Quetzalcoatl

Hair Color: Blonde
Eye Color: Blue (left), green (right)
Relatives: Unnamed sister
Faction: Spectation

Quetzalcoatl often referred to as Lucoa, is a former dragon goddess and an old friend of Tohru. She was exiled from her seat after consuming cursed liquor that led her into a scandalous affair. As a member of the spectating faction, she does not interfere with any events involving the dragons or gods. She's by far the most powerful dragon in the series.

In her human form, Quetzalcoatl is a tall, fair-skinned, and hour-glass woman with enormously large breasts. She has long, wavy blonde hair, in the anime her hair takes on 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. In the manga, she takes the appearance of a large amphithere dragon with broad feathered wings and a mask-like skull. In the anime, she takes the appearance of a feathered serpent.

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 shorts, 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 for those around her. Kobayashi even comments that her outfit "does not leave much to the imagination."

Quetzalcoatl appears to be laid-back and carefree who is rarely seen without a smile. She is wise, kind, and nurturing who often has advice for her younger kin. As a former goddess, she is better tuned to human customs, as seen when she explains to Tohru why Kobayashi was not receptive to Tohru's initial cleaning regimen. Despite this, however, Lucoa seems to lack some sense of dignity severely. She is not above using her body as a means of getting what she wants, shown when she attempts to use her alluring figure as an offering to Shouta, hoping to allow her to stay in his home.

Quetzalcoatl lives with Shouta but does not work for her stay. The two have a complicated relationship as Shouta sees Quetzalcoatl as a succubus or demon rather than a dragon. Quetzalcoatl will often try to get Shouta's attention, but due to her massive breasts, she often ends up flustering and embarrassing him instead.

(Source: Miss Kobayashi's Dragon Maid Wiki, edited)