ケイ

Based on Sir Kay, who is Sir Ector's son and King Arthur's foster brother and later seneschal, as well as one of the first Knights of the Round Table in the Arthurian legend.
One of the Knights of the Round Table. A maid who used to act polite but then showed her true colors; she is a merciless sadist who loves teasing people. Not only can Kay handle the household chores, she can also fight like a proper knight.