Android 21 is described as a tall, curvaceous scientist with glasses and long bushy auburn hair. She has a gold ring on her left middle finger, and black nails. She wears a pair of hoop earrings, a sleeveless, short blue and red checker pattern high-neck minidress with opaque black tights, matching black detached arm sleeves, and blue (left foot) and red (right foot) ankle heel boots with gold tips. She also usually wears a white lab coat with her outfit. Her eyes are similar to that of Dr. Gero