Kuroyukihime

is one of the main characters in the Accel World series. She is the, , 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.

She is voiced by Sachika Misawa in the anime adaptation of Accel World.

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.

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.

Kuroyukihime's Duel Avatar, Black Lotus, has a glossy black color. Her helmet is angular, with two wings coming off the sides. Her face-shield is a translucent purple. She has a skirt of sharp blades, invoking the image of a lotus flower. All four of her limbs are swords, which is one of her Abilities. She hovers a small distance above the ground, which is how she moves.

Personality
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.

Background
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.

Abilities
Kuroyukihime's duel avatar, Black Lotus, grants her a variety of abilities while in the accelerated world.


 * Hovering – A perpetually-active passive ability that causes her to move by gliding a small distance above the ground instead of having to physically touch it.
 * Terminate Sword – A perpetually-active passive ability that makes her limbs, which are sharp blades, capable of cutting through nearly anything. While a blade usually has cutting power only when it has momentum, Terminate Sword grants Lotus' limbs the highest-level severing force even when the blades are completely motionless, making her a deadly opponent in close-range combat. It also makes her immune to grappling and restraining skills.
 * Overdrive – An ability that boosts a certain aspect of her duel avatar's stats. Overdrive has three modes – Mode Red, Mode Green, and Mode Blue – which bring her stats closer to those a Duel Avatar of that color and cause the lines in her armor to glow with the corresponding color.
 * Mode Red – This mode improves her range. When activated, it causes her right sword to lengthen by 1.5 times and creates a diamond shape on the tip that resembles the head of a spear.
 * Mode Green – This mode boosts her defence to the point that her swords are able to take a hit from the Legendary Enemy Nidhogg without breaking.[10] When enhanced with incarnation, she forms a round shield of green Over Rays centered on where her swords cross.
 * Mode Blue – This mode improves her close range attacks.
 * Death by Barraging – Black Lotus' Level 4 Special Move. She uses of one of the Terminate Swords on her legs to slice 100 times per second, lasting 3 seconds. They glow violet while activated.
 * Death by Piercing – Black Lotus' Level 5 Special Move. As its name suggests, it is a thrusting attack that pierces the enemy, acting very similar to Vorpal Strike, albeit with a much shorter range of a maximum five meters.
 * Death by Embracing – Black Lotus' Level 8 Special Move. It causes her swords to glow violet and does a lot of damage, but has an extremely short range. It was used to kill Red Rider, enhanced by the Incarnate System.
 * Judgement Blow – An ability given to all Legion Masters that allows them to uninstall Brain Burst from one of their legion members.
 * Incarnation
 * Vorpal Strike – An incarnation attack similar to Death by Piercing, which glows red and extends her range greatly.
 * Starburst Stream – Black Lotus' arm swords glow blue-white, then 8 white glowing spots form on each sword, which she throws out extremely quickly. The spots hit hard enough to cause shockwaves.
 * The Eclipse – An incarnation attack in which she spins around with her swords out. Blue-white Over Rays cover its tips, making her look like an annular eclipse when seen top-down. She can perform 27 slashes in 2.5 seconds.

Trivia

 * Kuroyukihime appears as a playable character in Dengeki Bunko: Fighting Climax.
 * Kuroyukihime appears as a main and support character in Dengeki Bunko: Crossing Void.
 * Bride Kuroyukihime (Main) and Butterfly Kuroyukihime (Main) are also available in the game.
 * Kuroyukihime is voiced by Sachika Misawa in the anime adaptation of Accel World.
 * She shares a voice actor with: Cosmos (ORESUKI).