Rie Petoriyacowa is a character from the anime Agent Aika, where she serves as an antagonist. Information regarding her background is limited, but she is identified as a member of a special rapid response unit known as the Golden Delmo, alongside other members including Bianca, Sania, and Tonya.

Rie has a focused and determined personality, particularly evident in her approach to combat. Her primary motivation is to study and analyze the fighting style of the protagonist, Aika, with the explicit goal of developing effective countermeasures against her. This indicates a strategic and analytical mind, as well as a strong professional dedication to her role within the Golden Delmo.

In the story, her role is directly tied to this unit, positioning her as an adversary to the main character. Her key relationships are primarily with her teammates in the Golden Delmo, as they operate together as a coordinated group. There is no substantial information available about her development over the course of the series.

Physically, Rie is recognized by her long black hair that extends past her hips and her green eyes. Her appearance suggests she is a young adult or teenager. Specific abilities are not documented in available sources.