Zest B. Steward

Zest B. Steward is a Demon that was created by and served Zolgear as his maid, she was sent by the Demon Lord Faction to serve as a scout alongside Lars. After the defeat of Zolgear, she temporarily served Sheila, the mother of Lucia and Maria having lost her original purpose and complied with the demands of the Moderate Faction. She ultimately serves Basara as she is tied to him in the Master-Servant Contract in a manner similar to Mio and Yuki but instead uses Sheila's nature. Zest is known to be fiercely loyal to her master. Cold and calculating, she never goes against her master's wishes. She, however, does not practice blind obedience and would advise her master should she feel that her master's decisions would result in undesirable consequences. This trait was exemplified when she advised Zolgear to refrain from raping Mio Naruse before her powers are completely extracted, as this will result in the loss of her powers which was essential if Zolgear were to overthrow the current Demon Lord Leohart. Her previous life makes her quite naive in morals, save for the servitude she was taught by Zolgear. This also quite often puts her in the crosshairs of Maria's succubus antics. Cold as she is, it doesn't mean that she doesn't have the capacity to have and feel emotions. This was first implied when she scouted the Toujou Residence during Basara's subjugation of Mio and Yuki Nonaka, wondering if Zolgear would love her as Basara would to his servants, or what if Basara were her master instead, although she asserted that she felt "no jealousy whatsoever". Her emotions became even clearer as she served Sheila, and later, Basara. It appears that she has a complex and constantly wonders whether she is useful enough to her master. She is also revealed to have a humble and meek personality when she is not fighting her master's enemies and is the only one amongst those bounded by the Master-Servant Contract to address Basara with the suffix "-sama".