Maybe in this fanfiction, the worlds of the Avengers and the X - Men collide. This would lead to some really interesting character interactions. Iron Man might be intrigued by the technology in the X - Men's world, while Captain America could struggle with the mutants' different ideologies. It would be a great opportunity to explore how these two groups would interact and whether they could form an alliance.
One idea could be that different versions of the Avengers from alternate universes come together. For example, a more savage Hulk from one world meets the regular Hulk. They could initially fight due to their differences in nature but then realize they need to work together to face a common threat like an all - powerful interdimensional villain.
Another plot could involve the Avengers from our main universe getting trapped in a world where the roles are reversed. So, the villains are the ones in power and the Avengers are the outlaws. They would have to find a way to not only survive in this strange world but also figure out how to restore the balance and get back to their own universe. This would require them to team up with unlikely allies and use their wits and powers in new ways.
In this fanfiction, heroes from different universes might meet. Maybe the Avengers from one world encounter their counterparts from another dimension. It could lead to a lot of chaos as they try to figure out who is who and how to work together.
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 plot idea could be the collision of different Houses' destinies in unexpected ways. For example, a character from House Stark forming an alliance with a former enemy from House Lannister to fight a greater threat like the White Walkers. This would create a lot of drama as they have to overcome their past grudges.
If we consider the cultural differences between the two worlds, it would add an interesting layer to the fanfiction. The Avengers are from a modern, Western - influenced world where science and reason are highly valued. Magnus Chase's world is steeped in Norse mythology and ancient traditions. When their worlds collide, there could be misunderstandings at first. But as they get to know each other, they could learn from one another. The Avengers could learn about the power of magic and ancient wisdom from Magnus, and Magnus could learn about the power of teamwork and modern technology from the Avengers.
Culturally, there would be a huge clash. The Avengers are from different parts of Earth, with different values and beliefs. Crowley, on the other hand, comes from a world of demons and magic. His actions and motives would be completely foreign to the Avengers. For example, Crowley's casual attitude towards death and destruction might horrify the Avengers, who are dedicated to protecting life.
Most likely, the main characters would be the Avengers we all know, like Iron Man, Captain America, Thor, etc. But since it's about two worlds colliding, there could also be new versions of these characters from the other world.
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.
One idea could be exploring the family dynamics when the Avengers have to take care of a young superhero in training. It would be fun to see how they each contribute to the kid's growth, like Tony Stark teaching about technology and Captain America instilling values.