At first, X-6 became friends with X-1, X-2, X-3, X-4, X-5 and X-7, the other participants in the training program. Nevertheless, after Soresh started torturing them with electrocution, X-6, like his fellows, had his personality and mind changed completely until he felt no emotions. Around 10 BBY, the assassins-in-training were all pitted against each other until only one remained. X-7 easily killed X-6 and earned the right to become Soresh's personal assassin.
X-6 appeared in a flashback sequence in Rebel Force: Target, the first book of the young readers series Star Wars: Rebel Force, published in 2008 and written by Alex Wheeler.
X-6 appeared in a flashback sequence in Rebel Force: Target, the first book of the young readers series Star Wars: Rebel Force, published in 2008 and written by Alex Wheeler.