She is a prototype model YoRHa android that was used in order to create the superior 2B and 9S. She doesn't like to speak and often keeps to herself
Three years prior to the events of NieR: Automata, she was a member of the first YoRHa squadron deployed to Earth as part of the Pearl Harbor Mission. Her alias at the time was No2 but is referenced in Automata as "Number Two".

A2 is initially depicted as mysterious and taciturn. However, it is eventually shown through her interactions with Pod 042 that she possesses an aggressive and fiery personality. She has a propensity towards reckless behavior as she will dive head-long into dangerous situations without consideration for strategic evaluations or her own personal safety. When speaking to others, she tends to be blunt, impatient and foul-mouthed.

Occupation: YoRHa (Formerly) Race: YoRHa Android Sex:Female Model Age: Unknown Height: 5'6 168cm (including heels) Weapon of choice:One-Handed Swords, Two-Handed Swords Hair color: Silvery White Eye color: Light Blue.