Palpatine was elected Supreme Chancellor Of The Galactic Republic during the Battle Of Naboo. He appears as a friendly and charismatic individual, but not many know his dark secret. He is the Sith Darth Sidious, controlling the Clone Wars. He is a mentor to Anakin Skywalker, and plots to turn him down the path of the Sith.
Anakin is apprenticed to Obi-Wan Kenobi. He is a strong and loyal Jedi, but he constantly desires power. He is tormented between his love for his wife, Padme Amidala, and his loyalty to the Jedi Order.
Ki-Adi-Mundi is a member of the Jedi Council and loyal to the Old Republic. He reluctantly agreed to be a general during the Clone Wars. During the last year of the war he served with Commander Bacara and his Galactic Marine Snowtroopers on snowy planets such as Rhen Var, Mygeeto and Hoth.
General Kit Fisto:
Kit Fisto was an active general during the Clone Wars. He fought on a multitude of planets, from the waterworld of Mon Calamari, and even to the icy world of Rhen Var.
Obi-Wan is constantly wary of his reckless padawan, Anakin. They fought together all throughout the Clone Wars, and when Anakin was knighted and Obi-Wan placed on the Jedi Council, became brothers. Obi-Wan is forced to fight and defeat Anakin, now Lord Darth Vader, on the lava world of Mustafar.
Wary of Palpatines increasing powers, Bail Organa is a influential senator. He and Mon Mothma have formed a secret underground organization, which will become the Rebel Alliance. When the Republic became an Empire, 501st Stormtroopers stormed the Jedi Temple. Organa arrived just in time to see the Stormtroopers killing a Jedi padawan, then Bail escaped the scene.
Mace Windu is one of the most powerful Jedi, second to Yoda. He too, along with Obi-Wan is wary of reckless Anakin. Mace Windu is killed by Emperor Palpatine shortly after the Clone Wars end. He was received a painfully large amount of force lightning, then fell out of the Grand Window of Palpatines office. His body was never recovered, but years later an Imperial Technician wandering the Coruscant streets reported seeing a "Small gold and silver stick" lying on the ground.
A New Order:
As the Republic became the Galactic Empire, many new leaders arose.
Lord Darth Vader:
When Anakin helped kill Jedi Master Mace Windu, Palpatine offered him to learn the ways of the Dark Side, and save his love Padme. Anakin agreed, and thus Darth Vader was created. His first task as a Sith Apprentice was to lead a legion of 501st Stormtroopers to the Jedi Temple and wipe out the Jedi "Traitors". After this he slaughtered the leaders of the Seperatist Remnant on the lava world of Mustafar, where he was defeated by his former Master, Obi-Wan Kenobi. Palpatine and his Imperial Shocktroopers salvaged his body on a lavabank and took his body to an Imperial Medical Facility on Coruscant, where some of the Empires best medical droids worked on him. They encased his burnt and crisped body in Sith Armor, taking away some of his humanity but his hate, anger, and fear were still intact.
A very high-ranking and model Imperial Official, Tarkin was one of the main leaders of the Galactic Empire. He worked closely with Palpatine and Vader, and showed no fear in the presence of either of them. He was killed when the Death Star Space Station was blown up by Luke Skywalker. He wore uniforms similar to the Imperial Commanders and Officers, despite his high rank.
Grand Admiral Thrawn:
Despite being an alien, Thrawn ascended rapidly in the ranks of the Empire. He was one of the best tactical experts of his time, second to Palpatine. His species, the Chiss, were very similar to humans, except they had blue skin and distinctive glowing red eyes. Thrawn was killed by his Nogrhi bodyguard Rukh.
A competent Imperial Intelligence Official, Ysanne Isard was one of Palpatines closests advisers. After her father, the leader of Imperial Intelligence, execution, she became the leader of Imperial Intelligence. She constructed, under Palpatines supervision, a complex prison facility, which was actually a functioning Super Star Destroyer. Prisoners thought they were trapped in a barren rock-world, despite being feet away from the Coruscant skyline. She wore a standard-issue crimson Imperial Intelligence uniform, and had a cold, cruel, and unforgiving personality, earing her the nickname, "Iceheart".