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Height: 157 cm (5'2")
Code name: Nightmare
Spirit number: 3
Species: Spirit
Angel: Zafkiel
Weapon: Clock type
Astral Dress: Elohim
Affiliation: Raizen High School (temporary)
Hobbies: Killing people, teasing Shidou
Likes: Weaponry, sweets, kitties
Dislikes: Humans, AST
Strength: 109
Consistency: 80
Spiritual power: 220
Agility: 103
Intelligence: 201
Rank: S-Class Spirit
Famous quote: "I want his power. I want to make him mine and become one with him."
Kurumi Tokisaki is the main antagonist in the series. She is the third Spirit to be encountered in the series and is the most dangerous and lethal Spirit. She is heavily obsessed with Shidou and has the ability to manipulate time. Her codename is Nightmare. She has a split personality: that of a gentle, mysterious high school girl with a slow talking pattern, and that of a psychopathic killer. Kurumi is very aggressive in her actions which makes it harder for Shidou to capture her.
Kurumi can be described a person whose personality is hard to read, possessing a well-polished dislike of humanity that borders on mistrust, something she shared with many Spirits in their debut. She is a skilled actress, capable of putting on the façade of an innocent, curious young girl when she needs to, shown when she registered as a student at the Raizen High School, even speaking in a very polite manner; however, under that mask lies a psychotic woman, prone to fits of insane laughter that possesses no regard for human life, regarding them as a food source to restore her own time, and thus, a disposable commodity. There is a twisted justice behind her methods, however, as the people that she brutally murdered were would-be rapists and animal abusers.
In hindsight, Kurumi possesses some degree of innocence that her psychotic behavior have not entirely ruined; she has a soft spot for small animals and other creatures. She once slaughtered four humans not because she needed to replenish her time, but because they were trying to kill a kitten, this is the closest to a humanizing emotion that she has.
Mana reported that Kurumi is the most dangerous spirit known, who has personally killed over 10,000 people which does not include the spacequake's victims within that statistics. Kurumi used unstated and unexplained methods to personally transfer into Shidou Itsuka's high school and classroom so she can get closer to him. Her purposes and reasons in this transfer are simple; consume Shidou Itsuka, in doing so gain their memories, goals, fears and obsessions. In some non-canon stories, the clone Shido seduced shows some "independent" attitude, almost rebellious, and openly acts lovey-dovey with Shido, which causes troubles to the "main" Kurumi and even leads to confrontation with her.