Mukago

Mukago was a member of the Twelve Demon Moons, having held the position of Lower Moon Four.

Appearance
Mukago was a small girl with sickly yellowish skin, two dark red stripes across her cheeks, and a pair of white horns protruding from either side of her forehead. Her eyes were gray with white rings around the sides, their sclera dark red and the kanji for ‘Lower Moon Four’ carved over her left iris, and were framed by a set of notably long eyelashes. She also possessed chin-length white hair with shorter bangs between her horns.

Mukago wore a plain red kimono, the collar lined with black and white fur, tied up at the back with a large dark purple bow.

Personality
Out of all the Lower Moons, Mukago was shown to be the most cowardly, as stated by Muzan Kibutsuji by reading her thoughts, Mukago had no intention to battle the Demon Slaying Corps' Pillars and planned to run away and flee at the merest whisper of a Pillar, having been noted to have done so numerous times. When Muzan learned of this by reading her mind, Mukago attempted to appease him and beg for mercy.

Functional Recovery Training Arc
After all of the remaining Lower Moons had gathered together, Muzan appeared before them in his female form. He regarded them with annoyance and told them to lower their heads and squat in front of him. After doing so, Mukago uttered that she was sorry to have to have been ordered to do so, since she didn’t recognise Muzan in that form, to which he angrily asked why she was speaking without permission, telling her to silence herself and not to talk unless she was directly asked a question. As she cowered in fear at his feet, Muzan went on to explain the death of Rui, the only Lower Moon who wasn’t amongst the ones gathered before him, and asked the remaining Demons why they were so weak.

He lectured them about how them being in the ranks of the Twelve Demon Moons wasn’t the end, only the beginning of what was to come, and that their sole purpose was to consume blood so they could be of use to him. Muzan says that it had been hundreds of years since the Upper Moons had been replaced, yet the Lower Moons were replaced all the time, to which Kamanue thought to himself that Muzan couldn’t just tell them that. Since he could read the minds of those he has shared blood with, Muzan angrily asked Kamanue why they couldn’t be told that, expanding and extending his arm into a tentacle to grab the Lower Moon by his neck and lift him into the air. Kamanue attempted to apologize, but was promptly eaten by Muzan as Mukago and the rest of the Lower Moons kept their heads lowered in a shocked silence.

Next, Wakuraba thought to himself that he was going to be killed, so he needed to do more in order to keep his position as a Lower Moon at the same time Mukago thought about how she ran every time from the very mention of a Pillar. Muzan repeated both of their thoughts, and a terrified Mukago exclaimed that that wasn’t true and that she would fight with her life in the line for him. Muzan asked her if she was denying what he was saying, and, as she began to cry, another bout of Muzan's tentacles crushed her into the ground.

Demon Abilities
Little is known about Mukago's strength and abilities as a Demon, but it’s assumed that she must have been one of the more strong Demons to have made it all the way up to the position of Lower Moon Four.

Trivia

 * Her name was revealed in the first fanbook.

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Мукаго