Maybe in the fanfiction, the multiverse is collapsing and the Avengers of different universes are brought together by a mysterious force. They find out that an experiment gone wrong in one of the universes has caused this. So they have to travel through different universes, each with its own unique versions of the Avengers and villains. Along the way, they discover new powers and abilities that they can use to try and reverse the damage and save the multiverse.
A plot could involve a villain who has the ability to jump between universes and is stealing the most powerful artifacts from each universe's Avengers. The Avengers from various universes then come together to hunt this villain down. They face challenges like not being able to use their powers in certain universes because the laws of physics are different. As they chase the villain, they also learn about the different cultures and histories of the various universes.
Well, a cool plot for 'Avengers Multiverse Fanfiction' might be that in one multiverse, the Avengers are all villains and in another they are heroes as usual. The good Avengers from our known universe have to find a way to either convert or defeat their evil counterparts. Maybe there's a mysterious force that's causing this flip in morality across the multiverse and the Avengers need to stop it before it spreads further.
Maybe there's a character who has the ability to traverse different universes freely in this 'the multiverse at war fanfiction'. Their journey to find a way to end the war by uniting the different versions of heroes from various universes would be really engaging. They might face challenges like different versions of the same villain trying to stop them.
One idea could be exploring alternate versions of the main characters. For example, a version of Doctor Strange who turned to the dark side in another universe. Another plot could involve a love story between two characters from different universes that was not possible in the main MCU timeline. Or perhaps a story where the multiverse is collapsing and the characters have to find a way to stop it by traveling through various strange and dangerous universes.
One idea could be that the main character from the Arrow universe gets transported to different multiverse versions where he encounters various versions of female characters who are all attracted to him. They could form a sort of team to fight a common threat across the multiverse while also dealing with their complex relationships.
Well, a plot could revolve around a young inventor in a parallel universe who discovers a way to communicate with the original Mega Man. Together, they try to find a solution to a virus that is spreading across multiple Mega Man universes, corrupting all the robotic beings. This would involve lots of action, as they have to fight their way through hordes of corrupted robots while also searching for a cure.
Perhaps a plotline where the Avengers from different universes have different moral compasses. Some might be more ruthless in their methods of dealing with the multiverse collision. This could lead to internal conflicts within the newly - formed multiverse Avengers team. They would have to figure out how to work together despite their differences while also trying to save all the universes involved.
One interesting idea is the crossovers between different characters from the MHA universe and other universes. For example, seeing Deku interact with characters from other popular anime like Naruto or One Piece can create really unique and exciting storylines.
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.
One idea could be that the mutants and the Avengers have to team up against a common enemy that is immune to their individual powers. So they must learn to combine their abilities in new ways. For example, Wolverine's healing factor could be used to keep an injured Avenger alive during a long battle while Iron Man figures out a way to defeat the enemy.
One idea could be that Harry Potter is magically transported to the Avengers' universe. He could use his magic to help the Avengers in battles, like creating protective shields with spells. Another idea is that the Avengers are somehow sent to Hogwarts, and they have to learn about magic while also dealing with threats in the wizarding world. For example, Iron Man might try to figure out how to integrate his technology with magic.