In such a fanfiction, there would be a lot of culture clashes. The Avengers are used to their Earth - based battles and technology. When they meet the Star Wars characters, they'd have to adapt. For example, the Hulk might not understand the concept of the Force at first and just smash things around. But then, he could learn to use it in his own way. The Star Wars characters would also be shocked by the Avengers' powers. Luke Skywalker might be inspired by Iron Man's suit and try to create something similar for himself.
One idea could be that the Infinity Stones somehow open a portal to the Star Wars galaxy. The Avengers find themselves in the middle of a battle between the Jedi and the Sith. They have to choose sides. Another idea is that a powerful villain from the Star Wars universe comes to Earth, and the Avengers team up with Star Wars heroes to defeat it. For example, Darth Vader could be a threat to Earth, and the Avengers and Luke Skywalker work together to stop him.
In Star Wars Avengers fanfiction, the 'hidden - heritage' trope can be seen often. Maybe a character discovers they have a connection to the other universe in their family history. The 'redemption' trope is also popular. A villain from one universe might find redemption by helping the heroes of the other universe. And let's not forget the 'love - across - universes' trope, where characters from Star Wars and Avengers fall in love despite their different origins.
One interesting crossover could be a story where the Jedi from Star Wars meet the Avengers. Maybe the Jedi could teach the Avengers about using the Force, and in return, the Avengers could show the Jedi some of their high - tech gadgets. Another could be a battle scenario where the Sith Lords team up with some of the Avengers' villains like Loki, creating a chaotic and epic showdown.
A really cool way is to be a new recruit in the Rebel Alliance or the Imperial forces. This way, you get to meet a whole bunch of different characters, from the leaders to the foot soldiers. You can experience the internal politics, the battles, and the camaraderie. And of course, you'll have plenty of opportunities to interact with the main characters like Princess Leia or Darth Vader, depending on which side you're on.
Another concept is that a new threat emerges that requires both the skills of the Avengers and the powers of the Star Wars characters. This new enemy could be a powerful being that can manipulate time and space. The Avengers' superhuman abilities combined with the Jedi's connection to the Force would be needed to defeat it. Black Widow could use her espionage skills to gather intelligence within the Star Wars universe, while Spider - Man (if he's part of the Avengers in this fanfic) could use his agility to navigate the complex terrains of different Star Wars planets.
A possible plot is that Thanos discovers the power of the Force and decides to get his hands on it. He teams up with some of the Sith Lords in the Star Wars universe. The Avengers then join forces with the Jedi and the Rebels to stop this new, even more powerful threat. Spider - Man could use his agility in the zero - gravity environments of some Star Wars planets, and Hulk could be a force to be reckoned with against the Sith's dark side powers.
In some fanfictions, you might see Kanan Jarrus training the Avengers in lightsaber combat. Since the Avengers have different fighting styles, learning the elegant and precise art of lightsaber fighting would add a new dimension to their skills. Also, imagine Thrawn strategizing against the Avengers. His brilliant military mind would pose a great challenge to the heroes.
One common theme is the clash of different cultures. The Avengers come from a modern, Earth - based setting, while Star Wars has its own unique galactic cultures. So, in many fanfics, you'll see characters trying to understand and adapt to these differences.
It provides a rich source of inspiration. Legends had many unique species, planets, and technologies that can be incorporated into canon - based fanfiction. This can add depth and variety to the stories.