Well, it could be really cool. Maybe the Jedi in Star Wars Rebels could team up with the wizards in Harry Potter. For example, Ezra Bridger could meet Harry Potter and they'd exchange their skills. Ezra could show Harry how to use the Force in a more combat - oriented way, while Harry could introduce Ezra to magic spells that could be used for various things like protection or even transportation in a different way than the Force allows.
One idea could be to have a wizard from the Harry Potter universe accidentally end up in the Star Wars Rebels' galaxy. Maybe they use their magic to help the rebels in unexpected ways, like creating magical shields or using apparition to outmaneuver the Empire's forces.
A great idea for an Echo x Star Wars Rebels crossover fanfiction would be that Echo has some sort of encrypted data in his cybernetic enhancements that could be crucial for the Rebels. The Rebels have to figure out a way to access it without harming Echo. This could lead to a lot of character - development moments as they get to know Echo and his past better, and Echo gets to adapt to the Rebels' way of doing things.
There are some really interesting crossovers in the fanfiction world. One might imagine Jedi from Star Wars Rebels visiting Hogwarts in the Harry Potter universe. It could be a great story where the Force meets magic.
I think pairing Kanan Jarrus and Dumbledore would be really interesting. Dumbledore is this wise and powerful wizard, and Kanan is a Jedi with his own set of skills and knowledge. They could have deep discussions about leadership, the nature of good and evil, and how to train the younger generation. Kanan could learn from Dumbledore's teaching methods when it comes to mentoring Ezra, and Dumbledore could gain insights into the Force from Kanan.
Well, in some fanfictions, you might see the Death Star being infiltrated by Hogwarts students using their magic skills. They could use invisibility cloaks to move around undetected and use spells to disable the security systems. Also, the idea of a lightsaber duel between a Star Wars character and a Harry Potter character who uses a magically enhanced sword could be really cool. It would be a clash of two very different but equally powerful combat styles.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). Just search for 'Star Wars Rebels Harry Potter crossover' and you should get a list of relevant stories.
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.
There probably is. Fans are very creative when it comes to mashing up different fictional universes. In a 'Harry Potter Master of Death' and 'Star Wars' crossover, you might see things like Harry using his magic in the Star Wars galaxy, or Jedi dealing with the concept of the Deathly Hallows. It would be a wild and exciting mix of two very different yet equally beloved franchises.
They could meet during a space - time anomaly. For instance, Hermione could be pulled into the Star Wars Rebels' universe. She would use her intelligence and knowledge of magic to assist the rebels in their fight against the Empire. She might start by analyzing the Empire's technology with a magical perspective, which could give the rebels an edge.