Quetzalcoatl

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.

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, as 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)