Asuramaru

Asuramaru is a high-ranked demon of the Black Demon Series. He formed a contract with Yūichirō Hyakuya and became his Demon Weapon.

Appearance
Asuramaru appears as an androgynous young adolescent. He has large red eyes and wild wavy dark blue hair that appears to go beyond his feet. Bangs cover his left eye. As a vampire-gone-demon, he has red eyes, fangs, and pointed ears.

He wears a headband formed of two parallel golden strips that match the horns piercing through his hair from the edge of his hairline. The horns grow larger once Yu loosens the curse restraining him.

He wears a sleeveless open-back dress (?) with a collar covering his throat. The chest piece is black while the rest of the dress is white. The gown splits open at his outer thighs, freeing his legs for movement. He wears black sleeves separated from the gown that reach his mid-upper arms and come down his arms to his middle fingers, where each sleeve is attached to a ring. He is barefoot.

As Asuramaru exists as a mental concept, he can appear as anyone within Yu's memories he chooses. He often takes the forms of the 12-year-old Mikaela Hyakuya as well as Akane Hyakuya, the other Hyakuya orphans, or even Yuichiro's parents. He chooses his forms depending on what he believes will be best for breaking Yu's will.

Personality
Asuramaru is a blood-thirsty demon who was originally a vampire. He delights in drinking Yuichiro's blood and goes into a giddy high after Yu feeds it to him for the first time. As a possession-type demon, he is described as particularly nasty and aggressive.

Like all demons, he is manipulative and uses nightmares to consume the one he possesses in order to take over his host's body. At the beginning of the series, he interrupts his host's dreams every night, making Yu tired during the day. After all, the only reason he allows Yu to borrow his power is for the future opportunity to take over his body.

After Yu loosens the curse on him and the two battle for dominance, Asuramaru eventually gives in to Yu's compassion and submits to him. He also stops giving Yu nightmares.

Even so, Asuramaru thinks of humans as vile greedy creatures and says they are even worse than vampires. Although he is fully aware of Yu going insane on the battlefield and of the experimentation done on him, Asuramaru does not reveal any of these vital secrets to his host. Asuramaru is more of a trusted enemy rather than a friend or ally.

History
A vampire who became a demon. Humans managed to seal him within a sword and chained him in place with a curse.

Story
Asuramaru first appears in chapter 6. Lieutenant Colonel Guren Ichinose takes his new recruits into a ceremonial room where the Black Demon Series weapons are located. To enter the contract ceremony, Yuichiro Hyakuya selects Asuramaru's sword. He enters the spell circle and draws the blade to begin the contract ceremony.

Asuramaru immediately thrusts Yu into an illusion where he is surrounded by his slaughtered family members. Asuramaru approaches Yu in the form of a 12-year-old Mikaela Hyakuya and accuses Yu of abandoning them. Yu calls him out as a demon. Letting the form of Mika collapse, Asuramaru stabs Yu and digs into his memories.

He chats with Yu. Yu claims he wants power for revenge, which Asuramaru says he will give him unlimited power for so long as he gives up his love for his friends. Yu then says he needs power to protect everyone. He glows brightly, surprising Asuramaru. Asuramaru says he will obey Yu as long as his heart remains strong and promises to take Yu's body the moment Asuramaru senses any weakness. He informs Yu that Yu is 1/10th not human and suggests humans modified him in some way. When asked, Asuramaru refuses to explain and ends the ceremony.

Forms and Abilities

 * Basic Form: Asuramaru appears as a sword. Even without being called, his power is immense.  When his name is spoken by his bearer, he coats his host in a green aura and becomes even more powerful.
 * Asura-Kannon: A special technique using Asuramaru that materializes dozens of floating swords roughly in the shape of a fan. This type of ability should be impossible for a possession-type demon.

Trivia

 * Upon forming a contract with Yuichiro, he can immediately tell that 1/10th of Yu is not human.
 * Although he often appears as the human 12-year-old Mikaela Hyakuya, he has yet to take the form of vampire 16-year-old Mikaela Hyakuya.

Quotes

 * "I can tweak a heart as weak as yours all that I want."--Asuramaru to Yuichiro Hyakuya, Chapter 6, "Black Asura"
 * "I like strong ones. I like strong desires.  If you want power for revenge alone, then I will give you unlimited power.  (As Akane) But that's not enough, Yu.  You gotta do more.  You have to live for revenge in truth now.  Or else we can't give you any power.  (As Mika) Yeah.  Give up your love.  We hate that more than anything.  We like greed.  We can't stand love.  Yoichi?  Kimizuki?  Shinoa?  Who cares about companions?  Are you going to go off and make new friends... and be happy without us?  That's no fair, Yu.  Only you survived.  We didn't.  You left us to die--"--Asuramaru to Yuichiro Hyakuya, Chapter 6, "Black Asura"
 * "Love and greed intertwined. What an incredible contradiction.  This is why humans destroy the world."--Asuramaru to Yuichiro Hyakuya, Chapter 6, "Black Asura"
 * "You interest me. As long as your heart stays strong, I will obey you.  But if I detect even a moment's weakness, your body is mine.  Do you agree...?  Then, I will be yours.  My name is Asuramaru.  When you want power, cry out my name."--Asuramaru to Yuichiro Hyakuya, Chapter 6, "Black Asura"
 * "You see... There's something strange inside you.  You are about one part in ten... not human.  Maybe other humans have modified you in some abnormal way."--Asuramaru to Yuichiro Hyakuya, Chapter 6, "Black Asura"
 * "Don't trust humanity, Yu. Humans are more frightening than vampires.  Even more frightening than demons.  Heh.  How odd to say that to a human."--Asuramaru to Yuichiro Hyakuya, Chapter 6, "Black Asura"
 * "I will be your power. I will be your blade.  Open your eyes wide... and let your greed grow.  Slice the world wide open, Yuichiro Hyakuya!"--Asuramaru to Yuichiro Hyakuya, Chapter 6, "Black Asura"