Big Sister Maid is the older sister who is a former slave. Maoyuu's head maid take her and her young sister to be the new maids.
Big Sister Maid is originally created by Mamare Touno and illustrated by Keinojou Mizutama & toi8 for the Maoyu light novel series. There is no current information regarding any inspirations used to create this character. She is illustrated by Hiro Touge in Maoyū Maō Yūsha: Oka no Mukō e manga series, by Akira Ishida in Maoyū Maō Yūsha: "Kono Watashi no Mono to Nare, Yūsha yo" "Kotowaru!" manga series, and by Hiroaki Karasu & Masashi Kudo in the anime series. She first appears in episode 2.
She is voiced by Haruka Tomatsu.