Zest

Zest is a Demon who lives in the Demon World.

[Spoiler] It is later shown that she was a magical organism created by Zolgia, yet she was often envious of Basara with Yuki and Mio. She later joins Basara's group as the fifth female and third demon girl following Zolgear's defeat and her defection to the Moderate faction. [/Spoiler]