From No Game No Life. Cosplayer unknown.
The youngest and strongest of the Flügel race. Her love toward knowledge started even before the declaration of the Ten Oaths. She is against the book sharing law created by the Council of Eighteen Wings and left Avant Heim, her homeland, to win the National Library of Elchea from the previous king in a game. When Sora heard what happened to the library, he challenged Jibril in order to gain knowledge of the other kingdoms. (no-game-no-life.wikia.com)