Lilith is a Devil who appeared in chapter 21 and episode 10 in anime.

Lilith appears as a young prepubescent girl with dark mocha skin and blue hair. Her iris color is green with black sclera. Her teeth are noticeably pointed like Rachnera's. As a devil, Lilith also has Bat-like wings and two black curved horns that face forward along with a stereotypical spadetail.

Her attire consists of a black and white hooded jacket with a grinning devil on her left breasts, hot pants, thigh high socks and sneakers. Her jacket has zippers on the back to allow her wings to be extended

(Source: Monster Musume Wikia)