Aizono Mio

Aizono Mio (相園美央) is a character introduced in Toaru Kagaku no Railgun (PSP game).

Background
Aizono Mio was part of a project called White Alligator, originally meant to break the limits set in the Parameter List, but developed into a project to mass produce stable Level 4 espers as an alternative to the more unpredictable and uncontrollable Level 5s. The harsh training and conditioning she received during the experiment left her mind unstable.

After the project was shut down, Saitou Souta, a counsellor at Nagatenjouki Academy, helped to restore her humanity. However, due to overwork resulting from having the jobs the rest of faculty didn't wish to do (such as dealing with disatisfied parents) pushed on him, he had an accident and ended up in a coma. The accident was covered up by Nagatenjouki Academy. This led to her seeking revenge on the ones she considered responsible.

Toaru Kagaku no Railgun (PSP game)
In order to carry out her revenge, Aizono Mio manipulated both Mioshi Yoshiko, the hair-cutting lady, to collect DNA samples and the Disciplinary Guides as a source of information. Using this information, she orchestrated the kidnapping of Ichizawa Akiko, in order to acquire the use of Eighth Level Red. As Eighth Level Red required a brainware scan from an authorized user, Mio brought in a Level 2 Telepath, Futaishi Kyousha, whom she had found using the DNA from the hair cut by Miyoshi Yoshiko and had him copy Akiko's brainwaves into his own head (not telling him that it would overwrite his own and leave him a vegetable). Due to the incident, Academy City went to Code Red alert, meaning no one could enter or exit the city, including a group of parents complaining to Nagatenjouki Academy - the ones Mio blamed for what happened to Saitou.

Mio started a fire at the hotel the parents were staying at, disabling the sprinkler systems and fire alarms. She then called the parents in the shelter on the upper floor and told them a way to survive - to throw themselves out of the window, claiming that though the first few would die, after a dozen or so the bodies would form a cushion and allow the rest to survive. As a result, the parents start fighting amongst themselves. After hanging up, she says to herself that she lied and that none of them would survive.

As Misaka Mikoto and Shirai Kuroko attempted to help fight the fire, Mio appeared before them. After talking about her revenge, she escaped as their attention was focused on destroying the rockets fired into the building. Since some of the parents were at a different VIP shelter, a nuclear bunker, Mio intended to use the Eight Level Red, also known as the Magnetic Debris Cannon, regardless of the fact that the city would be destroyed as well.

While waiting at an antenna, having contacted the Hikoboshi II to deploy the Magnetic Debris Cannon, Mio contacted the parents at the shelter to gloat, ignoring their pleas that Saitou would not have wanted this. Afterwards she prepared herself for her own death in the blast. However Mikoto had followed her by tracing the signal and jammed it as she arrived. Unable to convince Mio to call off her plan, Mikoto decided to stop her by force and the two fought.

After being knocked down once, Mio used her ability to form an oil dress and named her ability before making further use of it to attack Mikoto. Mikoto fired a railgun shot at her but Mio withstood it with minimal damage, explaining how she had received anti-railgun training as part of the project (and that those that failed were blown to pieces). She then started gathering napalm in the surrounding area, but before she could ignite it she was struck by one of Mikoto's coins, which she had slipped into the oil and shot from within. Mikoto threatened to go all-out with the next shot if she didn't stop the Magnetic Debris Cannon, however Mio refused to give in and arming herself, launched herself at Mikoto for one final attack before being shot and shocked into submission.

Lying on the ground, defeated and naked, Mio lamented on how everything was over and that the Magnetic Debris Cannon couldn't be stopped at that point. However after some convincing from Mikoto and an offer to help her find and save Saitou, she worked together with Mikoto to create a large railgun to counter the Magnetic Debris Cannon's shot.

Toaru Kagaku no Railgun: PSP SS
After learning about a rumour concerning Saitou's whereabouts from Saten, Mikoto and Mio teamed up to locate him, on the condition that Mio turned herself in once they were done. During their search, they encounter and fight several other White Alligator members.

Abilities
Her ability is Military Oil (油性兵装 (ミリタリーオイル) ), which allows her to break down and reconstruct oils, such as petroleum and napalm. She is able to manipulate the oil to form weapons, such as missiles or arm blades. She can also generate an armour dress which is capable of withstanding a direct railgun hit. She can ignite the oil to launch herself and projectiles at targets, or to cause incendiary damage.