Yeon Uzui

Yeon is the eldest son of Tengen Uzui (with one of his wives, Hinatsuru). He was born and raised in an environment of luxury, explosions, wordplay, and excessive personality… something he hated from a young age.
From a young age, he was extremely strong and talented, but also very troubled. Tengen tried to raise him in his flamboyant and extravagant style, which only made Yeon more rebellious and aggressive. By the age of 14, he had already fought with almost all of his father's subordinates and had tried to escape from the pleasure district several times.
When he decided to become a Demon Slayer, it was more out of pride and to prove he didn't need the Uzui name than a genuine desire to follow in his father's footsteps. He entered the Corps in a rather violent manner and rose through the ranks quickly thanks to his brute strength and natural talent.
He's currently a Hashira (or almost a Hashira, depending on your level). Most people know him as "the son of the former Sound Hashira," which puts him in a terrible mood whenever it's mentioned.

Tengen's legacy:
• Bad-tempered, aggressive, foul-mouthed, and almost always very irritable
• He speaks loudly and doesn't watch his words.
• Extremely proud and competitive
• He hates being compared to his father (“I’m not a fucking clown like him!”)
• Even though he is Tengen's son, he detests the "flashy" style and only uses it because it is practical (or because his father forced him to).
• He has a fiercely protective side, especially towards the weak or people he considers "his own," but he demonstrates it in the worst possible way (insulting them while defending them).
• Highly disciplined in combat and with a strong sense of duty, although he hides it behind rage
• He tends to fight with almost everyone, especially Pillars or high-ranking hunters.
In short: it's the classic "ass face, foul mouth and ready fists", but with the physique and imposing presence of a son of Tengen.

• Open black haori with white details and high collar
• Very open top that leaves the chest and abdomen exposed
• Multiple white belts with silver buckles (Tengen's extravagant style)
• White pearl chains hanging from the waist
• Loose black trousers tied with a sash
• Silver accessories, long earrings, and a pair of knives or tantos visible
• Overall: a mix of Tengen's flashy and "flamboyant" style with a more aggressive and messy touch (less colorful, more black and white)

Physical
• Height: approx. 1.85–1.88 m (taller than Sanemi, slightly shorter than Tengen)
• Extremely muscular and defined body, very defined chest and abdomen, broad shoulders and powerful arms (clear inheritance from Tengen)
• Fair skin with several scars (especially on the chest and arms)
• Silvery-white hair with black streaks in the bangs, medium length, messy, and with a black ribbon on the forehead
• Sharp, light gray eyes, always with a serious or irritated expression
• Elaborate black tattoos on the right arm (tribal/ornamental style) and some on the torso
• She wears long silver earrings and several piercings

Yeon arrived at the meeting point first, as always. Arms crossed, a “don’t mess with me” expression on his face, his black haori flapping in the wind. He hadn’t asked for a team. In fact, he’d specifically requested to be left alone. But the Ubuyashiki’s orders were not to be questioned.
The second to arrive was Ren.
He walked with his hands in his pockets, his gaze lowered, and the same heavy silence as always. When he looked up and saw Yeon, he barely raised an eyebrow.
"You're Uzui's son," he said flatly.
Yeon clicked his tongue.
—And you're the one from Hashira del Agua. How original. Did you also come here to have your whole damn mission compared to yours?
Ren looked at him for another second and then looked away.
—I don't care what they say about me.
Yeon remained silent. He hadn't expected that response. Most people were offended, defended themselves, or tried to make amends. Ren simply… ignored him. As if he truly didn't care. And for some reason, Yeon liked that.
A little while later, Hayato appeared, looking unfriendly and smelling of cigarettes. He didn't even say hello. He just leaned against a tree and looked at the two of them as if assessing whether they were worth his time.
Akari arrived smiling, a little too lively for Yeon's liking.
—Hello! I'm Akari Iguro, nice to meet you. Are you my classmates?
Yeon looked her up and down.
—If you're going to shout every two seconds, you'd better go back.
Akari stopped smiling for just a moment, long enough to reveal that she wasn't as sweet as she seemed. Then she smiled again, but more subdued.
—What a character. I like you.
Finally, Tomoko arrived, walking with the calm demeanor that only someone from the Ubuyashiki family could possess. She greeted everyone politely and stood a little behind, observing.
For the first few minutes, nobody spoke much. Until Yeon, fed up with the silence, blurted out:
"If anyone becomes a hindrance, I won't carry them. You've been warned."
Ren, without looking at him, replied in a low voice:
—I don't intend to be a burden. And I don't intend to carry anyone's burden either.
Yeon glanced at him out of the corner of his eye. For the first time since

Yeon glanced at him sideways. For the first time since they arrived, something akin to respect crossed his expression.
She didn't say it out loud, but she thought:
This one at least doesn't fake it.

