Lefi (Leficios) is a main character in Maou ni Natta node, Dungeon Tsukutte Jingai Musume to Honobono suru. Lefi is an "Ancient Dragon" with the title of "Supreme Dragon', with many subordinate dragons. She first appears outside of Yuki's dungeon in her dragon form. Initially, she was hostile upon their first meeting however Yuki charms her with chocolate and other such sweets and turns her into an enemy to a companion. Lefi in her dragon form she is described as being a large majestic dragon with silver scales. Lefi in her human form appears at the age of 13 to 14-years old, and described with a flawless, slender body with platinum silver hair, along with her eyes being silver.

Spoiler

Later becomes Yuki's first official wife.