Kuroyukihime

Kuroyukihime is one of the main characters in the Accel World anime and light novels.

Kuroyukihime is the Black King, Black Lotus, 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.

Appearance
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.

She is also considered to be "the most beautiful in school".

Personality
Kuroyukihime has virtuous tranquility and patience, which is perhaps granted from her love to drink tea, even in unfitting locations such as the classroom. Like any human, however, she 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". 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.

Network Avatar
Kuroyukihime is known to have an exquisite, original virtual character design. Her virtual character resembles that of a butterfly and has been dressed in ballet shoes. The overall look is black and while other parts have red or purple. Her avatar also carries an umbrella. This virtual character is the one she commonly uses whenever she has contact with other people and discusses with them about things that are usually happening around school, or she also uses it to demonstrate the world of acceleration, on how they can use it, or on how they can't use it. This avatar is known as black swallowtail butterfly.

Black Lotus
Her "Burst Brain" character "Black Lotus" (Burakku Rōtasu) was once known as the Black King (Kuroō) but after she killed the Red King, she went into hiding.

Black Lotus was known as a fearsome model before and after what happened to the Red King. However, she rarely reveals her Black Lotus form. The form of Black Lotus is more technical and robotic than her virtual character. It seems that she can only soar in a short length in the air instead of flying. The character model's color is black and purple. Black Lotus is unique since her limbs are blades instead.

Abilities
As Black Lotus, her limbs acts as sharp blades capable of cutting through almost any parts of the body upon contact, making her a deadly opponent in close-range combats as her dance is described as "black death waterlily", as well as being immune to grappling and restraining skills such as Static Pressure. Outside of her knowledge of the Brain Burst program and her virtual network knowledge, she has been shown to be a great strategist.

Trivia

 * It is still unknown what Kuroyukihime's real name is.
 * In the web version of the story, Chouzetsu Kasoku Burst Linker (chōzetsu kasoku bāsutorinka, lit. Super-ultimate acceleration burst-linker), her real name is Yukiko Kuroba (Kuroba Yukiko). However, this might not be the same in the published version.
 * It seems that "Kuroyukihime" is her virtual character's name.
 * She told her name to Arita Haruyuki, but he still calls her "Kuroyukihime".
 * Kurasaki Fūko calls her "Sacchan" and Arita Haruyuki tries to address her with "Sa-" but then cuts off and calls her Senpai. Several other members of Elements also call her in a different form that all begin with "Sa-".
 * Kuroyukihime's Burst Link Avatar name is "Black Lotus", yet her avatar resembles that of a butterfly.
 * Her birthday is September 30, 2032 on her forged identity.
 * September 30 is also the birthday of Asuna Yuuki, the female protagonist of Reki Kawahara's other light novel series Sword Art Online.
 * Black Lotus and Black Vise are the only Duel Avatars with the same color.
 * It is later revealed that "Black Vice" is merely a disguise used by Ivory Tower.
 * The only other pair of Duel Avatars with the same color are Blood Leopard and Blood Love. However, this is only in the anime.
 * Kuroyukihime is noted to resemble Kirito, the male protagonist of Reki Kawahara's other light novel series Sword Art Online, as both use a high-speed, duel-sword fighting style and prefer black clothing.