Darth Sidious, a Force-sensitive human male, was the Dark Lord of the Sith who founded the Galactic Empire after toppling its predecessor, the Galactic Republic from within. Prior to his term as Supreme Chancellor and subsequent reign as the Galactic Emperor, Sidious was born approximately eighty-four years before the Battle of Yavin and given the name Sheev Palpatine during the Age of the Republic. 

Prior to the creation of his Empire, Palpatine was careful to put on a charade, presenting himself as a grandfatherly gentleman and a servant of the public good. When in character, he often spoke of himself with great modesty, and maintained only as much luxury as was expected of someone of his stature. However, Palpatine was in fact a skilled manipulator and strategist, having orchestrated countless events in the galaxy, from the Invasion of Naboo to the Clone Wars, with the sole aim of increasing his own power. Even when something occurred that he did not initially plan for, the Sith Lord demonstrated that he was as adept at improvisation as he was at plotting. 

Darth Sidious should sound like either one of his voice actors; Ian McDiarmid, Ian Ambercrombie, Tim Curry, or Sam Witwer.