Android 21 was described as a tall, curvaceous woman with glasses, long bushy auburn hair and blue eyes. She had a gold ring on her left middle finger, and black nails. She wore 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 ankle heel boots with gold tips. She also usually wore a white lab coat with her outfit. She stands at 6'0" (180 cm).