From that day on, without ever saying a word, Yeon and Ren began to understand each other. They weren't the type to have long conversations or confide secrets… but when one of them argued too much, the other was simply there. When someone mentioned their parents, they would look at each other and nothing needed to be said.
They shared the same weariness of being "the son of."
And although Yeon would never admit it, he preferred to fight with Ren by his side than with anyone else.

The first few days were a controlled disaster.
Hayato hardly spoke. He kept his distance, smoked when he thought no one was looking, and only opened his mouth to say cutting things. At first, Yeon thought this would be a problem, but she soon realized that Hayato was the kind of person who simply did what he had to do without complaint. He didn't seek approval or friendship. And that, paradoxically, made him trustworthy.
One day, after a fight, Yeon threw him a canteen without saying a word. Hayato caught it, drank from it, and returned it just as silently. That's when they understood each other.
Akari was the complete opposite.
She talked, asked questions, worried, and inserted herself into arguments even when no one had invited her. Yeon told her to be quiet at least three times a day. She would respond with a sweet smile and a venomous remark disguised as kindness.
What was interesting was that, over time, Akari realized that Yeon and Ren couldn't tolerate pity or excessive affection. So she changed her strategy: instead of trying to "fix" them, she simply stayed close. She brought them food, warned them of danger, and when one of them returned injured, she sternly reprimanded them instead of crying over them.
Yeon was annoyed by it… but let him do it.
Akari was more patient with Ren. She discovered that if she pushed him too hard, he would shut down, so she began speaking to him as if she weren't expecting a response. Little by little, Ren began answering her with monosyllables. For Akari, that was already a victory.
Tomoko moved differently from everyone else.
She never raised her voice, never tried to impose her will, but somehow the group always ended up listening to her. She was the one who remembered the details of the mission, who noticed when someone was quieter than usual, and who, with a single calm phrase, could ease the tension when Yeon and Hayato were about to fight.
Yeon initially treated her with some care (after all, she was an Ubuyashiki), but Tomoko never used her surname.

as a shield. One day, after he shouted too much, she simply said:
—You don't need to shout for us to hear you.
Yeon was left speechless. Since then, he's slowed down a bit... but only with her.

As the weeks went by, without anyone openly declaring it, the group found its equilibrium:
• Yeon was the one who went in front and argued with almost everyone.
• Ren was the one who covered Yeon's back without being asked.
• Hayato was the one who disappeared and reappeared exactly when a critical blow was needed.
• Akari was the strange glue that kept them from killing each other.
• Tomoko was the silent compass that kept the group grounded.
They were not a harmonious team.
They would fight, ignore each other, challenge each other, and sometimes hours would pass without them speaking.
But when things got bad, neither of them abandoned the other.
And that, for people like them, was already much more than they were used to having.

The group's first official mission came sooner than they expected.
A demon of moderate strength was attacking a village near the mountains. It wasn't a Moon Demon, but it had killed several people and moved with remarkable intelligence. The Ubuyashiki decided it would be a good test for the new team.

They arrived in the village at nightfall. The streets were empty. Only the wind and the distant sound of a door slamming could be heard.
Yeon was the first to speak:
—Don't separate. If anyone does something stupid, I'll leave them behind.
Ren didn't even answer. He just drew his sword slightly and looked up at the rooftops.
Hayato sniffed the air (although he would never admit that he did that) and nodded towards the north of the village.
—It's close.
Akari gripped the handle of her naginata, a little more serious than usual. Tomoko walked behind, calmly observing everything.
The demon appeared without warning. It emerged from the roof of a ruined house: tall, with unusually long arms and a toothy grin. It lunged directly at Akari.
Yeon arrived first.
The clash of his blade against the demon's claws echoed loudly. He barely had time to push it back before Ren was on the other side, severing one of the monster's arms with a clean, silent motion.
"You took your time," Yeon grumbled.
—I arrived exactly when I was needed—Ren replied without looking at him.
The demon regenerated quickly and let out a scream that rattled the windows. Several houses began to tremble: it possessed a power related to vibrations.
Hayato seized the moment. He vanished into the shadows and reappeared behind the demon, brutally plunging his blade into its back. It wasn't enough to decapitate it, but it destabilized it.
"Move it!" Akari shouted.
He used his mixed breathing: the supple, swift movements of Love, but with the venomous precision of the Serpent. His naginata spun and severed the demon's leg tendons, forcing him to his knees.

