Zero

Zero is the elder sister of Lord Kirinmaru who informed her brother of the prophecy the Shikon Jewel had predicted, that he would meet his demise at the hands of beings that are neither human nor demon and an impossible entity surpassing time itself.

As such she wants Sesshōmaru and Rin's half-demon twin daughters, and Inuyasha and Kagome Higurashi's quarter-demon daughter dead to prevent the prophecy's fulfillment.

History
She was given a premonition by the Shikon no Tama that the ones who can stop her younger brother are beings that are neither human nor demon and an impossible entity surpassing time itself (there is the possibility that the Half-Demon Princesses could be those beings), therefore she ordered two of the three princesses to be destroyed to prevent this prophecy. She is responsible for the separation of Sesshōmaru's and Rin's young twin daughters ten years ago, having tasked Homura to burn the forest in which they were living to eradicate them. As she asked Sesshōmaru how his mother was it's implied they knew each other. The Rainbow Pearls were created from Zero’s tears when she cried after having heard Inu no Taishō died from protecting his human wife Izayoi and his hanyō child Inuyasha. Zero then lost all her demonic power which now are contained in the Rainbow Pearls.

Personality
Zero is a mysterious demon. She is quite calm whenever disaster and death is afoot, similar to Sesshōmaru whom she has a connection with. It seems that Zero is also loyal to her brother and is ready to ruthlessly destroy any threat in his way, even innocent children.

Zero had feelings for Tōga, but was humiliated by him at some point in the past, and started to dislike his kin. Zero cried upon learning of Tōga's death, she wept unconsolably and wished the Shikon no Tama take her feelings away. It granted her wish and created the Rainbow Pearls as a result.

Physical Description
Zero appears as a beautiful, tall and slim woman. She has very pale skin with pointed ears, dark green eyes like Riku's, and a large volume of greyish hair. She has curved purple stripes beneath each eye, a magenta stripe on each eyelid and dark lipstick. Originally, the purple surrounded her eyes. Her hair is bound up in the traditional Oriental style, typically worn by nobles, secured by multiple gold hair sticks. A similarly gold comb holds back her fringe while her hair at the back is folded up and secured with a blue, butterfly wing clip.

Powers & Abilities

 * Shapeshifting: Like her brother, it is unknown if Zero possesses a true youkai form, like Tōga, Sesshōmaru, and his mother has. She is currently of human form.
 * Longevity: As a demon, she is capable of living for many centuries and has remained unchanged between the two times the Grim Comet traveled close to Earth - which has 500 years of difference.
 * Shikigami: When Zero approached Sesshōmaru, he cut her in half, revealing her to be a mere paper demon puppet, suggesting she has the ability to cast spells and possibly possess magical powers relating to Oriental divination. (The belief of shikigami originates from Onmyōdō, a system based on the Chinese philosophies of yin and yang and the five nature elements.)
 * Stolen power: When she encountered Miroku, she was able to easily steal his seal power.
 * Levitation: She can hover motionlessly above the ground.
 * Azusa no Yumihari: A Webbing based ability that acts as a binding agent to not only restrain movement, but also link the fate between caster and target.

Former Powers

 * Demonic Power: Upon the creation of the Rainbow Pearls, Zero's demonic power, along with her heart and grief, were stored away into the seven pearls. She even renounced her identity as a demon.

Weapons

 * Staff: Zero wields a staff that has a spider emblem on it. It can shoot spider webs and blasts of purple energy from it.

Relationships
Lord Kirinmaru of the eastern mainland is her younger brother. Once awakening him from his centuries slumber, she informs him about Sesshōmaru's decision to take a human as a bride just like Tōga married Izayoi, which naturally surprises and disgusts him. She then reminds her brother about a prophecy predicted by the Shikon Jewel before it was disintegrated that will bring about his inevitable demise at the hands of beings that are neither human nor demon, and an impossible entity that surpasses time itself.
 * Kirinmaru

In Episode 22, Tōga was a good friend right after he and Kirinmaru destroyed the Grim Comet. In Episode 15, Zero stated that she had strong feelings for Tōga, but the dog daiyōkai humiliated her, leading a massive revenge plot towards the Great Dog Demon's whole family, including Sesshōmaru, his half-demon daughters Towa and Setsuna, Inuyasha, and his quarter-demon daughter Moroha. When the Great Dog-Demon lost his life that he fought Takemaru, Zero grieved deeply as she believed that they were meant to walk the path of eternity together; a destiny that the Shikon Jewel itself had prophesied.
 * Tōga

Zero has known the leader of the Ka Demon Tribe for centuries. She had asked for her aid in killing Sesshōmaru's newborn twin daughters to prevent the prophecy of Tōga's predicted by the Shikon Jewel from being fulfilled. Her arms were sliced off by Sesshōmaru's energy whip, and lost the gold and silver Rainbow Pearls to him, demanding that he give them back to her, claiming that they were the gems of her tribe.
 * Joka

Fourteen years later, she intended to take vengeance on him for taking the Pearls from her, but had failed when Setsuna had killed her.

