Nyx

Nyx is the Primordial Goddess of the Night and the sister of Erebus in Greek mythology and one of the creators of Thanatos, Hypnos, and Oneiroi.

Appearance
Nyx is a beautiful young woman with a cute face of a child that has long black hair and with pointy ears. She wears a cute frilly dress called Godly Virgin Killer Clothes that has a corset jumper skirt. Her body also give out a tremendous dark aura.

Personality
Nyx is a cheerful yet a sadistic person who enjoys seeing others in pain and suffering. After receiving her special garment, Nyx became arrogant enough to believe she is untouchable by those who are virgins. But despite this, Nyx is shown to be honorable as she accept her defeat at the hands of Issei with a satisfied smile and shares information about Hades.

She is not above praising others such as Rias being worthy of being Issei’s king because she figured that Nyx was waiting for Issei to attack her.

History
In the past, Nyx and her brother Erebus created Thanatos, Hypnos, and Oneiroi.

Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh Academy
Nyx was mentioned in Volume 24 along with her brother Erebus, who were arriving in the Realm of the Dead for Hades’s meeting.

Nyx made her first appearance in Volume 25, she and Erebus trembled at the sight of Issei Hyoudou’s fury towards Hades for sending Grim Reaper to attack his father Gorou Hyoudou.

Nyx appeared in True Volume 1, appearing at the uninhabited beach where Issei and his group planned for their summer vacation while also dyeing the sky black with her dark aura and breaking through the barrier they placed on the beach. Nyx introduces herself to the group and she sees Issei turning into his Crimson Armor and laughs as she heard rumors about Issei being perverted and he doesn’t let his guard down. She senses Issei’s dragon aura and considers it frightening and was asked by Issei what she is planning to do with Ingvild and she answered that Ingvild possesses the Longinus that allows her to control the sea and dragons and she wants the strength to master dragons. Believing dangerous dragons like Issei, Vali Lucifer, and Crom Cruach would be a serious threat to her and her allies and she would find entertaining of controlling Ophis and Great Red and Issei refuses to let her use Ingvild and attempted to use Pailingual on her to speak to her breast but it was not responding. Nyx laughs saying she took actions the Oppai Dragon and Issei this time attempts to use his Dress Break to destroy her clothing but he was stopped by Rias who figured out that Nyx is waiting for Issei to use Dress Break. Nyx smiles and praises Rias for being worthy to be the Red Dragon Emperor’s king and revealed she is waiting for his attack because it’s the easiest way to kill him and revealed her that her clothes is made to fight Issei and it is named Godly Virgin Killer Clothes.

Nyx began to unleash her dark energy and look at the group with contempt and tells them that she and her group receive information that Issei is a virgin and carefully not to pass the attacks of virgins. She warns Issei if he is a virgin and touches her, he will attack the curse of her clothing and will kill him and his abilities won’t work. Issei tried to shoot Nyx with his Dragon Shot but it was ineffective, shocking Issei and the group. Nyx turns her attention to Ingvild and uses her brainwashing technique and give her a order to sing, causing Issei and Ddraig to suffer in pain and laughs at him. Nyx maliciously tells Issei that she is manipulating Ingvild in order to control her Sacred Gear and if she gets sent to Grigori again, she’ll eventually get kidnapped again. Nyx warns Issei if he wants to save Ingvild he’ll need to defeat her and even if he cancel the brainwashing technique she put in her, it will soon activate a different protection. She then departs from the group by jumping into the sky and the dark sky returned to normal.

Powers & Abilities
Immense Strength: As a Primordial Goddess of Greek mythology, Nyx is a very powerful goddess.

Immense Darkness: As the Goddess of the Night, Nyx can take form of a spinning dark aura and is capable of cover the whole area with the darkness of the night and destroying magic barriers. She can also unleashed black wave of darkness out of her hand.

Olympus magic:

Demon Summoning: Nyx is capable of summoning two thousand demons to fight against her opponents.

Equipment
Godly Virgin Killer Clothes: A special clothing given to her by the Gods of Hell which allows her to be immune to the attacks of virgins.

Trivia

 * Nyx is the first goddess to fight Issei in battle.