Pino Mayer is a key character in the anime series Ergo Proxy. She is an AutoReiv companion model originally serving the Mayer family before contracting the Cogito Virus, which grants her self-awareness and individuality. Pino accompanies Vincent Law and later Re-l Mayer on their journey, providing a childlike innocence and unique perspective on humanity. Her playful demeanor often contrasts with the series' dark atmosphere, and her evolving sense of identity plays a significant role in the narrative’s exploration of consciousness and existence.