game-ko
Character from "Gamegame (BMS edit)", s-don's Bms_Of_Fighters_2012 title. Designed by Shino Chiyo. (pixiv #30512945)
She has star-shaped pupils and blonde twintails.
See also
* Niconico: http://www.nicovideo.jp/watch/sm18974010
* BMS file: http://manbow.nothing.sh/event/event.cgi?action=More_def&num=336&event=83