Maybe Sidious is trying to say that it's not just a simple fictional story. It could imply that the events related to him are real in the Star Wars universe in a sense. Like his rise to power, his manipulations, are all very real threats and not something to be dismissed as a made - up tale.
Maybe Palpatine sees Ezra as a potential tool or apprentice at first. He tries to manipulate Ezra into joining him. Ezra, on the other hand, is conflicted because he might see some good in Palpatine's grand plans for the galaxy, but eventually realizes the cost of following the dark side. Their relationship would be a complex dance of manipulation and resistance.
Maybe some of the Jedi Council members. They were the ones who were constantly in conflict with Palpatine's plans, so they could be in the story to show the power struggle between the Jedi and Palpatine.
Well, Palpatine's background is filled with secrecy and deception. He was a master of political manipulation and used his Sith powers in the shadows to gain control. His early life was marked by his apprenticeship under Darth Plagueis and his plotting to overthrow the Republic.
He could inherit the power of Force lightning. Darth Sidious was known for his powerful Force lightning attacks. In the Naruto universe, this could translate to some sort of unique chakra - based lightning attack that is far more powerful than the normal lightning - style jutsu. Also, Naruto might inherit some telekinetic abilities, being able to move objects with his mind or chakra, similar to how Sidious could use the Force for telekinesis.
Well, if Naruto were the grandson of Darth Sidious in this fanfiction, it would likely bring a dark and different dynamic to the Naruto universe. Naruto's typically positive and bright nature might be conflicted with the Sith influence from Darth Sidious. His values of friendship and hard work could be challenged as the Sith ways are more about power and domination. It could also change the power balance in the Hidden Leaf Village as Naruto might have access to different, perhaps more sinister powers, which would make his fellow ninjas view him differently.
Well, a great fanfiction idea could be that Darth Sidious discovers the existence of the wizarding world through some dark magic connection. He decides to conquer it, thinking it would be easy prey. But he underestimates the power of the Hogwarts students and their loyalty to each other. Harry Potter would be at the forefront of the resistance, using his skills and the support of his friends like Hermione and Ron.
One idea could be a crossover where Darth Sidious discovers the world of Naruto and tries to manipulate the ninja politics for his own gain. He might see the chakra system as a new source of power to exploit.
Palpatine was a Sith Lord from the Star Wars universe. He started as a senator on Naboo. He was secretly a powerful Force - user, following the ways of the Sith. He manipulated political events, creating chaos and war. Eventually, he rose to become the Emperor, ruling the Galactic Empire with an iron fist.