I'm not sure of a specific title off the top of my head, but you can look for ones where the characters get into absurd situations. For instance, fanfics where the Ghost crew has to participate in a local alien talent show on a strange planet. It could be full of funny attempts at performing and dealing with the odd rules of the show.
One funny moment could be when Chopper, the droid, plays a prank on Ezra. Maybe he switches Ezra's lightsaber with a fake one that makes a funny noise instead of the usual hum when activated.
Yes, imagine a rebel character who has a pet creature. One day, the pet eats something it shouldn't and starts making fart - like noises. The rebel tries to hush the pet but the other rebels can't help but laugh. It becomes a running joke in their group for a while.
One funny moment could be when Ezra tries to use the Force in a really clumsy way. For example, he might be trying to levitate a small object but ends up making a huge mess instead. The other characters' reactions to his blunders are always a source of humor.
Some Star Wars Rebels time travel fanfics focus on the relationships between the characters. When time travel is involved, characters may interact with their past or future selves. This can lead to some really interesting character development, like Kanan having to come to terms with a future version of Ezra who has changed a great deal due to his time - traveling experiences.
One great Sabine and Ezra fanfic could be one where they go on a secret mission together. It might explore their growing bond as they face challenges. Maybe they have to infiltrate an Imperial base, and along the way, they learn more about each other's pasts. Their different skills, Sabine's artistry and combat skills and Ezra's connection to the Force, would make for an interesting dynamic during the mission.
Well, Galen Marek in a Star Wars Rebels fanfic might be a bit of an anachronism at first glance. But if you think about it, the Star Wars universe is vast. He could have been in hiding for years. In the context of Rebels, he could be a force for change. He might be drawn to the Rebellion's cause because of his own experiences with the Empire's cruelty. His presence could also attract unwanted attention from the Empire, leading to some tense moments in the fanfic. For example, the Inquisitors might sense his power and start hunting him, which could then put the Rebels in danger as they try to protect him.
One great Ezra and Sabine fanfic is 'Bonding on Lothal'. It really delves into their relationship during the Rebellion on Lothal. The author does an amazing job of showing how they rely on each other and grow together as characters.
One similar fanfic could be 'Endless Struggles in the Rebellion'. It also focuses on the hardships that the Star Wars Rebels characters face. Another might be 'Troubled Times for the Ghost Crew' which, like the one you mentioned, likely has the crew dealing with one problem after another. There's also 'Perils of the Rebellion' which would probably have a similar theme of the rebels constantly facing difficulties.
One aspect could be the Rebels' reactions to the complex political situations in the Clone Wars. They might be shocked or inspired by the different alliances and betrayals that took place. It could also show how the Clone Wars era influenced the technology and weaponry available during the Rebels' time, like how the Rebels might see the evolution of starfighters from the Clone Wars to their era.