Kuroyukihime

Kuroyukihime is the leader of the Black Legion, Nega Nebulus. She was formerly known as the Black King, but she was driven into hiding after killing the former "Red King." Her biggest ambition is to reach level 10 and meet the creator of Brain Burst, and to accomplish that goal, she has to defeat five other level 9 users who happen to be The Six Kings of Pure Colors, the leaders of the six most powerful factions in Brain Burst. Kuroyukihime is also  Silver Crow's Burst Linker parent. Her real name is unknown.

Kuroyukihime is a mysterious and popular student who also happens to be the Student Council Vice-President at Umesato Junior High School. Her Brain Burst Avatar is Black Lotus, in which she was a burst linker only when she was eight years old. She values Haru as more than a subordinate and is often the voice of reason to him when he is willing to go to extremes to protect her. Prior to her hospitalization, she confesses to Haru that she fell in love with him