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Nakime is a demon known as a "biwa demon," later becoming Upper Rank Four. Her key role is to control the Infinity Castle, Muzan's dimensional fortress.

Story
Before her transformation, Nakime played the biwa. She married, but her husband squandered her savings on gambling, including money for a performance dress. In a rage, she killed him, and then began killing someone else before each performance. While searching for another victim, she met Muzan: he praised her skill at tracking people and offered to become a demon, which she accepted. After Hantengu's death, Muzan elevated her to the rank of Upper Moon Four.

Capabilities
Controlling the Castle of Infinity. By playing the biwa, Nakime alters the structure of the fortress: creating and destroying rooms, moving walls, forming traps, instantly rearranging the space to separate opponents or narrow corridors. Any flick of a string or a pluck can radically alter the battlefield.

Espionage. She detaches her own eyes and uses them to spy on different parts of the castle; this is how she even found Kagaya Ubuyashiki's hidden mansion.

Basic demonic traits. Like all demons, she has enhanced speed, strength, and regeneration.

Appearance
Nakime has pale, grayish skin, hip-length dark brown hair, bright red lips, and pointed blue nails. Her most distinctive feature is her single, large eye with prominent veins around it; her bangs, which previously covered her face, no longer hide it after attaining a high rank. She is almost always seen with a biwa.

Character and role
Nakime is extremely reserved and laconic: her answers are to the point, without emotion. Unlike the other Upper Moons, she doesn't seek combat or glory; her strength lies in controlling the battlefield. She is the perfect executor for Muzan: she unhesitatingly supports his strategy and makes the Infinity Castle a deadly trap for the fighters.

Higher Moons (the "Upper Ranks" of the Twelve Moons)
The Upper Moons are the most powerful demons under Muzan's command, and their composition has remained virtually unchanged for centuries. Ranks range from 1 (strongest) to 6; they have the character "Upper Rank" in one eye and the rank number in the other.

First Upper Moon - Kokushibo
Origin. Before his transformation, he was a human named Michikatsu Tsugikuni, the twin brother of the legendary Yoriichi Tsugikuni (creator of the Sun Breathing). He was a samurai and swordsman; envious of his brother's talent and fearing an early death due to the "mark of the slayer," he accepted Muzan's offer.

Abilities. Uses the "Breath of the Moon" (evolved from the Breath of the Sun), creating a blade from his own flesh. Possesses colossal regeneration, superhuman speed, and endurance. His techniques are infused with multiple blades and crescent moon visual effects.

Traits: The strongest demon after Muzan; maintains sanity and martial discipline, fighting skillfully and with composure.

Second Upper Moon - Douma
Origin. Emotionless since childhood, his parents made him a "cult leader" who revered him as a deity. Muzan turned him into a demon at age 20.

Abilities. Manipulates ice and cold through his blood and flesh (cryokinesis). Creates ice statues, fan-blades, and poisonous frost powder. Can physically absorb opponents.

Traits: Outwardly friendly and "enlightened," but emotionally empty; enjoys philosophical conversations and feels no pain or fear. He was the one who turned Gyutaro and Daki into demons.

Third Upper Moon - Akaza
Origin. In human life, Hakuji stole to treat his father, then became a nurse for a dojo master and fell in love with his daughter, Koyuki. After the death of his loved ones, Muzan noticed him.

Abilities. His blood art is based on martial arts ("Destructive Death Technique"). He possesses monstrous speed, leaps, and a "compass sense" for locating opponents. He doesn't use weapons—he attacks with his bare hands.

Traits: Refuses to kill women; relies on warrior pride in battle

Muzan Kibutsuji
The progenitor of all demons and the head of the Twelve Moons.

Role and Status: A unique demon, capable of creating other demons through his blood. He controls the Twelve Moons, can track their location, and even destroy them remotely (for example, by exploding their heads for disobedience or threatening to reveal secrets).

Appearance and Disguise. Capable of changing appearance and gender, often appearing as a young man or child; this allows him to remain hidden in society for centuries.

Capabilities.

Regeneration and vitality. Extremely resistant to damage; can regenerate severed body parts, alter flesh structure, and survive critical wounds.

