Count Dooku was a menacing Sith Lord and central figure in the Clone Wars. Once a Jedi -- trained by Yoda -- he became disillusioned with the Jedi Order and thirsted for greater power. Dooku voluntarily left the light side behind and became Darth Sidious’ dark side disciple, taking the secret name Darth Tyranus and leading the Separatist army.
Rather than use flesh-and-blood warriors, the Separatists prefer mindlessly loyal soldiers that are unquestioning of orders, and easily controlled. The soulless ranks of their battle droid armies consists of tall, thin robotic soldiers with exposed joints and bone-white or rust brown metal finishes that gives them an eerie resemblance to animated skeletons. Battle droids are very efficient, and can be controlled from centralized command centers, like the enormous Droid Control Ships used by the Trade Federation. They are dim-witted, often suffering programming glitches that give them quirky personalities that are too slow to adapt to enemies like Jedi Knights and clone troopers.
A Senator of the Confederacy of Independent Systems, Mina Bonteri had been a friend to Padmé Amidala, serving as her mentor on Naboo. Padmé missed her friend dearly, but contact between the Separatist and Republic governments was illegal during the Clone Wars. Nonetheless, Padmé secretly voyaged to Raxus, where she developed a peace accord with Mina. Bonteri proposed the peace overture to the Separatist government, finding support. The corporate barons secretly profiting the war did not agree, however. Mina died under mysterious circumstances, and her peace effort died as well.
A harsh rocky world less than a parsec away from Tatooine, Geonosis is a ringed planet beyond the borders of the Galactic Republic. Its uninviting surface is made up of harsh, rocky desert, and the creatures that evolved on Geonosis are well equipped to survive in the brutal environment. The most advanced lifeform are the Geonosians, sentient insectoids that inhabit towering spire-hives. The Geonosians maintain large factories for the production of droids and weapons for the Separatist cause in the Clone Wars.
Scheming, powerful, and evil to the core, Darth Sidious restored the Sith and destroyed the Jedi Order. Living a double life, Sidious was in fact Palpatine, a Naboo Senator and phantom menace. He slowly manipulated the political system of the Galactic Republic until he was named Supreme Chancellor -- and eventually Emperor -- ruling the galaxy through fear and tyranny.
The foreman of the Techno Union, Wat Tambor was one of the original and most fervent Separatist leaders, pledging his loyalty and his battle droid armies to Count Dooku at a pivotal meeting on Geonosis. Later in the war, Tambor was appointed emir of Ryloth. His occupation was a cruel one, in which Tambor stripped the Twi'leks of whatever valuables he could find, then bombed their villages.