Rei Ayanami is a central character in the iconic anime series Neon Genesis Evangelion. Serving as the First Child and pilot of the Evangelion Unit-00, Rei is a mysterious and enigmatic figure. She is known for her quiet demeanor, pale blue hair, and striking red eyes. Initially, Rei appears emotionless and detached, but as the series progresses, her complex nature and the deeper connections to the other characters and the overarching plot are revealed. Her character plays a crucial role in the unfolding narrative and the philosophical themes of the series.