A possible plot for this fanfiction could be that the Avengers enter a dimension where time moves at a different pace. For some of them, it's super - fast, and for others, it's super - slow. This would create all kinds of chaos as they try to coordinate and fight against threats in that dimension. Also, they could discover that in this dimension, their memories are being slowly erased, so they have to find a way to stop it while still dealing with the local villains.
In an 'Avengers Another Dimension Fanfiction', a cool plot might involve a dimension where technology and magic are one and the same. So Iron Man's suit could be powered by both arc reactor energy and some sort of magic spell. Or a dimension where the Avengers are part of a gladiator - like arena, and they have to fight not only their usual foes but also other heroes from different universes just to survive and find a way back home.
One idea could be that Peter discovers he has special powers in this other dimension that he doesn't have in his own world. For example, he can control elements like fire or water. Another could be that he meets alternate versions of his friends and family, and has to deal with the differences in their personalities. Maybe in this dimension, his best friend is his enemy.
One idea could be Naruto being transported to a dimension where chakra doesn't exist, but he discovers a new form of energy and has to learn to use it from scratch. This would force him to adapt his fighting style completely.
Well, a cool plot for 'Harry Potter in Another Dimension' fanfic could be that Harry discovers he has a twin in this other dimension. His twin has been raised by Voldemort and has a very different view of the wizarding world. Harry has to find a way to convince his twin to abandon Voldemort's ways. Or, what if in this dimension, the Sorting Hat can talk out loud all the time and gives very different sorting decisions? For example, it might put all the brave students in Slytherin and the cunning ones in Gryffindor. It would be really interesting to explore how the relationships between the houses change.
Another plot could be that Ichigo is transported to a dimension that is a post - apocalyptic world. Here, his skills as a fighter would be put to the test. He might find remnants of a once - great civilization that had technology far different from his own, and he has to use both his swordsmanship and his wits to navigate this dangerous new world.
Another plot could involve a dimension where the Fairy Tail guild has an evil counterpart. Our heroes have to team up with the good versions of their doppelgangers in that dimension to defeat the common evil. They might face challenges in trusting these new allies who look just like their enemies back home.
One idea could be Naruto getting trapped in a dimension where chakra doesn't exist, and he has to learn new forms of power. Another could be a dimension where the Akatsuki are the heroes, and Naruto has to figure out how to co - exist or change that world. Or perhaps a dimension where all the dead characters are alive again, but in different roles, like Itachi as a rogue ninja fighting against Konoha.
One idea could be Naruto traveling to a dimension where all the villains have become heroes. He has to adapt to this new world order and figure out how to get back to his own dimension.
One interesting plot could be Naruto traveling to a dimension where the Akatsuki are the heroes. It would be a complete role - reversal, and Naruto would have to figure out how to interact with them. Another could be a dimension where everyone has a different type of chakra, like water - based chakra for all shinobi, and Naruto has to adapt his skills.
One idea could be that the characters from different dimensions team up to fight a common enemy that threatens all dimensions. For example, Yugi and his friends could join forces with counterparts from a dark dimension who have their own unique cards and strategies. This would lead to some really cool duels and character interactions.
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.