Height: 152 cm; Weight: 42 kg.
She is secretly a time traveler from the future who came back in time to observe Haruhi Suzumiya. Best friends with Tsuruya and shows a great talent for brewing tea. She underwent mental preparation so that if she reveals anything unnecessary, information regarding time travel will be blocked off from her mind. Thus, whenever she is asked to give information about the future and/or time travel, she is often forced to reply that it is "classified."