It seems that she does not care about him much, thinking that he is an indolent person. She did not seem pleased that her brother had been leaving the situation in his hands, as she may be aware that Riku is after all seven Rainbow Pearls.
 * Riku

Zero's relationship with her brother's top minions has not yet been explored.
 * The Four Perils

Enemies
She mentions Tōga's youngest half-demon son upon her brother's awakening, and that he will become father to a quarter-demon daughter soon. She was more than pleased when Kirinmaru said that he would leave to slay Inuyasha, his human wife, and their newborn daughter all in one fell swoop.
 * Inuyasha

She naturally mentioned the reincarnation of the legendary priestess Kikyō because she is a mere human. She then informed her younger brother that Kagome, the girl who had surpassed time itself, would become a mother to a quarter-demon daughter who would ultimately bring about his destruction along with her twin cousins.
 * Kagome Higurashi

One of Kagome and Inuyasha's friends who sealed Setsuna's demonic powers.
 * Miroku

She has known Tōga's eldest son for many centuries. Finally aware of his decision to take a mere human woman as a bride, just as his father had, she eventually reappears before him and expressed her interest and disdain in siring half-demon twin daughters of all things. She had been searching for the twins who will bring about her brother's destruction for four years, and succeeds via the dream-gazing spell. She then orders Homura the fire-demon to burn the entire forest and destroy Sesshōmaru's daughters, making sure that he cannot intervene to save his young twin daughters from her or her younger brother's wrath.
 * Sesshōmaru

TBA
 * Sesshōmaru's mother

Zero knew that Sesshōmaru is married to Rin and plotted to go after her, being the human mother of Sesshōmaru's twin daughters. To keep Rin from getting involved with Zero's possibly malicious plans, Rin was sealed within the Sacred Tree of Ages. However it is implied that if Zero is killed, Rin will also die with her. To ensure that, a spell was cast by Zero possibly before Rin was sealed.
 * Rin

Zero is the one who wishes to end the lives of the three girls, out of fear of the Shikon no Tama's prophecy becoming true. She undoes the seal that restrains Setsuna's demon blood with the intention of giving Kirinmaru a reason to go at them at full power.
 * Towa, Setsuna and Moroha

Two Centuries Years Ago

 * "When will he learn to compromise? He troubles us to no end. If he weren't so obstinate, we'd already be ruling the land."
 * "I don't want demon powers. I don't want this grief. In fact, I don't even want this heart! Shikon Jewel, please grant my wish! These seven Rainbow Pearls contain my demonic powers as well as the powers of the Shikon Jewel. Now I am no longer a demon."
 * "About what?"

Fourteen Years Ago

 * "It's been awhile, Lord Sesshōmaru."
 * "Word is it you had twins. Or was it half-demon twins. I can already picture the look of surprise on Lord Kirinmaru's face. The great Sesshōmaru, known to despise humans and half-demons, has taken a human woman as his wife. Perhaps you should hide your precious daughters before he awakens."
 * "Oh, you remembered my name? I'm flattered."
 * "Once the the lunar eclipse ends, the Grim Comet will appear after five hundred years. You should use your Bakusaiga then. However, as someone who was humiliated by your father, I'd be lying if I said I didn't want your entire family to suffer in agony."
 * "As expected of Lord Sesshōmaru."
 * "Sesshōmaru has taken a human woman as a bride. Just as the Great Dog Demon did."
 * "At this rate, Sesshōmaru will be plunged into disaster and fall to ruin. And he has sired daughters, half-demon twins. Do you remember? The Shikon Jewel may be gone now, but it still left us a prophecy: Kirinmaru, you will be felled by an existence that is neither human or demon, and an impossible entity surpassing time. That is what will defeat you. You laughed it off, saying no such thing can exist. But thanks to the Great Dog Demon that which should not exist has become reality. That is the half-demon, a being that is neither human or demon. And a quarter demon daughter will soon be born between Kagome, the girl who surpassed time appear in this world, and Inuyasha. If we do not end those cursed half-demon twins and abominable quarter demon, just as the Shikon Jewel prophesied, you will meet your end."
 * "Oh, is Sesshōmaru going to lend a hand?"

Ten Years Ago

 * "I finally found them using the dream-gazing spell. Homura, burn down that forest."
 * "That is fine with you, right, Lord Sesshōmaru?"
 * "Erase those cursed half-demon sisters from the face of this world."

Present Day

 * "Two of the Four Perils have been defeated, and still you won't do anything?"
 * "You were supposed to kill Sesshōmaru's daughters for me."
 * "Yes, you were."
 * "You're leaving things to him?"
 * "Such an indolent person."
 * "Without the silver Pearl protecting her, she will fall easily into my trap."
 * "You're right, I'm no ordinary human. Otsuyu is a fake name. My name is Zero. I am Kirinmaru's older sister."
 * "It looks like you can still differentiate between enemy and ally, but it's only a matter of time."

Trivia

 * In the second opening BURN, she is seen fighting against Setsuna with her powers.
 * She knows the contents of a prophecy that foretells the downfall of Lord Kirinmaru, similar to the Fates reveals the future, from the 1997 film Hercules.
 * She is just like the character Hades.
 * In Sesshōmaru and Kirinmaru, it is revealed that she was the one who had created the Rainbow Pearls due to successfully separating a great demonic power into seven pearled fragments and scattering them throughout the lands to ensure that such a supreme demonic power would never ever be used fully.
 * Due to not being chosen by Tōga, Zero resents those who have inherited his blood.

Media Appearances

 * Episode 14 (Hanyō no Yashahime)
 * Episode 15 (Hanyō no Yashahime)
 * Episode 17 (Hanyō no Yashahime)
 * Episode 18 (Hanyō no Yashahime)
 * Episode 21 (Hanyō no Yashahime)
 * Episode 22 (Hanyō no Yashahime)
 * Episode 23 (Hanyō no Yashahime)
 * Episode 24 (Hanyō no Yashahime)

Zero Zero