Aina from .hack//G.U.
Ovan's younger sister that appears in volume 3 of the game, .hack//G.U. as a little girl with blue/green hair, dressed in elegant, white gothic lolita-style clothing. Aina played The World with her brother, and they spent most of their time in secret areas, such as The Creator's Room, reading the books contained within, her favorite being the Epitaph of the Twilight.
Link to full ref. picture: http://i46.photobucket.com/albums/f129/rennapidgeot/aina_1.jpg