YoRHa No.9 Type S, or just 9S, is one of the protagonists of NieR:Automata. He is the main character of Branches B and D, as well as one of the main antagonists and final boss of Branch C. 9S is a Scanner type Android who served during the 14th Machine War. He has an attack function but is an android that specializes in investigative purposes—a member of the automated infantry squad, YoRHa, who triumphs in hacking-based information collection. 9S has the appearance of a teenage boy and the voice that comes with it. He has short, snow-white hair styled neatly, and removing his standard issue blindfold reveals he has light blue eyes framed by rather long eyelashes. His outfit consists of a trench coat embroidered with the emblem of YoRHa on the hem which is split into the sides to allow more movement, that has large cuffs fastened with belts, a pair of shorts, knee-high socks, and a pair of combat boots fastened similarly with belts, all colored black in the same leathery texture all YoRHa units seem to feature on their clothing. For his accessories, he sports a black choker on his neck, from which a square containing an X is attached, black gloves, and his signature fanny pack. Being a Scanner model, 9S is naturally curious about the world around him—especially in regard to the machine lifeforms. Usually working alone, he, along with other S-type models, is deployed on the frontlines and acts as YoRHa's main intelligence gatherer. According to A2, 9S is a "high-end model", implying he is among the newest Scanner types. Being the newest model, he is more likely to dig deeper into YoRHa's secrets than his peers and often asks questions that those around him say he shouldn't ask. As a member of YoRHa, he has a deep distrust of the machine lifeforms that now inhabit the planet which is shown fully when an emissary from Pascal's village confronts him and 2B in the abandoned amusement park. Although not trusting the supposed peace treaty, his overwhelming curiosity causes him to agree to follow the machine to its home. As time progresses, 9S's opinions on machines change as he learns more about them, eventually genuinely caring about Pascal and his villagers. In Routes A and B, if he competes in the colosseum in the Flooded City, he expresses disgust at the Resistance androids in their treatment towards the machines, which rivaled the cruelty he thought only humans were capable of. However, he cannot help but wonder if there is a part of him capable of such depravity. In Routes C and D, his opinions on the machines change drastically. Following the collapse of the Bunker and witnessing the death of 2B as a direct result, 9S goes on a warpath to kill every last machine. Blinded by grief and hatred, he tells himself that there is no meaning to anything the machines do as he goes through the Resource Recovery Units despite knowing the contrary. This cognitive dissonance is only exemplified when he discovers that the YoRHa black boxes are made from machine lifeform cores- something he outright denies. His hatred for the machines is such that he destroys a helpless child core without hesitation, despite the meek protest of Pod 153. Despite all this though, he still seems to regard Pascal in an at least somewhat good light- albeit mostly nonverbally, 9S seems to be mourning for the loss of the village and appears to be concerned for Pascal after the machine has his memories formatted. When conducting himself around other androids- whether they be resistance or YoRHa- 9S is generally cheerful, optimistic, insightful, and eager to help. 9S is also somewhat playful, as seen by how he fist-bumps Pod 153 to show affection. By his own admission, 9S model types aren't well known for their modesty which is displayed with the "Not That I Mind..." achievement/trophy. Also, by his own admission, he's not very good at adhering to YoRHa's protocol of forbidding emotions. He speaks rather informally to those he knows well, such as being rather dismissive of 21O with a tendency to wave her off with "yeah, yeah" or "fiiiiiiine". That isn't to say he's informal to everyone; he calls 2B "ma'am" until she asks him to stop and displays respect towards those who command it, such as Commander White and the Council of Humanity (although he does believe the Council's broadcasts to be "stiff"). When held captive by Adam after the fall of Grün, it is implied for the first time that 9S has a darker side than he lets on. Adam goads him on, saying that 9S wants to hate, rip and tear into those around him. As a final taunt, Adam asks "You're thinking about how much you want to **** 2B, aren't you?" with the censor being intentionally ambiguous with the words "kill" and "fuck" being the most likely fill-ins. This darker side of 9S is also seen in NieR:Theatrical Orchestra 12020 where he has a hallucination of himself killing 2B, something which is referred to as a "twisted desire". Knowing 2B's true designation as an E-type heightens these complicated feelings towards her, but he refuses to act upon them due to having a close connection to her. After 2B's death at the hands of the logic virus and A2, 9S's darker side overshadows his former personality. His change in demeanor is notable as soon as he wakes up in Routes C and D, him being quieter and more subdued as he quietly asks "Where's 2B?". Overcome by grief and rage, 9S's mission objective changes from simply fighting the enemy to enacting revenge against them and A2. His mental state suffers greatly during this time, with Pod 153 growing increasingly more concerned for him as continues his quest to enter the Tower. Gradually, his quiet rage grows louder and louder until it bursts forward at various points; from telling machines to shut up to erupting into a fit of laughter after stabbing the core of a Resource Recovery Unit that he thought was 2B, his behavior becomes increasingly self-destructive and dangerous. Concerned for him, Devola and Popola plead for him to not die alone- a request that falls on deaf ears. Through his deteriorating mental state, pieces of the 9S' former personality still shine through now and again. He is willing to help with menial tasks around the Resistance Camp, feeling particularly bad for how Devola and Popola get treated by their peers and thusly offering to do their chores for him. By helping around the camp, 9S will eventually learn of an old human tradition regarding mourning. Moved by this tradition, and still grieving for 2B, he erects a grave for her stating that he'll be with her soon, implying that he knows he won't be living much longer. 9S is also seen to be caring for 2B despite knowing her true designation at the end of Route D where he uses his last breath to look at the sky and declare "So that's where you've been... 2B."