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 Ryoko Asakura. She wears glasses and her school uniform at all times, permanently discarding the former only after Kyon babbled that she was cuter without them, and first wearing a different outfit when the SOS Brigade went on vacation to a remote island.Yuki is a “humanoid interface“, or artificial human, created by the Data Integration Thought 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 Thought Entity does not have.