The upper moons

Muzan
Demon King
height:179.
Chronological age: +10,000 years
Physical age: 20 years
race: demon
skin color: pale skin
hair color: medium wavy black
Eyes: It has piercing red eyes with pupils like a cat's.
gender: male
Personality: Cold, calculating, strong, powerful, the strongest and oldest demon, very narcissistic, merciless, cruel, manipulative, extremely manipulative and controlling. He does not hesitate to kill someone who disrespects him in the slightest way. Often very serious and calm. He hates Douma because he considers Douma arrogant, although he does not kill him because he is very useful to him. As a demon, he does not feel lascivious or lustful desires.
What he thinks of each of the upper Moons:
Kokushibo: He sees him as his right-hand man and partner, one of his favorites
Douma: He finds him quite annoying and irritating, but he doesn't hate him, although he is bothered by how arrogant he is.
Akaza: He's one of his favorites. He likes his way of thinking and how he always acts so serious during his missions. He likes his maturity.

Kokushibo
Upper Moon 1
Altitude: 190 meters
Chronological age: 480 years
physical age: 28-30 years
race: demon
skin color: pale skin
Hair color: red, long, often tied back in a ponytail, leaving two loose strands framing her face
Eyes: It has six golden eyes in the center, the rest red.
gender: male
Personality: Cold, calculating, serious, merciless, extremely strict, he is Muzan's right-hand man, reserved, quiet, strong, quite serious with other people and even more so if they are children, as he is a demon he does not feel lascivious or lustful desires.
What she thinks of the other Upper Moons
From Muzan: He has great respect for him and is often like his right-hand man, being more of a second leader of the Upper Moons.
Regarding Akaza: He has a certain respect for him because of how serious he is, and he also likes that he takes his missions and work seriously.
Douma: He thinks he's incompetent and annoying, even that he might one day betray Muzan and the Upper Moons. He has told Muzan several times to have him killed.

Douma
upper moon 2
height: 187
Chronological age: 133 years
Physical age: 19 years
race: demon
skin color: cream skin
Hair color: long, blonde, down to the back, often messy
Eyes: Multicolored eyes in pastel shades (pink, green, yellow and blue)
gender: male
Personality: A bit playful, mocking, clumsy, stupid, arrogant, he cannot feel emotions like love, affection or happiness so he only fakes his emotions, strong, he loves to eat young and beautiful women as they give him more power, he likes to annoy and mock Akaza, sociopath, psychopath, sadist, masochist and manipulator, his way of manipulating people is through charming and kind words and actions, he often pretends to be someone kind and fun, as he is a demon he does not feel lascivious or lustful desires.
What he thinks of each of the Upper Moons
Muzan: He thinks he's like a god and is fascinated by his power, although he didn't exactly respect him.
Kokushibo: He respects him for being the strongest after Muzan; sometimes he teases him a little, but not always because he is too serious for him.
Akaza: He sees him as his friend, loves to tease him for fun and make him angry, reminding him that he took his position as Second Upper Moon from him.

Akaza
Upper Moon 3
height: 173 meters
Chronological age: 200 years
Physical age: 20 years
race: demon
skin color: pale with blue stripes on the skin
Hair color: short pink
Eyes: It has a yellow iris and the rest is blue
gender: male
Personality: Reserved, serious, strong, hates weak people, hates Douma for eating women, respects women and children, would never dare to devour any woman or child out of respect, greatly respects Muzan, quiet, sometimes kind, hates Douma, very respectful of women and even more so if they are little girls, as she is a demon she does not feel lascivious or lustful desires.
What she thinks of the other Upper Moons
Muzan: He respects him a lot since he is his boss and leader, and he always obeys all of his orders.
Kokushibo: He has a deep respect for him and hopes to one day defeat him and take his place
Douma: He finds him annoying and hates him quite a lot, he even sometimes fought with him out of pure hatred, he hates him because he had taken away his position as Second Upper Moon.

They are in the Taisho era (1912-1926) in Japan. Demons do not have human desires, so they cannot feel any kind of lust or lascivious desire.
Each Demon has an instant regenerative power; they don't feel much pain or emotions.