There's a fanfiction called 'Crossed Fates in the Stars'. In this one, the Spartans from Halo and the rebels from Star Wars Rebels meet. The story is detailed and full of action. It shows how the different technologies and cultures interact. For example, the energy shields from Halo and the lightsabers from Star Wars create some really exciting fight scenes. It also delves into the characters' moral compasses and how they deal with the new situations they find themselves in.
One idea could be a crossover where the Rebels' technology somehow gets mixed with Halo's. For example, the Rebels might discover a Halo ring and try to figure out its purpose while also dealing with Covenant forces. Maybe Ezra could use his Force abilities in new and unexpected ways against the alien threats.
One great 'Star Wars Rebels Luke' fanfiction is 'Luke's Hidden Journeys'. It delves into Luke's experiences during the Rebels era that are not shown in the main canon. It shows his growth as a Jedi in a new light, with interesting interactions with the Rebels characters.
First, do your research on both universes. Know the characters, the technology, and the lore. For example, in Halo, understand how the Covenant works, and in Star Wars Rebels, know about the Empire and the rebels' fight. Then, create an interesting premise for the crossover. Maybe a shared threat or a scientific experiment gone wrong.
A really interesting 'Halo and Star Wars Clone Wars Fanfiction' is 'The Jedi and the Spartan'. In this story, a Spartan meets a Jedi and they start to learn from each other. The Spartan shows the Jedi some of the advanced combat techniques from Halo, while the Jedi teaches the Spartan about the Force. It's fascinating to see how the two different power systems and cultures interact. There are also some great action scenes where they fight together against common foes, and the author does a great job of describing the different weapons and abilities from both universes.
There is a really cool 'Star Wars Rebels' fanfiction titled 'Sabine's Secret Missions'. It reveals some hidden operations that Sabine was involved in during the Rebellion. It has great action scenes and also shows a different side of Sabine's character. Additionally, 'The Inquisitor's Origins' is a fanfiction that digs deep into the backstory of the Inquisitors in the Rebels universe, which is very fascinating.
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.
When writing dialogue, make it true to the characters. If Kanan is talking to a Spartan, he should still have that Jedi wisdom in his words. And for the action scenes, blend the different combat styles. Have the lightsaber duels incorporate some of the high - tech weaponry from Halo. Make sure the pacing is good too, not too rushed or too slow. And always be open to feedback to improve your fanfiction.
One great Ezra fanfiction is 'Ezra's New Path'. It delves deeper into his journey after the events of the show. Another good one is 'Ezra and the Lost Force Artifacts' which has him on a quest to find powerful Force - related items. 'Ezra's Alliance' is also worth checking out as it shows his role in building the Rebel Alliance further.
One great 'Ahsoka Star Wars Rebels' fanfiction is 'Ahsoka's New Path'. It delves into Ahsoka's life after leaving the Jedi Order and her experiences in the Rebellion. It shows her growth and how she uses her skills to help the rebels in unique ways.
There's a fanfic called 'Kalluzeb: A New Path'. This one focuses on what happens after the events of 'Star Wars Rebels'. It shows Kallus and Zeb trying to find their place in the new galaxy. It has a lot of character development, especially in how they deal with their pasts and build a future together.