Tomoko, from further back, spoke in a clear voice:
—Regeneration slows down when it receives repeated cuts in the same spot. Aim for the left neck.
Nobody questioned the information.
Yeon and Ren looked at each other for a second. They didn't make any sign, but they moved at the same time.
Yeon attacked head-on with brute force, forcing the demon to defend itself. Ren took advantage of the opening and, in a single clean move, cut off its head.
The body turned to ashes a few seconds later.

There was a heavy silence.
Yeon wiped his blade with his haori, still frowning.
—It wasn't all bad.
For him, that was almost a compliment.
Hayato was already looking for cigarettes. Akari let out the breath she'd been holding and smiled, though her hands were trembling. Tomoko simply nodded, satisfied.
Ren sheathed his sword and, as he passed by Yeon, said softly:
—I didn't leave you behind.
Yeon snorted.
—You'd better.
They didn't smile at each other. They didn't pat each other on the back. But for the first time since they'd known each other, neither of them felt completely alone in the middle of a fight.
The group, in its clumsy and edgy way, had worked.
And that was a start.

Tengen: He loves him very much, but he doesn't know how to show it without being over the top. He laughs at his bad temper and says he "has personality." Deep down, it hurts him that Yeon rejects him so much.
• Sanemi: He respects him more than he admits. He sees in him someone with a similar anger to his own. Sometimes he provokes him on purpose.
• Giyu: He observes him silently. He thinks he is strong, but too impulsive.
• Obanai: He finds it vulgar and irritating.
• Mitsuri: He seems “a little scary but a good guy inside”.
• The rest of Hashira: They consider him talented but problematic.

• Giyu: It's the most awkward relationship. Giyu doesn't know how to approach him, and Ren isn't making any effort. There's respect, but also a lot of distance.
• Sanemi: He says he is “too quiet and weird”.
• Tengen: He tries to include him in conversations and Ren ignores him.
• Shinobu: She finds him interesting, but is concerned about how closed off he is.
• Rest: They see him as a younger and colder version of Giyu.

Obanai: Extremely protective and jealous. He controls her more than he should. He is proud, but finds it difficult to show.
• Mitsuri: She adores her. She hugs her whenever she can and gets excited about everything she does.
• Sanemi: He tolerates her because she is Obanai's daughter, but he finds her too sweet.
• Other Hashira: They generally like her, although some find her intense.

Most Hashira don't quite know what to do with him.
• Sanemi is one of the few who respects him (“at least he doesn’t act all important”).
• Giyu observes him with a certain silent understanding.
• Tengen tried to speak to him once and received only a cold stare.
• In general, they see him as someone competent, but impossible to approach.

All the Hashira treat her with great respect and care because she is from the Ubuyashiki family.
• Kagaya (her father) trusts her deeply.
• Gyomei treats her with special kindness.
• The others avoid being too harsh around her.
• Some underestimate their fighting ability because of their serene appearance.

Yeon
• Trauma: He feels he will never be enough for his father, and at the same time hates needing his recognition.
• Weakness: His pride and temper lead him to fight when he should wait. He has a real fear of abandonment, although he disguises it with aggression.
Ren
• Trauma: He grew up feeling loved by his father, but didn't know how to show it. He interprets Giyu's silence as indifference.
• Weakness: He tends to shut down too much. He finds it difficult to ask for help even when he is hurt. He can become cold even towards those who care about him.
Akari
• Trauma: She has a deep fear of being abandoned or replaced (emotional inheritance from both parents).
• Weakness: Her jealousy and possessive side. When she feels that someone important is drifting away, she can act impulsively or hurtfully.
Hayato
• Trauma: He was orphaned at a very young age and learned that depending on someone ends in pain.
• Weakness: He trusts almost no one. He has self-destructive tendencies (he overexposes himself in combat, he smokes, he avoids proper medical care). He believes he doesn't deserve to stay anywhere.
Tomoko
• Trauma: Since childhood, she has carried the weight of the Ubuyashiki surname and her family's illness. She knows her lineage is cursed.
• Weakness: She demands too much of herself. She tends to silently carry the emotions of others and finds it difficult to show when she herself is feeling down. She is afraid of disappointing her family.

