Originally a Jedi, Count Dooku was the leader, along with General Grievous, of the CIS. He was a powerful and charismatic individual, and also a Sith Lord. He was armed with a curved red lightsaber. He was killed by a Jedi Knight named Anakin Skywalker during the Battle of Coruscant.
After almost dying in a shuttle "accident", General Grievous's vital organs were enclosed in a suit of almost indestructible armor. He had a collection of lightsabers, and would use sometimes four in combat. During the Clone Wars he killed over 60 Jedi by himself. He was destroyed by Jedi Master Obi-Wan Kenobi in the Utapau system.
Nute Gunray was the leader of the Trade Federation during the Battle of Naboo and the later Clone Wars. He was a cowardly Neimoidian, and prefered battle droids to do his bidding. He was one of the last leaders of the CIS Remnant to be killed by Lord Vader on Mustafar.
Chairman of the IG Banking Clan, San Hill was one of the countless rabble of CIS leaders that obeyed Darth Sidious's every will. He was also one of the first to join the Confederacy.
A female Gossam, Shu Mai was president of the Commerce Guild, which suplied the CIS with Spider Droids. When Lord Vader arrived at Mustafar, she jumped on a table. Then Vader executed her with his lightsaber.
Foreman of the Techno Union and Executive of Baktoid Armor Workshops, Tambor was an influentle Skakoan from Skako. Lord Vader blew up his head.
Poggle The Lesser:
Poggle The Lesser was the Archduke of Geonosis during the Clone Wars. He willingly donated his Geonosian Warriors and Battle Droids to the CIS cause. Poggle, like the other leaders of the CIS Remnant, traveled to Mustafar, and stayed there for around a week until Darth Vader arrived and executed Poggle with his lightsaber.
A flamboyant magistrate of the Corporate Alliance and a former senator, Passel Argente was one of the first to pledge his alliegance to the CIS cause. He was present at the Battle of Geonosis, and planned out the attack on the Kamino Cloning Center. He was killed when Darth Vader decapitated him.
An aqualish senator of the planet Ando, Po Nudo was very supportive of Dooku's cause. He had a special relationship with fellow CIS leader Tikkes.
A quarren senator and leader of the Quarren Isolation League, Tikkes had a spot on the Seperatist Council.