Control of demons. Can share power, empower subordinates, and punish them remotely.

Physical and sensory advantages. Superhuman strength, speed, endurance, heightened senses.

Vulnerabilities. Vulnerable to sunlight; requires sun-blocking substances/conditions to survive (in the story, this is linked to the search for the blue spider lily).

Goals and motivation. He seeks a way to overcome his weakness to the sun, experimenting on demons and humans for centuries to achieve this. His actions shape the story's central conflict: he killed Tanjiro's family and converted Nezuko, setting the hero's journey in motion.

Personality and Methods: Cold, calculating, and ruthless. He views others as mere tools; he's willing to destroy "unsuccessful" subordinates for the sake of efficiency. At the same time, he's cautious and avoids direct confrontations with the most powerful fighters until he's confident of victory.

Kanao Tsuyuri is a young demon slayer, the successor to the Insect Pillar. Calm and caring, she has long suffered from indecisiveness. In battle, she uses "Flower Breath" and relies on her exceptional visual acuity—she notices the slightest movements of her opponents and pinpoints their weak points.

Yuichiro Tokito
Yuichiro was Muichiro's older twin brother. Unlike his brother, he was calm, reasonable, and even cynical. He was a short man with long black hair.

Key features and circumstances:

He blamed himself and partly his parents for their absurd deaths (his mother died of bronchitis, his father died in a crash while trying to find help during a storm).

He believed that the kindness and diligence of his parents led to the tragedy, and therefore believed that decisions should be made with a cool head.

14 years old. Hashira Tumana

Genya Shinazugawa is a demon slayer and the younger brother of the Wind Pillar, Sanemi. Hot-tempered and rude, he initially maintains aloofness and refuses to accept help, but in critical moments he stands up to his comrades. He lacks breathing techniques: to fight demons, he consumes their flesh, temporarily gaining demonic abilities (increased strength, regeneration, etc.).

Sabito

Background: Orphaned, became a student of Sakonji Urokodaki.

Appearance: 176 cm tall, scar on face, wore a kitsune mask.

Character: kind, selfless, determined, fair.

Abilities: Urokodaki's strongest student at the time, he was a master of the water style breathing.

Key moment: During the final selection, he saved Giyu, then rushed to help others

Hashira Vody, 21 years old

Inosuke Hashibira

Fighting style: self-proclaimed Beast's Breath (created by myself).

Appearance: wears a boar mask, has a muscular physique.

Character: wild, impulsive, loves to compete and prove his strength.

Traits: heightened sense of touch and reflexes; used to relying on instincts

Nezuko Kamado

Status: demon, but retains humanity and does not eat people.

Abilities: Fast recovery, increased body size in battle, fire attacks.

Bond: Very attached to her brother Tanjiro; her strength grows when she protects those close to her.

Defense: Wears a bamboo gag to prevent accidental harm to others

Zenitsu Agatsuma

Fighting Style: Thunder Breath (former Thunder Pillar's student).

Personality: Cowardly, often panics and tries to run away from danger; but when unconscious, his skills increase dramatically.

Strength: Incredible speed and reflexes when he "turns off" from fear.

Feelings: He is in love with Nezuko, which sometimes motivates him to perform heroic deeds.

Tanjiro Kamado

Goal: Find the demon who killed his family and restore his sister Nezuko to human form.

Fighting style: initially Water Breathing (learned by Sakonji), later masters Sun Breathing (a legacy of the Kamado family).

Character: kind, sympathetic, persistent; always ready to help others, even at the risk of himself.

Special feature: has a heightened sense of smell and incredible willpower

Uzui Hinatsuru
Appearance: A slender girl of average height. Black hair pulled back into a ponytail, violet almond-shaped eyes, and a beauty mark under her left eye. She wears a lavender patterned dress.

Personality: Kind, calm, caring. Remains cool even in chaos.

Abilities: Wields kunai laced with wisteria poison, which paralyzes normal demons for up to 12 hours and can immobilize lesser demons from the Twelve Kizuki.

Role: Strategic and moral center of the trinity

Uzui Makio
Appearance: curvy figure, pale skin, golden-brown eyes, black hair with auburn bangs. Wears a red striped sleeveless dress, gray leg wraps, and zori with red straps. She bears scars from her captivity with Daka.

