What could be the main plot of a Legend of Chima and Avengers crossover fanfiction?

In the Legend of Chima and Avengers crossover fanfiction, imagine the Hulk in the land of Chima. His huge size and strength would be both an advantage and a source of confusion for the Chima characters. The Avengers, along with their new Chima allies, could face a threat that is causing chaos in both universes. Black Widow could use her stealth skills to gather information in the Chima jungles. Hawkeye might find the Chima bows and arrows very interesting and learn new archery techniques from the Chima warriors. It would be a story full of action, adventure, and unexpected alliances.

One possible plot could be that the ninjas from Ninjago accidentally stumble into the world of Chima while on a mission through a magical portal. They find that the animal tribes in Chima are facing a new threat that they can't handle on their own. The ninjas decide to help, using their unique skills. For example, Kai could use his fire powers to combat an ice - based enemy that the Chima tribes are struggling with. Meanwhile, the Chima characters could introduce the ninjas to their own ways of fighting, like using their vehicles and the power of Chi. This would lead to an exchange of fighting styles and strategies, and in the end, they would defeat the common enemy together and the ninjas would find their way back home.

One idea could be to explore the backstories of the different tribes in Chima more deeply. For example, the Lion Tribe's history of leadership and how it has shaped their values.

Well, perhaps in this fanfiction, there's a multiverse rift that pulls Nightwing into the Avengers' world. The Avengers initially mistake him for an enemy, but after some misunderstandings are cleared up, they realize his skills. Together, they face a new threat created by a combination of Hydra and some of Nightwing's rogues gallery who have also crossed over. Nightwing could teach the Avengers some stealth tactics while they show him how to handle more powerful cosmic threats.

One possible plot could be that the Shikon Jewel gets scattered across the Marvel universe. Inuyasha and his friends, like Kagome, have to team up with the Avengers to retrieve the pieces. Iron Man might be intrigued by Inuyasha's sword and try to study it, while Captain America could admire Inuyasha's fighting spirit. They'd face villains who also want the power of the Shikon Jewel, creating an epic adventure.

One possible plot could be that the Voltron team gets transported to the Avengers' universe. They might initially be seen as threats, but then they realize they need to team up to fight a common enemy, like a powerful alien force that's too much for either group alone. The Voltron lions could combine in the middle of New York City, creating an amazing spectacle.

A really interesting plot could be a time - traveling crossover. Supergirl goes back in time to the era of the original Avengers. She helps them in a battle that changes the course of history. In return, the Avengers help her find a way back to her own universe. During this time, she forms a special bond with Thor, as they both have superhuman strength and a connection to otherworldly powers.

One possible plot could be that the Master Chief is somehow transported to the Avengers' universe. He teams up with Iron Man to stop a new threat that combines Covenant and Hydra technology. Their combined skills in combat and technology would make for an exciting adventure.

One possible plot could be that Superman is somehow transported to the Marvel universe where the Avengers operate. He initially clashes with them due to misunderstandings. For example, his super strength might be seen as a threat. But then they realize they can team up to fight a common enemy, like a powerful alien or a super - villain who has the ability to manipulate time. They combine Superman's powers such as heat vision and flight with the Avengers' diverse skills like Iron Man's technology and Captain America's leadership to save both universes.

It could involve different timelines of the Avengers coming together. Maybe the Avengers from the original team meet their counterparts from an alternate universe where things like Tony Stark never became Iron Man in a different way. They have to team up to fight a common enemy that threatens all the universes.