Nagato Yuki

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 Suzumiya Haruhi'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.