Yuki Nagato

Yuki Nagato (長門 有希, Nagato Yuki) is a bibliophile humanoid interface that was created by the god-like figure called the Data Integration Thought Entity. Yuki's responsibilities involve monitoring Haruhi and the investigation of an unexplained "explosion of data" three years before the present story. She can manipulate her surrounding environment, or "data" as quoted by her. Yuki is usually very terse but can speak at length when it has to do with her mission or a problem that has arisen. While she always seems engrossed in her reading, she comments that she is only relatively interested in them. Yuki gives hints and aid to Kyon. Due to her extraterrestrial nature, she almost never displays involuntary emotional responses or tics, but there are times when she shows interest in things, such as programming computer games and playing them, as well as reading. In The Disappearance of Haruhi Suzumiya novel and film, the unpleasant emotions developed throughout the series, caused by the people around her, make her wish for a normal world, and she betrays the Data Integration Thought Entity and the SOS Brigade to make her wish reality. After the situation is resolved, the Data Integration Thought Entity contemplates withdrawing Yuki from Earth due to the danger her instability poses; this is an ongoing subplot for the remainder of the series. She is also the heroine of the spin-off series The Disappearance of Nagato Yuki-chan. Nagato retains her character from The Disappearance of Haruhi Suzumiya in which she is not an alien —but a shy girl who has a crush on her fellow literature club member, Kyon. She had an accident, a near-hit with a car that possessed her with a different personality, having the quiet and stoic character in The Melancholy of Haruhi Suzumiya. With her inevitable disappearance drawing near, she confesses to Kyon before she disappears with the other Yuki taking her place.