Kanzaki Kaori

An eighteen-year-old magician from Necessarius. Unlike her partner Stiyl, she uses magic to magically strengthen her body. Her sorcery name is Salvare000, "The one being saved becomes the hand that saves". She has long black hair tied up in a ponytail. She also wears a pair of jeans with one side that's shorter than the other side. She uses a two-meter-long nodachi called "Seven Heavens Seven Swords" as her weapon. She has a special attack called Nanasen that uses her sword and some wires. She used to be a kind woman who treated Index like a sister, but when Index's memories were deleted by Necessarius, Kaori changed into a cold and silent woman as Index no longer remembered her and consequentially did not trust her.

Later in the novels, more of her past is revealed. Not only is Kaori a skilled swordsman, but she is a Catholic possessing the "Stigma"- the ability to call upon God's power- and the former leader of the Amakusa Catholics; however, Kaori left the group as she resented that she had been fated since birth to become its leader, which led her to despise the concept of luck and fortune as her fortune in turn only bring misery to those around her from what she can see, as it has been mentioned in the novels she no longer wants to see innocent people rushing to protect her, dying in the process, and saying with their last breath that it's alright as long as she's fine. Although she is Catholic, she joined Necessarius as it's a group which even her fortune won't rob them of their lives and befriended Index, developing a sisterly relationship with her. The repeated failed attempts to make Index remember her after each memory erasure resulted in her cold personality as Kaori began to accept that no matter how much a person tries, no one can change their destiny. She begins to show a kinder side to herself after Tōma saves Index and gradually falls in love with him after he helps her face her past with the Amakusa Catholics, becoming more prone to showing emotion and sometimes showing a little embarrassment if she is with him, though many of them are awkward interactions from her trying to thank Touma for saving the members of the Amakusa Church on various occasions and Tsuchimikado Motoharu's attempts to encourage Kaori into various cosplay gear. Note that some of the 'cosplays' Motoharu suggested are maids, angels, fallen angels and/or ero versions of one or more of them.

Also, from the SS light novel (also known as volume 13.5), from what Tatemiya Saiji said as a excuse to decline the Captain of the Knights of England invitation to a ball "Kanzaki-sama only likes younger men", it's now became a rumour that spread across half of London that Kaori has a crush on Kamijou Touma, which doesn't seem to be false from their various interactions between the two. Even people like Laura Stuart make fun of Kaori using this rumour.