Mugino Shizuri

One of the seven Level 5 espers, ranking fourth after Mikoto Misaka, and is one of the antagonists in the Toaru Kagaku no Railgun manga.

She is the leader of ITEM, which is at odds with SCHOOL, which is led by second-rank Level 5 Teitoku Kakine. She looks down upon lower-level espers and does not mind eliminating people who get in her way or go against her, regardless of whether they are allies or enemies. Her overconfidence eventually results in her defeat against a Level 0 drop-out (Hamazura Shiage).

Plot
Prior to the events of the novel, she and her group are hired to stop Misaka from destroying the facilities involving the experiments with the Misaka clones and Accelerator. She fights Mikoto who proves to be a clever opponent and pushes her close to death. While she was gaining the upper hand Mikoto makes use of Frenda's traps in the facility and destroys the platform they stood on, dropping to the bottom despite Mikoto's generosity of throwing her a line. She survives the fall and apprehends some of the scientists and finds out about the Level 6 Shift Program and decided to let her be.

Volume 15 of the series is her and ITEM's first appearance in the main story line. She and her group lead a rebellion in Academy City, fighting off other rival groups.

During the events of Volume 15, she loses her left arm and part of her right eye to Hamazura Shiage. In Volume 19, they are replaced with masses of energy with the help of her own power. She is currently after Hamazura and wants revenge, however, she assisted him in escaping to Russia.

Personality
Mugino may seem gentle and kind, but in reality she's a sadistic, battle-hungry fighter who looks down on all she deems weaker. She does show a little compassion towards her teammates, but she would get rid of them in a heartbeat if they got in her way. Later in the series she develops a rather twisted personality after Hamazura defeated her, it resembles a Yandere crush in which she has marked him as her prey and hers alone.

Abilities
Her ability is, which converts electrons into unstable destructive matter. She can use her ability to fire up to four laser beams at once, create a defensive shield that can melt/disintegrate steel, and supposedly her ability even grants her the ability to turn intangible like energy, and phase through attacks. She carries around silicon cards that can disperse her laser shots into multiple ones.

Unfortunately, her ability is highly unstable, as demonstrated when her arm and right eye was lost when she used too much of her power.