Kinuhata Saiai

Kinuhata Saiai (絹旗 最愛) is a minor character in the Toaru Majutsu no Index series. She is a Level 4 esper and is an operative of ITEM, an organization led by Mugino Shizuri. She later becomes ITEM's leader in Volume 19, after Mugino's defeat at the hands of Shiage Hamazura in Volume 15.

Personality
Despite being a powerful Psychic, Saiai is one of the most mellowed-out characters in ITEM; she isn't a screw-up like Frenda, nor is she as frightful as her leader, Mugino. She enjoys B movies and likes to tease others, Shiage in particular because of his reaction to anything sexually suggestive.

She also likes to add "super" (超, chou) to her remarks.

Background
Saiai was previously part of the "Dark May Project"- an experiment that used subjects that were most likely Child Errors in an effort to replicate Accelerator's powers. It is unknown whether or not Saiai herself is a Child Error.

Level Upper Arc

 * Main article:Level Upper Arc

Saiai and her comrades in ITEM appear in a Joseph's Coffee and Restaurant. In both the manga and the anime adaptation, she can be seen here reading a magazine. In the manga, they argue about whether or not they should all go to a pool since it's summer when they take notice of the Level Upper treatment program being broadcasted all over Academy City.

Sisters Arc

 * Main article:Sisters Arc

She and ITEM are later seen finishing up one of their missions while still arguing over the swimming pool debate, when Mugino gets a call to protect a research facility that is being targeted by Misaka Mikoto. Mugino orders Saiai to check the establishment and find out if the attacks are simply a diversion. Saiai observes this to be true when she discovers and detains Nunotaba Shinobu who was trying to install certain emotions into all the Sisters, but Shinobu unltimately fails as Last Order had acquired all the data, thus stopping it from spreading throughout the network.

Saiai is later seen calling Mugino (who is in a fierce battle with Mikoto) to tell her that their part in the mission is done. After this, she appears once more, telling Frenda on the behalf of Mugino that Frenda should be prepared for punishment.

Later Events in the Novels
Saiai and ITEM make their debut in the Toaru Majutsu no Index series in Volume 15. Here, they and Shiage lounge in a Joseph's Coffee and Restaurant while discussing SCHOOL's assassination attempt on Oyafune Monaka. ITEM's controller soon contacts Mugino and orders ITEM to investigate the Virus Isolation Center, but Mugino decides to investigate Kirigaoka Girls' Academy instead in an attempt to intercept and eliminate SCHOOL.

She later appears in one of ITEM's hideouts in District 3, regrouping with everyone in ITEM minus Frenda. When Takitsubo Rikou uses the Body Clear drug to activate her ability, Saiai sympathizes with Rikou's handicap. As SCHOOL ambushes ITEM, Saiai uses her ability to secure a path for Shiage and Rikou, managing to subdue a number of SCHOOL's lackeys and take out Sunazara Chimitsu. She then finds herself facing Teitoku Kakine, and learns that Frenda had sold out ITEM before Kakine defeats her easily.

Kakine drags Saiai's unconscious body with him when he finds Shiage and Rikou. When she regains consciousness and sees Shiage worrying over Rikou, she orders him to take Rikou and flee, saying with a slight smile on her face that ITEM has no use for useless people like him and Rikou. Before he leaves, Shiage asks if he can do anything for Saiai; she requests an information suppression team and an ambulance since she can't move, to which he complies.

After the events of Volume 15, she's seen with Hamazura Shiage and Takitsubo Rikou after their boss was supposedly killed. She is later hunted down by Stephanie Gorgeouspalace.

In Shinyaku Toaru Majutsu no Index Light Novel Volume 01, she is reunited with her friends from ITEM after the events in Russia. She later confronts the mysterious student, Kuroyoru Umidori, at this point it is revealed that Saiai was the "honor student" of the Dark May Project.

Ability
According to Kakine, Saiai is a leftover from the "Dark May Project", whose aim was to create a personal version of Accelerator's ability by using a similar pattern of ability operation, using the cognitive patterns of Accelerator himself as reference in order to optimize the Personal Realities of certain espers taking part in the experiment. Though the details are not mentioned, she only succeeded in creating an automatic self-defense capability that activates when she's attacked. Her ability is the Level 4 Offense Armor (窒素装甲), which allows her to control the nitrogen in the atmosphere in order to create a few centimeters of solidified nitrogen that act as a barrier. She can use the barrier to attack and defend. Like Accelerator's AIM vector shield, the primary function of her ability is to create an armor of super-compressed nitrogen around her, as demonstrated in Volume 15 when she fights Sunazara, where Academy City's special sniper rifle is shown to have no effect on her other than knocking her back a little. Because of her ability, she carries around a small canister of nitrogen for use at all times.

Her power is so exceedingly great that she can even control compressed masses of nitrogen in order to lift up a car and deal powerful blows. However, her effective range is very small as it only extends a few centimeters from her palm. She can also use her ability to propel objects, as demonstrated in Volume 15 when she outsniped Sunazara who was over 500 meters away, where she used a portable anti-tank missile with great accuracy.

Trivia

 * In the novels, she is described as a very short woman that might look no older than twelve years old; however, some of her line art depicts her as rather tall for a teenager.
 * She was the one that gave his first ITEM related job to Shiage, and consisted in creating a fake ID to bypass her unability to watch a high rating horror movie. Furthermore Hamazura was forced to watch the movie with her.

Quotes

 * "My Offense Armor won't break to mere guns." - Railgun Manga Volume 5, to Shinobu
 * “So bunny girls are a super hit with you, Hamazura?" - Volume 15
 * "Oh, so you even super looked into all the people Hamazura knew? Yanderes can be super scary". -- New Testament 1, as she noted that Mugino had a certain level of knowledge about Hamazura's friends.