Kuroyukihime

Kuroyukihime (黒雪姫, Kuroyukihime, lit. "Black Snow Princess"), real name Kuroba Sayuki (黒羽 早雪, Kuroba Sayuki), is one of the main characters in the Accel World series. She is the Black King (黒の王, Kuro no Ō), Black Lotus (ブラック・ロータス, Burakku Rōtasu), and the leader of the Black Legion, Nega Nebulus. She is the one who gave the Brain Burst program to Haruyuki and now works together with him to reach Level 10 and meet the creator of the Accelerated World by defeating the other Pure-Colored Kings.