She is an alien humanoid interface who observes Haruhi Suzumiya in the context of a supernatural anomaly. Emotionless, and often speaks with stoic brevity. However, when necessary, Yuki speaks with exposition. Knows of aliens, time-travelers and espers. She is a product of the Data Integrated Thought Entity; DITE or ISDE in Japanese. Lives alone, and likes tea. Discretely, she is incapable of feeling love; however, in different universes, other versions of her are capable.