One plot idea could be Fives and Ahsoka teaming up to uncover a hidden Sith plot within the Jedi Order. They might start noticing strange behavior among some Jedi and use their unique skills to dig deeper.
A great plot could involve Fives and Ahsoka getting stranded on an unknown planet. They have to work together to survive, learn about the planet's secrets, and find a way back home. This would test their friendship and abilities. They could encounter new species and face various challenges along the way.
Perhaps a plot where Fives has a premonition about Ahsoka's future. He tries to warn her, but she is skeptical at first. As events unfold, they realize that there is a greater force at work trying to manipulate Ahsoka's destiny. They then fight against this unknown force, using their bond and determination to change what seems to be a fated outcome.