the relic from Thanos' minions.
One idea could be exploring the backstories of the minor characters in more depth. For example, showing how the Wakandan warriors trained and what their lives were like before the big battle. Another could be a what - if scenario where Thanos actually had a change of heart at the last minute. Maybe he saw the beauty in the universe he was about to destroy and decided to stop.
Another plot could focus on the relationship between Thanos and his adopted daughters in a more in - depth way in the context of the Infinity Wars. Maybe there was a time when they were planning a rebellion against him before he even started his quest for the Stones. This could add a whole new layer of backstory and drama to the events of the movie.
A possible plot could be that Deadpool somehow gets his hands on one of the Infinity Stones before Thanos does. This attracts the attention of Thanos, who then sends his minions after Deadpool. Spider - Man has to protect Deadpool while they try to figure out what to do with the Stone. This leads to a series of wild adventures and battles, with the two heroes learning more about each other and growing as characters.
One idea could be exploring the backstories of minor characters who get caught up in the Crisis. For example, how an ordinary person from a small, unremarkable Earth copes with the multiversal chaos.
One idea could be that Spider - Man discovers a hidden power within himself during Infinity War that allows him to turn the tide of the battle. Maybe he can communicate with the Infinity Stones on a deeper level, using his spider - sense to detect their weaknesses and strengths.
One idea could be that Spider - Man discovers a hidden power within himself during the Infinity War. Maybe he has a unique connection to the Infinity Stones that no one else realizes. This power could help him turn the tide in some crucial battles.
One idea could be Superman teaming up with the Avengers in a way that defies the normal rules of their universes. Maybe he has a unique power that helps them against Thanos, like his super - breath freezing Thanos' army.