The heroes and villains of my work in progress.
Kyrsta Starwind witnessed the destruction of her homeworld Alderaan, and unlike Leia Organa she pursued a violent and self-destructive vendetta, killing any imperials she could get her hands on. She and started a pirate crew who attacked imperial military targets, but her relentless attacks often destroyed innocent lives as well. After the rebel victory at Endor she continued her personal war until she was discovered by the New Jedi Order who recognized her enormous potential for the force, and also the dangerous path she trod.
She was tempted to the dark side by Kuar Covan, a force vampire (draining the living force from his victims), and his army of dark jedi. Recognizing Kyrsta's desire for revenge and unchecked anger he drew her into his faction, hiding the truth from her that he and his disciples were still fanatically devoted to Palpatine and dedicated to wiping out the New Republic and finding a way to once again resurrect Palpatine...
After nearly falling to the dark side she at last came to grips with her past thanks to the help of her friends in the Jedi Order and became a strict practitioner of the light side, specializing in the rare and dangerous technique of sever force. Vowing never to kill again, she instead defeated Covan by severing his connection to the force permanently.
Oh, and Narthax figures into her story there somewhere.