Kuroyukihime

Kuroyukihime (黒雪姫, Kuroyukihime) is one of the main characters in the Accel World series. She is the Black King (黒王, Kuroō), 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 of Haruyuki and now works together with him to reach Level 10 and meet the creator the Accelerated World by defeating the other Pure-Colored Kings.

Holding true to being "the most beautiful girl in school," Kuroyukihime is a very attractive and slender young girl with long black hair that has two strands of hair extended from the top of her brow, resembling the antenna of a butterfly and large hazel eyes. When Kuroyukihime was hospitalized, she had her hair in a ponytail. Her wardrobe is usually her school uniform consisting of black tights, a dark green skirt with a brown trim, a navy blue blazer, and a light blue bow tie. As she moves to her final year at school, her uniform alters to a red bow tie with all else being the same. It is extremely rare to see Kuroyukihime in casual clothing. It is somehow known that she prefers to wear black colored clothes.

Kuroyukihime can sometimes be rude, angry, or even jealous when girls flirt with Haruyuki. She also has a habit with hypnotizing wordplay which others find to be an annoyance. She shows wisdom and experience, knowing details about the "Brain Burst" game due to her time as the "Black King". Unsurprisingly, she is also a good strategist. Brain Burst is not her only area of expertise, however, showing proficiency with the infrastructure of networks and deducting information, even knowing the steps undertaken by the networks that have been used.

Kuroyukihime boasts of herself, believing to be a bright individual. During her time as the "Black King", she killed the previous "Red King" and also tried to kill the other members of the "The Six Kings of Pure Color" in order to reach level 10 and find out who the creator of the Brain Burst game is. When she doesn't know someone's name, she will address them as "boy" or "girl", as she did with Haruyuki when the two first met and for a time afterward. She seems to be a hardcore gamer, especially simulation games, as she defeated Haru at his favorite game of squash by achieving more points than him. However, she later admitted to using Brain Burst to beat his score. She also loves Haruyuki, and their friendship grows to the point where she acts as his spouse, because despite her role as Legion commander and Silver Crow's parent, her love for Haruyuki is so deep, to the point that he has changed her life purpose to the promise that she will stay by Haruyuki side forever in spite of the multiple risks that exist around Brain Burst, being him the person that she most appreciates of all. However, even when they show romantic feelings towards each other, they become serious when fighting against others or giving each other information.