Marquis

Zolgear was a demon who lived in the Demon Realm and one of the antagonists of the series. He is the father and creator of Zest, his former servant who had worked for him until he abandoned her due to her inner desires and jealousy toward Mio and Yuki. Zolgear is later revealed to be a member of the Cardinal Sins among the Demon Lord Faction in Volume V, him being Lust and the lowest-ranked member. Like most in the Demon Council, Zolgear is ambitious and ruthless even desiring to overthrow the Demon Lord, Leohart replacing him as the ruler of the Demon Realm. He also has no issues with killing people as he murdered both the foster parents of Mio Naruse who had been in charge of her right in front of her eyes, as well as being willing to use anything and anyone to get his way like using Maria's mother as a hostage to force her to bring Mio to him to save her. Befitting his ranking as Lust, Zolgear has a desire for both power and women, as he desired both Mio, as well as the power that she had inherited from her father. He also desired to even take Yuki for himself after her attempt to rescue Mio. Zolgear is also a sadist as he desires to force several female demons into master-servant pacts using the curse of the succubus to hurt them.