Rei Ayanami is a 14-year-old girl. Rei has short pale blue hair with bangs centered to the middle, Rei's eye color is red. Rei has pale skin and is 4'8".

Rei is an emotionless, quiet, and stoic girl. Rei usually will remain quiet, unless talked to. Rei eyes are usually half-lidded and she seems to have no emotions at all, her voice is calm. Rei doesn't smile, her face is always blank and expressionless, but if she does smile, it means she truly cares for you.