Yuki Nagato is a fictional character in the Haruhi Suzumiya light novel series. She is initially portrayed as an introverted, taciturn bibliophile. She is actually an artificial human created by the Integrated Data Entity, and possesses supernatural powers as a result. She joins Haruhi Suzumiya's SOS Brigade in order to observe her on the behalf of the Integrated Data Entity. In addition, she is present to ensure that Haruhi does not use her godlike powers, and aids the other Brigade members in stopping forces that wish her to do so.
Apparently, Yuki has extremely pale skin, as there are numerous times in the original light novels where Kyon describes her face, neck, hands, or fingers (as she flips the pages of the book she is reading) as "white". Also, Kyon always comments on Yuki's uncanny ability to walk "soundlessly" (this can be seen in the anime when Yuki is exploring a public library with Kyon who appears puzzled by it). Yuki is attractive enough to earn an "A-" grade from Taniguchi and, as Taniguchi states, has a lot of secret admirers. In The Vanishment of Haruhi Suzumiya, when Kyon came face to face with Yuki in a twilight realm (here she is simply a normal, shy girl) blushing in front of him, he was stunned by her and even felt for a moment that it would be good to stay in this realm and join the Literature Club for good.
Yuki Nagato is a quiet high school freshman that is the only member of the SOS Brigade that willingly joined Haruhi's SOS Brigade and was not "voluntarily arrested," or forced into joining, by Haruhi Suzumiya. She was a member of the Literary Club, whose other members were all seniors who graduated, leaving Yuki the sole member of the club. She lives alone in the same apartment complex as Ryōko Asakura, in room 708. She wears her school uniform almost all the time (even on non-school days). She initially wears glasses but, after the confrontation with Ryōko Asakura, they get broken. She planned to create new ones, but decided against it after Kyon told her that she was cuter without them. She wears a different outfit for the first time when the SOS Brigade goes on vacation to the remote island in "Remote Island Syndrome".
Yuki is a "humanoid interface", or artificial human, created by the Integrated Data Entity for the purposes of interacting with and observing events on Earth. Specifically, she has been created to observe Haruhi, who can create huge quantities of data from nothing. Haruhi represents the potential for an evolution in autonomy; an ability that the Integrated Data Entity does not have.
As an artificial human, she has numerous paranormal abilities. She is capable of manipulating the properties of the environment and any materials within it at any scale to her desire, referred to as "bogus magic" by Kyon. For instance, she can modify the "elemental boost information" of a baseball bat to hit only home runs, nullify data links (removing other artificial interface connections from their bodies), plus she is able to make a cover up story (since Ryōko was gone, she made a cover up story that she moved to Canada), and reconstruct a classroom, down to the last detail, after everything in it was completely destroyed. As a result, she is capable of feats of superhuman strength, agility, and stamina. In one instance, she was unfazed while impaled by multiple metal spikes, and effortlessly reconstructed her body afterwards. Her state also affords her an extreme level of intelligence. She can comprehend the rules and concepts of a game instantaneously, as well as create flawless strategies based on her observations, and was able to learn how to play a guitar mere moments after receiving one. However, she has been seen to be fallible, such as when she reconstructed the devastated classroom but forgot to reconstruct her broken glasses. Yuki also has a lack of understanding towards social norms and earth technology, as demonstrated by her bluntly literal future predictions and her clumsy attempts at using a computer mouse, electing instead to interface completely via keyboard. This is likely due to her self-imposed state of near-total isolation in order to interfere with as little of the environment around Haruhi as possible.
