In her human form, Quetzalcoatl is a tall, fair-skinned woman with an hourglass

In her human form, Quetzalcoatl is a tall, fair-skinned woman with an hourglass figure and large breasts. She has long, wavy blonde hair, in the anime her hair takes on a turquoise and green color at the ends. She has heterochromia, where one iris has a different coloration from the other. Her left eye is navy blue on the outside and yellow on the inside, with a green, slit pupil. Her right eye is green on the outside with designs and black on the inside with a yellow, slit pupil. Although she tends to keep her eyes closed most of the time. Like Tohru, Quetzalcoatl keeps her horns but does not retain her tail, or decides to keep it hidden. When she first arrives at Kobayashi's home, she dons a pink cap, a choker, and necklace (only in the manga), a black tank top that exposes her cleavage and stomach (covers her stomach in the anime), jean booty-shorts that reveal a generous portion of her buttocks (in anime), thigh-high black stockings, and pink shoes. She does not wear a bra, which allows her voluminous breasts to jiggle and bounce without much restraint with every movement she makes, creating a distracting environment to those around her, especially males. However, this seemed to be advantageous as it helped a young boy named Shouta Magatsuchi win a relay race as many of the other male runners were distracted by her breasts bouncing. Kobayashi even comments that her outfit "does not leave much to the imagination."