Another plot could involve a crossover with the Mandalorian. The Mandalorian's no - nonsense attitude and his unique set of skills could add a new dynamic to the Rebels' fight. He could team up with Kanan and teach him some Mandalorian combat techniques while also learning about the Rebellion's cause.
One idea could be a crossover with the original Star Wars trilogy characters. For example, having Luke Skywalker meet the Rebels crew and learn from their guerilla warfare tactics against the Empire. It would be exciting to see how their different fighting styles blend and how they interact with each other.
One plot idea could be that a character from Clone Wars gets accidentally sent to the time period of Rebels. For example, Ahsoka Tano could end up in the middle of a battle between the Rebels and the Empire. She might use her knowledge from the Clone Wars era to help the Rebels in unexpected ways, like teaching them some old Jedi combat techniques that were lost over time.
Perhaps there could be a lost Mandalorian artifact that the Rebels accidentally discover. This draws the attention of a group of Mandalorians who think the Rebels are trying to steal it. As a result, they have to work together to figure out the true purpose of the artifact and face off against a common enemy who also wants it for their own evil plans.
There are several great plot ideas. For instance, imagine a situation where Yoda, before his death, set in motion a series of events that are only starting to unfold during the Rebels' time. Maybe he planted the seeds for a new Jedi order in a very secretive way. A young Rebel might stumble upon these secrets. Another idea is that Yoda's teachings, which were thought to be lost, are rediscovered by the Rebels through an ancient Jedi artifact. This discovery changes the way they approach the fight against the Empire. And what about a story where Yoda's influence reaches out to a non - Force - sensitive character in Rebels, inspiring them to do great things for the Rebellion in a different way?
One idea could be that Master Chief somehow gets transported to the Star Wars Rebels universe. He could team up with the Ghost crew. His advanced combat skills and Spartan armor would be a huge asset against the Empire. Maybe he'd share his knowledge of advanced weaponry with the rebels.
A fanfiction could revolve around Echo's memories. He has flashbacks to his time in the Clone Wars that end up providing valuable insights for the Rebels. For example, he remembers a weakness in a type of Imperial droid that the Rebels are currently facing. This not only helps them in battle but also makes the Rebels see Echo as a valuable asset.
One idea could be a crossover with the original Star Wars trilogy characters. Maybe the Rebels crew teams up with Luke Skywalker and Han Solo to take on a new, powerful Sith threat. This would bring together the scrappy underdog feel of the Rebels with the classic heroism of the original trilogy.
Well, a cool plot could involve the Rebels finding the Omnitrix. Maybe Ezra discovers it and accidentally activates it, transforming into different Ben 10 aliens. This would be a huge advantage for the Rebels but also a bit of a problem as they try to figure out how to control the transformations. And Ben could show up trying to get his Omnitrix back, but then decides to stay and help the Rebels fight the Empire.
One interesting plot could be Naruto and his friends getting stranded in the Star Wars Rebels universe. Naruto's ninja skills would be quite a shock to the Rebels. He could use his shadow clone jutsu to create distractions during battles against the Empire. His ability to harness chakra might be seen as a new form of the Force by some characters, leading to some interesting exchanges about power and its uses.
One possible plot could be that Master Chief somehow gets transported to the Star Wars Rebels universe. He teams up with the rebels to fight against the Empire. His advanced armor and combat skills would be a great asset. Maybe he has to face off against Imperial Inquisitors and uses his Spartan training to outwit them.
A character could experience a moral transformation. A former Imperial who has joined the Rebels might start to transform back to his old ways due to the stress and hardships of the Rebellion. This internal struggle could be a central part of the fanfiction. The other Rebels would then have to decide what to do with him - try to reform him again or cut their losses. It would show the complex nature of the Rebels' cause and the different types of people it attracts.