Asajj Ventress

Asajj Ventress was a female Dathomirian Dark Jedi and a valuable Dark Acolyte to Count Dooku. Originally a Nightsister from Dathomir, Ventress was taken as a slave to Rattatak and trained as a Jedi Padawan by Jedi Knight Ky Narec. However, after Narec was slain, Ventress gave into her anger and began walking the path of the dark side; taking up the lightsaber of her dead master, she trained herself in the Jar'Kai style of lightsaber combat, before slaying all the warlords on Rattatak and installing herself as its ruler.
Eventually, Ventress's actions came to the attention of Count Dooku, and after a test of her abilities, she became a commander in the Confederacy of Independent Systems. She had yearned to learn the ways of the Sith from Dooku and believed if she had proved herself worthy, she would become his apprentice.
During the Clone Wars, she became one of the most feared beings in the galaxy, notorious for her defeat of several Jedi. As the war continued, Ventress became the bitter enemy of both Jedi Knight Anakin Skywalker and his former mentor, Jedi Master Obi-Wan Kenobi: the latter of which was convinced that she could be redeemed; and the former whom she ultimately helped form into the Sith Lord, Darth Vader. During Kenobi's mission to return Ventress to the light on Boz Pity, she received a life-threatening wound from Skywalker, faked her death and disappeared into the unknown regions; wishing to be free of the Jedi, the war, and Dooku. 
She would continue to watch from afar however as Palpatine manipulated the galaxy into his own design. Eventually she would be discovered within Wild Space by Izard Kalleem, a young male human that had a deep desire to learn of the Sith. The woman beat the young man almost to death before seeing an opportunity for herself in the new galaxy, not as a soldier of hate but as a shaper of destinies. Corrupting the young man, she took Kalleem as an apprentice, and taught him the dark side of the force.
Category:NPCs