One plot idea could be that the Avengers are somehow transported to the Star Wars universe. They have to team up with the Jedi or the Rebels to fight a common enemy, like a new Sith Lord who has powers similar to some of the Avengers' villains. Another idea is that the Infinity Stones are discovered in the Star Wars galaxy and both the Avengers and Star Wars characters have to figure out what to do with them.
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.
One idea could be that in the fanfiction, instead of Thanos getting all the Infinity Stones, the Avengers manage to steal some of them first. They could then use the power of the stones they have to create alternate versions of themselves to fight on different fronts against Thanos' forces.
A really interesting plot could be based on the idea of time travel within the context of 'The Avengers Infinity Wars' fanfiction. What if the Avengers found a way to go back in time and change certain events that led to Thanos getting the Infinity Stones? They could try to prevent the destruction of Xandar where the Power Stone was first retrieved, or stop Loki from stealing the Tesseract on Earth, which was a crucial step in Thanos' plan.
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.
One idea could be exploring the origin of a new, mysterious force - user in the Shadow Wars. Maybe it's a forgotten Jedi or Sith technique that resurfaces and causes chaos. Another could be focusing on the relationship between a group of rebels and how they deal with the added threat of the Shadow Wars.
A great plot for Star Wars The Clone Wars fanfiction could be centered around a new, unknown planet that gets caught in the middle of the war. The planet has its own unique species and culture. The story could follow how the clone troopers and the Jedi interact with this new civilization, whether they try to protect it or use it for their own strategic advantages. Or perhaps a story where a group of clone troopers start to develop their own individual personalities and question their loyalty to the Republic due to some unethical orders they receive. This could lead to a conflict within the clone ranks and force the Jedi to take sides.
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.
One idea could be exploring the backstory of the apprentice before they met their master. Maybe they had a family on a far - off planet that was destroyed, which led them to seek power. Another could be a story where the apprentice has to choose between loyalty to their master and doing what they believe is right. For example, if their master orders them to destroy an innocent village, they might rebel.
One idea could be that the triplets are force - sensitive and are secretly trained by an old Jedi master in hiding. They grow up to be a powerful force against the dark side.
One idea could be a story where a god - like being from another dimension enters the Star Wars universe and has to choose a side in the galactic conflict. Maybe this being has the power to manipulate the Force in ways no Jedi or Sith has ever seen before.