X9

"Seems like Aku got himself a little problem... a problem that won't go away... a samurai problem. I wanted nothing to do with it but that funny scientist informed Aku of my emotions. They got Lulu... sweet thing. I have no choice. Damn feelings. I came out of retirement."

- X9 X9 was a skilled and intelligent assassin built by scientists under the employ of Aku. He was forced out of retirement by Aku to destroy Samurai Jack.

Story
X9 was one of the early models of Aku's combat drones, the X-series, designed and constructed by the very same scientists who would later create the Beetle Drones. However, unlike his fellow bots, X9 was bestowed an artificial emotion chip by one of the eccentric scientists who "was funny like that." This additional software gave X9 an edge among the other drones, able to think on his own and realize that he was not willing to die but rather live. As a result, he managed to survive all of his missions while the rest of his unit were all destroyed, and quickly became one of Aku's most powerful soldiers. He had also developed strong emotions often regarded as human-only, such as loathing, guilt, and unconditional love. Prime examples of this would be his feelings towards a stray dog that he named Lulu, his contemplative admiration of Jazz music, anger towards the deaths of fellow X-series models that did not care whether they lived or died, and a visible regret for carrying out executions. X9 was also noted to have hated rain as it made him feel sentimental.

Season 3 Episode XIX: The First Fight
X9 seems to have a annoyance towards A-Z, as when he says his arms look rusty and A-Z starts rushing through he recgonizes the glow and starts charging towards it.