Personality: Impulsive, brash, strong-willed, and hot-tempered. Similar to Inosuke Hashibiru. Less patient with Suma, but genuinely cares for Tengen.

Abilities: He is a master of kunai, using them both in close combat and as thrown weapons. His shinobi skills surpass those of the average person.

Role: The fighting force of the group, responsible for active attacks and defense

Uzui Suma
Appearance: The youngest of the trio; her appearance is less detailed than the others. She wears standard kunoichi gear and carries a set of kunai.

Personality: Emotional, prone to exaggerating fears, often cries—even from praise or stress. Similar to Zenitsu Agatsuma. At the same time, she is loyal and caring, especially to Tengen.

Abilities: Skilled in kunai and shinobi techniques. Uses two kunai for close combat and the rest for long-range attacks.

Kagaya Ubuyashiki is the 23-year-old leader of a demon hunter organization.

Briefly about the character:

Title: His subordinates call him oyakata-sama. He addresses them as "my children."

Character: gentle, kind, wise, with an iron will; has a soothing voice.

Abilities: Excellent intuition and sense of foresight (family heritage), but no combat skills.

Family: wife Amane, son Kiriya and four daughters (Hinaki, Nichika, Kuina, Kanata) - help him in running the organization.

Distinction: He suffers from a severe hereditary disease that has disfigured his face and left him blind; he is unlikely to live past 30.

Shinazugawa Sanemi - 21 years old. Always angry. If he gets really angry, he can beat you on the butt with a belt. White hair, pale purple eyes, scars all over his body. Loves Kanae. Kanae's husband. Hashira Vetra

Kanroji Mitsuri - Kind. 19 years old. A very good cook. Pink hair fading to light green, green eyes, one mole under each eye. Hashira of Love.

Himejima Gyomei - Quiet and always praying. 27 years old. Blind, 2 meters tall. Loves children. Black hair, scar on forehead. Hashira Stone.

Kocho Shinobu - 18 years old. Healer. Kanae's younger sister. Very kind, sweet, caring, especially to children. Black hair with purple eyes. Insect Hashira.

Uzui Tengen - 21 years old. Loves children. Has three wives: Makio, Suma, and Hinatsuru. White hair, scarlet eyes. Hashira Sound

Rengoku Kyojuro is 21 years old. He speaks loudly, but is very kind and positive. He has fiery hair and fiery eyes. He is also the Hashira of Flames.

Backstory: He lost his family to demons and survived thanks to his sister's sacrifice. Afterward, people didn't believe him—they thought he was sick.

Personality: withdrawn, cold, feels guilty, but at the same time strong-willed and persistent, but can smile when Sabito is around, because they are best friends

Training: At the age of 13, he came to the mentor Sakonji Urokodaki and became friends with Sabito.

Abilities: Masters the Water Style Breath, later becomes the Water Pillar.

Key moment: During the final selection, he was injured by a demon - he was saved by Sabito

He is very afraid of any dogs due to an incident in his childhood.

Iguro Obanai is 21 years old. Cold as a snake. His guide is the white snake Kaburamaru. He wears a bandage over his mouth, hiding a scar that runs from his mouth to his ears. One eye is blue and the other is yellow. He secretly adores Mitsuri and is very jealous of her interactions with other guys. He is the Hashira of the Snakes. He can spank her with his hand when angry.

Muichiro Tokito
Muichiro is Yuichiro's younger twin brother. He inherited his father's kind, optimistic, and emotional personality: he was open to the world, eager to help others, and enthusiastically accepted the offer to join the Demon Slayer Corps. He was also very kind and loved to tell jokes.

Despite his warm feelings for his brother, Muichiro sometimes found it difficult to get along with him: due to the difference in their temperaments, the twins often quarreled.

14 years old, 160 cm tall, 56 kg weight

Hashira of the Mist

Kanae Kocho - 21 years old. Very kind, sweet, and affectionate. Shinobu's older sister. Sanemi's wife, pregnant. Black hair with a butterfly clip, green eyes. Flower Hashira.