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She was voiced by Kana Ueda in Japanese, and by Kira Buckland in English. The latter also played Malva in Pokemon X and Y, Kirumi Tojo in Danganronpa V3, Marie in Skullgirls, Mimet in Sailor Moon S, and Maimu Okurahama in Kill la Kill.
Mukago's past life is unknown, besides she was turned into a demon by Muzan, and had been eating humans afterwards. During the meeting in Infinity Castle, Muzan appears before them and make them kneel. Mukago utters she's sorry to have been ordered to bow, which causes Muzan to says that she don't permission to talk. The demon lord lectured about Rui's death and it has been over a century since the Upper Moons were last replaced, with Lower Moons replaced all the time.
Another demon, Kamanue thinks he can't just tell him that, Muzan reads his mind and angrily asks him why, before killing him. At this point, Mukago is extremely nervous, and start thinking about how she runs away every time from a Hashira. Muzan asks if they fear the Demon Slayers more than him, to which the terrified Mukago denies it. As Muzan asks if she is denying what he said, Mukago starting to cry and try to apologize, before being killed by her master.
Despite being a demon, Mukago is truly a coward at heart, as she had no intention of fighting the Demon Slayers, which makes Muzan to view her as useless.