In some fanfictions, Ahsoka might save the Jedi Order by uncovering a hidden conspiracy within the Senate that was targeting the Jedi. She could use her skills as a former Jedi and her unique perspective outside of the Order to expose the plot and gain support from key figures to prevent the downfall of the Jedi.
Ahsoka could face the challenge of time. If there is a ticking clock situation where the Jedi Order is about to be destroyed very soon, she has to act fast. And she may not have all the resources she needs. She might need to gather allies, information, and power, but there could be limitations. For example, some Jedi secrets might be lost, and she has to figure out things on her own without the full knowledge of the Jedi traditions, which can slow down her efforts to save the Order.
One possible reason in the fanfic could be her disillusionment with the Jedi Council. Maybe she saw too many of their political games and felt they were straying from the true Jedi path. For example, she might have witnessed them making decisions based on power rather than justice.
Her departure could create a power vacuum in certain areas. Since she was a powerful Jedi, there might be regions she was protecting that now become vulnerable to the dark side or other threats.
Imagine Naruto using his Sage Mode in the Star Wars universe. His enhanced senses and strength would make him a formidable force against the dark side. He could sense the presence of the Sith from afar and launch surprise attacks. And when he teams up with Jedi Knights like Obi - Wan Kenobi or Luke Skywalker, they could come up with amazing battle strategies. Their combined powers would be able to take on the most powerful enemies in the galaxy, and that would be extremely exciting in the fanfiction.
In a Naruto Saves the Jedi fanfiction, it might start with Naruto being transported to the Star Wars universe. His strong sense of justice would immediately align him with the Jedi. He could use his speed and agility, which are honed from his ninja training, to quickly move around the battlefield. His chakra could be seen as a sort of Force energy in that universe. And he would definitely bring his never - give - up attitude, which could inspire the Jedi in their fight against the dark side.
Maybe Harry uses his magic skills like the Patronus charm to protect the Jedi from the Sith. His ability to apparate could also help Jedi in quick escapes.
One possible reason could be disillusionment. In some crossovers, she might see the Jedi Order's flaws more clearly when exposed to different cultures or ideologies from the crossover elements. For example, if it's a crossover with a more individualistic society, she may start to question the Jedi's collectivist approach.
One idea could be a crossover where a Naruto character, like Naruto himself, somehow gets transported to the Star Wars universe of Jedi: Fallen Order. He could learn the ways of the Force while also using his ninja skills. For example, his shadow clone jutsu might be mistaken for a Force ability at first.