Zero's next mission is the assassination of a Mutual-Nil Prisoner named Fa Yuan. Zero escapes the club, before being called by his handler, if Zero talked to Electrohead, he can confront the Psychiatrist with the DJ's confession, though the Psychiatrist won't be happy that Zero defied his orders and spoke to Electrohead. The player can either kill the DJ before the dialogue, or talk to him until V shoots, which still counts towards the assassination. He goes to say the bottle that the drug came in was unlabelled, leaving Zero at a disadvantage for not knowing the name of the drug. He goes on to explain that a drug he used after buying at an auction has greatly altered his perception of time and reality. Electrohead initially struggles at first to confirm if Zero is 'real' when he first arrives, despite the blade at his neck. As Zero makes his way to the back of the club where Electrohead is, the two enter a brief dialogue. When Zero arrives at the club, he's required to sneak past the lightly armed guards by blending in with the club goers, after making his way through the front and to the back of the club, he's called by his handler, warning him to not talk to Electrohead, as Electrohead is noted in the mission dossier to be a pathological liar. His next mission is the assassination of a Underground DJ named Electrohead, who is performing at Club Neon. Regardless, Zero leaves the Hotel and retires for the night. Zero can optionally defend the bloodstains noticed on his outfit as either bath products or part of his 'cosplay', after a few moments, the officer will let Zero pass, but if Zero interrupts the conversation, a fight ensues as the officer is quickly dispatched and the Receptionist will flee. If Zero was patient with the Receptionist beforehand, she will chime in to Zero's defence, claiming that Zero is one of the 'guest's' of the Hotel. As he attempts to leave, Zero is stopped by a Police officer, claiming that there were reports of gunshots in the building, and demands that Zero explain who he is. Despite this, Josh Rose will die either after the end of the conversation by jumping of the balcony, before if Zero tries to kill him in the beginning, or if Zero throws something at him beforehand. The player can extend the conversation slightly, as Josh explains that he understood why Zero had come to kill him, claiming that 'they made a lot of mistakes during the war'. Once Zero has eliminated all enemies through the Hotel, he will find Josh Rose quietly smoking on the balcony, Rose initially surprised at Zero's appearance, not believing there was 'more than one of you'. When he arrives, he initiates brief conversation with the Hotel's Receptionist, and depending on player choice, will either calmly allow him to proceed or will become infuriated and demand he go somewhere else (which still allows him to enter). His next mission assigned to him is a high value target by the name of Josh Rose, located at the Murdower Hotel. Zero has a nightmare of a boy playing catch in a shed before a shadowy figure bursts in and envelops the room, jolting awake in response. Zero manages to escape the Factory before retiring for the night. His mission runs into complications as the captured scientist has his head blown off by V, who simply laughs in response. Zero first appears in the Factory Hideout mission, as he's tasked to rescue a captured scientist, but not before being reminded by his handler to leave no survivors. However, he retained his abilities from the NULL program and continued to use them during his time as an assassin. Due to his use of Chronos (and a near-fatal head injury during the war), Zero soon lost his memory of much of his early life. As part of the program, he was administered the experimental drug Chronos, which gave him incredible precognitive abilities allowing him to predict entire combat scenarios before they even happen, predict the correct answers out of an interrogation, and rewind time upon deathĪfter the war, Zero began working as a killer for an unknown employer that is implied to be the government. While his past before the NULL project is largely unknown, it's stated that he had a normal upbringing until his involvement with the program.

He was selected as a child to be a member of the Gamma NULL category, the most dangerous type of soldier produced by the program, because of his aggression and mental problems.

Zero is a NULL who served in the Cromag War as an ally to New Mecca alongside another NULL, Fifteen.

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