Amai Ao

Amai Ao (天井 亜雄) is a minor antagonist in the Toaru Majutsu no Index series. Originally a researcher of the First Production Plan of the Sisters Project to develop military clones of Misaka Mikoto, he was later brought back into the project after it was reused for the Level 6 Shift experiment.

Background
He was a researcher and the superintendent during the First Production Plan of the Sisters Project and specialized in creating personality data with self-learning capabilities, however, he was soon relieved of his duties after it was discovered there was a flaw in the plan, as such he spirals into debt. Ao was later called back after the project was reused for the Level 6 Shift experiment, and was tasked to direct the experiments. During the experiments, Ao invested greatly on the project, hoping for a return of his investment after the experiment has been concluded.

He later associates himself with outside organizations, such as the Science Association, that are opposed to Academy City to increase his chances to pay his debts.

Appearance
Amai Ao has a skinny build, and has a gaunt look on his face, which is amplified by his long wavy and greasy-looking black hair. He is always seen wearing his labcoat, even after the experiments has ended.

Sisters Arc

 * Main article:Sisters Arc

He appears in the Sisters Arc in the Toaru Kagaku no Railgun sidestory, where he objects to the manager of the project for distributing the experiment to various facilities. Ao worries about the interests of the project being split-up, but is calmed by the manager after he explains to him that those who will receive gains from the experiment are the one who are still running it at the time of the project's completion. He leaves his office shortly therafter.

After Touma defeats Accelerator and ending the experiment, Ao becomes heavily indebted due to investing on the project and plans to move to a rival organization outside of Academy City. He later implants a virus into Last Order a few days after the end of the project, which would order the clones under the command of Last Order to attack people. Despite this, he did not anticipate for her to escape her incubation chamber, which puts his plan into jeopardy. He later tells the research institute that he is taking a vacation while he searches for Last Order, who eludes him for a week.

LOL

Design evolution
Despite being 30 years old, Amai Ao is described by Haimura as a young researcher like Kihara Amata. His sketches for Ao has been lost digitally but can still be seen in his artbook, rainbow colors spectrum.