Mukago

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

Appearance
Mukago was a small boy with sickly yellowish skin, two dark red stripes across his cheeks, and a pair of white horns protruding from either side of his forehead. His eyes were gray with white rings around the sides, their sclera dark red and the kanji for ‘Lower Moon Four’ carved over his left iris, and were framed by a set of notably long eyelashes. He also possessed chin-length white hair with shorter bangs between his 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 his thoughts, Mukago had no intention to battle the Demon Slaying Corps' Pillars and planned to run away and flee at the mere whisper of a Pillar, having been noted to have done so numerous times. When Muzan learned of this by reading his mind, Mukago attempted to appease him and beg for mercy.

Functional Recovery Training Arc
After all of the remaining Lower Moons had gathered together at the Dimensional Infinity Fortress, 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 he was sorry to have to have been ordered to do so, since he didn’t recognise Muzan in that form, to which he angrily asked why he was speaking without permission, telling him to silence himself and not to talk unless he was directly asked a question. As he 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 said 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 he 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 he would fight with his life on the line for him. Muzan asked him if he was denying what he was saying, and, as he began to cry in hysterical panic, another bout of Muzan's tentacles crushed him into the ground and devoured his corpse.

Demon Abilities
Little is known about Mukago's strength and abilities as a Demon, but it's assumed that he must have been much stronger than an average Demon and superior in power to both Rui and Kamanue, as he was given a higher Lower Moon position than them.

Trivia

 * His name and gender was revealed in the first fanbook.

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Мукаго