Dark Nia or also know by her original name Nia Honjou is a minor antagonist in Date A Live franchise and is the 3nd Inverse Spirit to appear on the series. She is the true demonic form of the Spirit, Nia Honjou, and serves as a major villain in Volume 13. Like Dark Tohka who became a villain due to Isaac Ray Peram Westcott's cruel actions, Dark Nia is just one of the many of his victims.
Nia was once an ordinary human. However, around 27–28 years ago, because of unknown reasons, she bonded with the Sephira Crystal containing Rasiel, turning her into a spirit. She also seems to have lost her memories because of unknown reasons.
While at first causing spacequakes like the other spirits, at some point Nia was able to reintegrate herself with society. However, curious about where she came from, she used her angel Rasiel and found about her former life. Following this, Nia started to use Rasiel to find information on everyone she encountered. As a result, she discovered the dark side of humanity, causing her to believe she couldn't trust anyone. Because of this Nia fell in love with the 2D world of manga and video games, since the characters in there could never harbor negative feelings towards her. However, she still wanted to live in society so contact with others was unavoidable. As a result, Nia started to treat others as if they were just characters in a video game, communicating with them but having no real interest in them as people. Nia especially liked a manga called "Chronicle" and its main character Tokiya. Around 10 years ago, she was able to get a job as a manga artist under the pen name of "Souji Honjou". The Manga written by her, "Silver Bullet", ended up becoming a hit.
However, around 5 years ago, Nia's existence was discovered by Deus.Ex.Machina Industries, who send Ellen Mira Mathers after her. Ellen managed to defeat Nia and capture her alive by catching her by surprise through a sneak attack. The fans of her manga only knew that she had disappeared and it was believed to be because of an argument between her with her editor. While in DEM's captivity, Isaac Westcott and Ellen put Nia through horrible physical torture to make her go into her Inverse Form. However, no matter what they did she did not Inverse.
After the manga battle, the sealed Spirits told a story to Nia about how they changed themselves after meeting Shido brought Nia to her tears and decided that she would give Shido a second chance date. However, at that moment, Westcott released the Realizer he had installed in Nia’s brain, forcing her to remember all the torture she endured when she was still in DEM. Unable to handle the shift from hope to despair, Nia began to go inverse.
Nia was unable to control her actions and summoned her Demon King, Beelzebub, to unleash a swarm of shadow creatures from the it’s scattered pages. While the Yamai sisters, Miku Izayoi and Tohka were busy fighting Ellen Matthers, Nia used Beelzebub’s ability to manipulate the future to redirect Natsumi, Origami Tobiichi, and Yoshino’s angels against their owners. As everyone became restrained, Shido had awoken the powers that he had started getting a feeling for by remembering the time he went berserk during the beginning of the month. He attempted to awaken Nia’s consciousness by using Gabriel's ability. While it seemed to have an effect, Artemisia Bell Ashcroft came out of the shadows and stabbed Nia with her sword. She was also able to use her territory to extract Nia’s Qlipha Crystal through unknown means. The crystal was then absorbed into Westcott, who stole Nia’s ability to use Beelzebub.
Westcott, however, decided to retreat after he had Nia's Qlipha in possession and also because he wanted to have the fun for later. The crystal extraction left Nia at the brink of death but fortunately, Tohka noticed that Nia still had some spirit powers left. Kotori noted that it was because the extraction wasn’t complete since Shido was able to awaken some of her consciousness beforehand. It was then Shido decided to seal Nia, hoping that the cycle of Spirit Power between him and the other spirits would heal her. The endeavor was a success, and Nia slowly thanked Shido before closing her eyes again.
- Since Isaac Westcott now have Beelzebub, the Demon King now is in his body.