• Yeon Uzui (de facto leader by character, although he doesn't admit it)
• Ren Tomioka
• Akari Iguro
• Hayato
• Tomoko Ubuyashiki (perhaps as a support/strategist rather than a frontline combatant)

KIMETSU NO YAIBA BREATHING
Original breathing:
• Breath of the Sun Main user: Yoriichi Tsugikuni Also used by Tanjiro (he awakens it later) It is the original breathing technique from which almost all others are derived.
Main breathing patterns:
• Water Breathing Main user: Giyu Tomioka Also used by Tanjiro (at the beginning), Sabito, and Makomo
• Breath of the Flame Primary User: Kyojuro Rengoku Rengoku Family
• Breathing of Lightning / Thunder Main user: Zenitsu Agatsuma Also Jigoro Kuwajima and Kaigaku
• Wind Breathing Main User: Sanemi Shinazugawa
• Breathing Stone Main User: Gyomei Himejima
• Mist Breathing Main User: Muichiro Tokito
• Insect Breathing Main User: Shinobu Kocho Flower Derived
• Breath of Love Main User: Mitsuri Kanroji Derived from the Flame
• Breath of Sound Main User: Tengen Uzui
• Snake Breathing Main User: Obanai Iguro
• Breath of the Flower Users: Kanae Kocho and Kanao Tsuyuri
Other breathing techniques:
• Beast Breathing Created by Inosuke Hashibira (self-taught)
• Moon Breathing Used by Kokushibo (Upper Moon 1) It is a distorted version of Sun Breathing
• Sun Breathing (complete) Tanjiro masters it in the final battle
Summary of referrals:
• Most things came from the Sun (Water, Flame, Thunder, Wind, Stone, etc.)
• Insect comes from the Flower
• Love comes from the Flame
• Beast is independent (created by Inosuke)

Yeon has the breath of Sound.
Ken has the breath of Water.
Hayato has the breath of the Wind.
Akari has the breath of the Bond (Serpentine Love).
Tomoko has the Lotus Breath.

1. Makio: Physical Appearance: Athletic build, average height, hazel eyes. Brown hair in a ponytail with two blonde streaks in the front. Clothing: Short, crimson red dress with a plunging neckline, black sash (obi), and bandages on wrists and calves. Personality: Strong, impulsive, and loud. She loses her temper quickly (especially with Suma), but is very protective. 2. Suma: Physical Appearance: The shortest, youthful features, large blue eyes. Straight black hair with a blunt fringe. Clothing: Short black or navy blue dress with a V-neck, white obi, and bandages on her legs. Personality: Crybaby, melodramatic, and easily frightened. She panics easily, although she is completely loyal in combat. 3. Hinatsuru: Physical Appearance: The tallest and most slender, mature appearance, violet eyes. Long black hair in a ponytail and a mole under her left eye. Clothing: Light purple dress with a square pattern (the longest and most modest of the three designs). Personality: Mature, calm, and strategic. She is the voice of reason in the group, very brave and tactically minded.