Yuki has a very stoic and introverted personality, preferring simple body language rather than speaking. When prompted to speak, she does so in a very concise manner, always speaking in a monotone and displaying a dispassionate expression. She thinks very rationally, and finds it difficult to communicate with normal humans due to her intelligence and lack of empathy. She enjoys reading, and is seen reading a book in the majority of her appearances, typically of the science fiction or mystery genres. As the series continues, she displays an enjoyment of computer games and develops a sense of humor, although her unchanging facial expressions make it near-impossible to discern whether she is joking or not. Despite her reserved manner, she is reliable and trustworthy, resulting in Kyon trusting her more than any other member of the SOS Brigade. Though seemingly cold and devoid of emotions at first glance, Yuki subtly shows a genuinely warm care and concern for her fellow SOS Brigade members, Kyon in particular. This is shown by her keeping Kyon warm with her cardigan as he fell asleep in the club room, and her taking care of Mikuru when she fainted from terror in the "Murder Island" incident. At the end of The Vanishment of Haruhi Suzumiya, she also expresses gratitude towards Kyon's promise to protect her from being deleted with a simple "thank you" (even though up this point, expressing gratitude or emotion is supposedly uncharacteristic of her). In The Disturbance of Haruhi Suzumiya, where a guy named Nakagawa supposedly fell in love with her, she revealed to have felt a slight sense of disappointment when in the end, it turned out to be a misunderstanding involving the Integrated Data Entity. Also, when Kyon and Haruhi are trapped in closed space in The Melancholy of Haruhi Suzumiya and in the anime adaptation, Yuki (able to communicate with Kyon via the computer in the club room) tells him "It's our desire that you return. Haruhi Suzumiya is a valued subject." but also that "I [Yuki], as an individual, also feel a desire for you [Kyon] to return." All these show how Yuki is slowly becoming closer and closer to having "emotions" and becoming more "human".
SOS Brigade roleEdit
Yuki is described by Haruhi as the SOS Brigade's "indispensable silent character." She was neither recruited by nor did she join the Brigade but was actually included along with the room when Haruhi arrived and declared it as her own. Whenever she is in the club room, she is usually reading. Similar to Itsuki Koizumi, Yuki is obedient when orders are given; however, her loyalties lie more with Kyon rather than Haruhi. The other members often rely on Yuki and her abilities whenever needed most, notably when the SOS Brigade was losing in the baseball tournament, the contest against the Computer Society, and in the case of the Cave Cricket. Aside from this role, she is also protective of Kyon, as evident when she used her body to shield him from an attack by Ryōko Asakura.
Kyon also realized after the "cave cricket" incident that Yuki plays a "behind the scenes" role, making her one of the puppeteers whose goals are to ensure Haruhi is fully satisfied and that order and balance are maintained. Her intentions of being in the Brigade are to monitor Haruhi and prevent her from feeling bored or greatly disappointed because it is generally believed by the Integrated Data Entity that a drastic event that could end the universe would occur. It is also believed that Haruhi is also the key to evolution and thus it is important for Yuki and other humanoid interfaces to continue their observations. As part of her observation duties she has the ability to detect any spatial changes in the environment caused by Haruhi and will act to prevent them from persisting. An example of this is during the unscripted attack in the first fight scene of the Brigade movie, when she tackled Mikuru in order to remove her contact lens which had temporarily caused the fictional "Mikuru Beam" to become real.
Able to alter reality to some extent (though not even approaching the ability of Haruhi), Yuki was revealed to have been responsible for the world Kyon found himself in, where Ryoko, Yuki, Mikuru, Itsuki, and Haruhi were all normal beings (meaning Itsuki's "Organization", Mikuru's time traveling organization, and the Data Integration Thought Entity were non-existent) and the latter two never went to North High, thus no SOS Brigade, due to internal errors revealed to be something she was not supposed to have: emotions. Despite the fact that she was most likely going to be deleted for such, Kyon has had her remind the Integrated Data Entity that if that were to happen, then Kyon could always make Haruhi realize her powers (by telling her about John Smith) and make her alter reality so that Yuki would exist while the Integrated Data Entity didn't, knowing that the Entity cannot lay a finger on Kyon lest they ruin reality thus making their mission a failure.
In the Japanese anime as well as in the radio dramas, the role of Yuki is played by Minori Chihara. Her English counterpart is portrayed by Michelle Ruff. Minori Chihara would reprise her role as Yuki in an episode of Lucky Star, as did Ruff. Moreover, Minori Chihara would go on to voice Minami Iwasaki, who has a similar personality to Yuki, in Lucky Star; Ruff also followed in the same path, portraying the English voice for Minami and Tsukasa.
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