She often goes by Lucoa.
- Gainaxing: Played For Laughs on the anime, where her breasts jiggling creates a "boing" song.
- Mismatched Eyes: Her left eye is black 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.
- Ms. Fanservice: Lucoa is fanservice incarnated. Almost every time she's on focus fan service is happening and all her outfits are kind of fanservicey.
- Who Wears Short Shorts: In her debut she was wearing these.
- Zettai Ryouiki: Usually she wears rank B.
The title character and protagonist, a dragon that decided to become a maid for a japanese woman that lives in the 2010s.
- Fantastic Racism: Despite loving Kobayashi and not being particularly harsh towards another humans, she has practically a verbal tic on her tongue making her call them "pathetic" and "weak".
- Fish Out of Water: She isn't completely ignorant of human habits since humans exist on her world, but she never tried to actually live with them until she met Kobayashi, and that creates a lot of problems.
- Hellish Pupils: They're red, indicating her status as a chaos dragon.
- Super Speed: Can both fly and run in incredible speeds.
- Super Strength: Retains her physical strength as dragon in human form, resulting in incredible devastation to her targets.
The other title character. A common japanese woman, she meets Tohru while drunk and says she can live at her house. Despite not remembering well what she did, she lets Tooru stay, feeling guilty knowing that the female dragon has nowhere to go.
- A-Cup Angst: She often feels envy of Tohru's breasts.
- Can't Hold Her Liquor: Gets quickly drunk and soon is doing things she usually don't would do in her normal state...like stripping Tohru down to her panties.
- Fiery Redhead: Averted when she's sober, but she becomes really unhinged when she's drunk.
- Back to Miss Kobayashi's Dragon Maid