A.B.A

From a mountain home named "Frasco", A.B.A is an artificial life-form, or homunculus, the creation of a scientist who lived within Frasco. However, before her 'birth', the aforementioned scientist was taken away by the military, which was planning to use his skills for unknown reasons. When her eyes opened for the first time, A.B.A found herself alone within Frasco, and lived the first 10 years of her life in total isolation. Escape from Frasco was not impossible. Nevertheless, A.B.A quickly realized that she had no knowledge of how to exist outside of her home. To find relief from her sadness, she began to collect keys of all kinds, as they represented the opening of a bold new world and an escape from imprisonment. While roaming outside one day, still tired of her isolated life, A.B.A stumbled upon an ancient relic known as "Flament Nagel". It was love at first sight, as the war relic was shaped like a key, A.B.A decided to keep him as her partner; she renamed him "Paracelsus". Her new goal was to acquire an artificial body for her newfound partner. Source: Guilty Gear wiki/wikia