Kinuhata Saiai

Saiai Kinuhata (絹旗 最愛) is a member of ITEM, led by Mugino Shizuri. She later becomes it's leader in Volume 19, after Shizuri's defeat in Volume 15 at the hands of Shiage Hamazura.

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

Level Upper Arc
Saiai and ITEM first appear in a Joseph's Coffee and Restaurant arguing about going into a public or private booth. In both anime and manga adaptations, she can be seen reading a magazine during their first appearance. ITEM are later seen to take notice of the Level Upper treatment program, which is being broadcasted all over Academy City.

Sisters Arc
They are later hired to protect an establishment from Misaka Mikoto, involved in the Level 6 Shift in the production of Mikoto clones. Shizuri orders her to check the establishment if the attacks were simply a diversion, and as such an inside attack is possible. Saiai observed this to be true, as she discovers and detains Nunotaba Shinobu who was trying to install certain emotions into all the sisters, however she failed as Last Order has acquired all the data, and stopped it's spread throughout the network.

She later calls Shizuri (who is in a fierce battle with Mikoto) that their part is done, she later tells Frenda on the behalf of Shizuri that she should be prepared for punishment.

Toaru Majutsu no Index
Introduced in volume 15 along with her teammates.

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

Ability
According to Teitoku Kakine, Saiai is a leftover from Project Mayday of Darkness whose aim was to create a personal version of Accelerator's ability by using a similar pattern of ability operation. This is done by referencing the cognitive patterns of Accelerator himself 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 a automatic self-defense capability if she is attacked. Her ability was the Level 4, which she uses to control the nitrogen in the atmosphere and create a few centimeters of nitrogen barrier she could use 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, she fights a sniper in volume 15 and Academy city's special sniper rifle is shown to have no effect on her other than knock her back a little. Because of her ability, she carries around a small amount of nitrogen for use.