Aya Brea is a strong-willed American police officer and a Mort that is known to be fighting mutant biological monstrosities and horrific creatures with an arsenal of weapons in order to prevent the human and animal apocalypse.
As she reveals to Gary Douglas, due to being half-Japanese, her first name is of Japanese origins (アヤ・ブレア), possibly meaning "design", "colorful" or "beautiful".
Aya is portrayed as a strong-willed, intelligent and honest heroine. Although quiet on the surface, she can be very stubborn and unyielding, occasionally entering arguments with Daniel because of her stubborn nature. Aya is meek in nature and does not boast about being a hero or possessing superhuman powers. While Aya is mature, she also tends to be pretty sarcastic, cold, and brooding, with a sardonic sense of humor. It doesn't help that Aya has a bad habit of not being able to take people seriously sometimes, particularly when they express any sort of interest in her; she tends to brush them off. Sometimes it's easier for her to pretend that people are just being insincere most of the time.
Aya can be sensitive, compassionate, kind, gentle and nurturing, almost maternal — especially with children. She does like kids, regardless of the fact that she's never had any herself and she treats Eve Brea in a caring, motherly manner. She approaches with a welcoming nature to most people. Eve and Kyle are essentially her "family".