Darth Sidious sure seems to be a conservative!
In the original trilogy, he appears as the Emperor of the Galactic Empire where he is an aged, pale-faced figure who is clad in dark robes. He oversees the Galactic Civil War‘s final stages between the Rebel Alliance and the Empire, in which he is ultimately defeated and killed.
In the prequel trilogy, he is a middle-aged politician of the Galactic Republic who rises to power through deception and treachery. As the Senator from Naboo and then the Chancellor of the Republic, he outwardly behaves like a well-intentioned public servant and supporter of democracy. But underneath his affable public persona is his true identity of Darth Sidious, the Dark Lord of the Sith. As both personas, he sets into motion a series of events—including the Clone Wars—which ultimately destroy the Jedi and the Republic, allowing him to convert the Republic into a brutal totalitarian regime.
Since the initial theatrical run of Star Wars, he has become a symbol of evil and sinister deception in popular culture.