Yuki Nagato - SOS Brigade Role

SOS Brigade Role

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 camo 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 Ryoko Asakura.

In the SOS Brigade's amateur movie production The Adventures of Mikuru Asahina, Yuki was cast as the leading antagonist. She was portrayed as an evil alien, who could also use magic.

Kyon also realized after the "camel 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 Data Overmind that a drastic event that could end the universe would occur. It is also believed that Haruhi is also the key to autoevolution and to stopping the evolutionary stand still they have come to, 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. She later bites her to inject nanomachines that disrupt any powers Haruhi gives her.

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 "Agency", Mikuru's time traveling organization, and the Data Overmind 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. However, she had left Kyon's memories intact, as well as provided an escape program, should he desire to return to the old world. Despite the fact that Yuki was most likely going to be deleted for her actions, Kyon has had her remind the Data Overmind 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 Data Overmind didn't, knowing that the Overmind cannot lay a finger on Yuki. If this happened, it would ruin reality thus making their mission a failure. The Yuki from the alternate world stars in the spin-off manga, The Vanishing of Nagato Yuki-chan.