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 gather together at the Dimensional Infinity Fortress, Muzan appears before them in his female form. He regards them with annoyance and tells them to lower their heads and squat in front of him. After they all do so, Mukago utters that he's sorry to have been ordered to do so, since he didn’t recognise Muzan in that form, to which Muzan angrily asks why he's speaking without permission, telling him to silence himself and not to talk unless directly asked a question. As she cowers in fear at his feet, Muzan goes on to explain the death of Rui, the only Lower Moon who isn't amongst the ones gathered before him, and asks the remaining Demons why they're so weak.

He lectures them about how them being in the ranks of the Twelve Demon Moons isn’t the end, only the beginning of what's to come, and that their sole purpose is to consume blood so they can be of use to him. Muzan says that it's been hundreds of years since the Upper Moons were last replaced, yet the Lower Moons are replaced all the time, to which Kamanue thinks to himself that Muzan can’t just tell them that. Since he can read the minds of those he has shared blood with, Muzan angrily asks 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 attempts to apologize, but is promptly eaten by Muzan as Mukago and the rest of the Lower Moons keep their heads lowered in a shocked silence.

Next, Wakuraba thinks to himself that he's also going to be killed, so he needs to do more in order to keep his position as a Lower Moon, and, at the same time, Mukago thinks about how he runs every time from the very mention of a Pillar. Muzan repeats aloud both of their thoughts, and a terrified Mukago exclaims that that isn’t true and that he would fight with his life in the line for him. Muzan asks him if he is denying what the demon lord was saying, and, as Mukago begins to cry, another bout of Muzan's tentacles crushes him into the ground, killing him.

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 were revealed in the first fanbook.

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Мукаго