On spying this selection of outstanding images gathered up by the hands of the Vippers, I must admit, I was at a loss – 佐々木 / Sasaki? A Haruhi character? And a boku-shoujo? From the novels I presumed – some research reveals her to be a Haruhi rival character, and a superior one at that.
In this gallery you can see more of her, and her alt-SOS-dan (周防九 / Kuyou Suou, with the long black hair, is in particular shaping up as the new Nagato it would seem), so please do convert.