Aya Brea is a character in Parasite Eve and its sequels.
Aya Brea was born in Boston, Massachusetts on 20 November 1972. She had a sister named Maya who, along with her mother, died in an automobile accident around December 1977. After Maya's death her organs where preserved and one of her cornea's was transplanted into Aya, Unknown to any of the doctors, Maya's malevolent mitochondria began changing Aya and Melissa's genetic structure. As a young woman Aya studied criminology at the University of Virginia and was involved in their ROTC program, though no record of military service is ever mentioned within the game. Aya then later became a Detective with the fictional NYPD 17th precinct. Within the first six months of working at the precinct, Aya became involved in an event known as the New York Blockade Incident. As an officer, she held a sort of father/daughter relationship with her partner, Daniel "Bo" Dollis, a veteran cop who is protective of her.
A few months after Eve's rampage in New York, Aya left the force and joined a newly-formed branch of the FBI known as the Mitochondrion Investigation and Suppression Team or MIST based out of Los Angeles. The purpose of MIST is to hunt down and destroy any remaining NMs.
During her time as a MIST Agent, Aya had always worked alone due to the abnormality of her powers. However, though she chooses not to use them, she cannot truly hide them; she is never sick and appears younger than her biological age, as her "awakened" mitochondria find a young, healthy host advantageous and actively maintain her body in its early twenties. These psychological factors have acted as a mental block on her abilities, rendering them amazingly weak. In early September 2000, Aya was following a lead to a tiny town called Dryfield in the Mojave Desert. Aya soon discovered a strange shadow government facility called Neo-Ark where scientists were using Aya's DNA to breed a race of Artificial Neo-Mitochondrial Creatures. To control the ANMCs.
She is set to return in the 3rd Birthday.