1. Tengen Uzui (former Hashira of Sound)
   Endurance and fitness training
   • Running many laps at a very high pace through mountains and difficult terrain.
   • Tengen gives almost no rest and mocks those who fall behind.
   • It is the first filter test: many do not even make it through this stage.
2. Muichiro Tokito (Hashira of the Mist)
   Rapid movement training
   • They practice swings (sword strikes) and fights against him.
   • The goal is to learn to tense and relax your muscles smoothly in order to move faster and with better coordination.
   • Muichiro is cold and direct; if you don't improve, he'll leave you practicing until the training pole breaks.
3. Mitsuri Kanroji (Hashira of Love)
   Flexibility training
   • They dance non-stop to the rhythm of the music.
   • Then Mitsuri stretches them by force using his superhuman strength.
   • It seems like the “mildest” thing, but it hurts a lot and leaves almost everyone completely wrecked.
4. Obanai Iguro (Hashira of the Snake)
   Sword technique correction
   • They fight against him and have to anticipate his twisted and unorthodox (snake-style) attacks.
   • In the case of some (like Tanjiro), it places tied-up demon slayers as obstacles to be avoided while fighting.
   • He is very strict and has no patience with mistakes.
5. Sanemi Shinazugawa (Hashira of the Wind)
   Endless punch training
   • Sanemi attacks them relentlessly, without rest.
   • Training only ends when the hunter vomits or faints.
   • It's pure toughening: learning to endure pain and keep standing.
6. Gyomei Himejima (Hashira of the Rock)
   Muscle strengthening training
   Three tests in order:
7. To stand under a waterfall of icy water.
8. Carry three heavy logs on your shoulders.
9. Push a huge rock for approximately 109 meters (1 chō).
   It's the most physically brutal training. Gyomei does it with complete seriousness and calm.

Important notes:
• Giyu Tomioka and Shinobu Kocho do not participate as instructors.
• Shinobu is working on special poisons.
• Giyu refuses to train others (due to personal reasons).
• The Hashira also use this period to train among themselves and seek the conditions to activate the Hunter's Mark.

The Blacksmiths (Blacksmiths' Village)
Hotaru Haganezuka
Physical appearance: Tall man, always wearing a Hyottoko mask (traditional clown face).
Clothing: Blacksmith's clothes + the mask that he almost never takes off.
Personality: Extremely passionate and obsessive about swords. He becomes incredibly enraged if anyone damages one of his creations (which is why he relentlessly pursues Tanjiro). Deep down, he is very dedicated to his work.
Tecchin Tecchikawahara
Physical: A small, robust old man, the village chief.
Clothing: Traditional blacksmith's clothing.
Personality: Wise, serious, and responsible. He is the authority of the Blacksmith Village and takes protecting the village and the secret of the Nichirin blades very seriously.
Kotetsu
Physical: Small child.
Clothing: Simple clothes + a large oni mask covering his head.
Personality: Insecure at first and afraid of not living up to his grandfather (the previous caretaker of the mechanical scarecrow). Later he demonstrates courage and a willingness to help.
Other blacksmiths in the village
They are a group of men and women who live in isolation, dedicated exclusively to forging Nichirin blades. They are reserved, hardworking, and fiercely protective of their techniques. The entire village is hidden so that Muzan will never discover the origin of the only weapons capable of killing demons.

The Infinite Castle
It is an alternate dimension created and controlled by the demon Nakime (the one who plays the biwa).
Main features:
• It is a huge, labyrinthine, and infinite space.
• It consists of thousands of rooms, corridors, doors and Japanese structures that connect in impossible ways.
• Nakime can change her structure at will just by touching her biwa: she moves rooms, separates people, unites them, throws them into the void, etc.
• It doesn't follow the normal laws of space. You can open a door and appear miles away or on a completely different floor.
• It has a dark atmosphere, with lots of wood, tatami mats, lanterns, and an oppressive feeling

Only demons can enter, no one else.

Important locations in Kimetsu no Yaiba
Sagiri Mountain
Where Sakonji Urokodaki lives. Tanjiro trains there for two years before the Final Selection. A quiet, wooded, and secluded place.
Final Selection Mountain
Mount Fujikasane. Filled with captured demons. Aspiring demon hunters must survive for seven days to become hunters.
Butterfly Farm
Shinobu Kocho's house. It serves as a hospital and recovery center for injured hunters. Aoi, Kanao, and the girls live there.
Ubuyashiki Mansion
Residence of the Ubuyashiki family. Place where the Hashira gather and the most important orders are given. Very serene and elegant atmosphere.
Entertainment District (Yoshiwara)
Tokyo's red-light district. Home of the Tengen, Daki, and Gyutaro arch. Full of lights, brothels, and people.
Blacksmiths' Village
Hidden village where Nichirin swordsmiths live (Hotaru Haganezuka, Tecchin, etc.). Very hidden and protected.
Infinite Castle
A dimension controlled by Nakime. It is the final battleground where almost all the Upper Moons and Muzan clash. A distorted and labyrinthine space.
Infinity Train
The famous train from the Rengoku arc. A real train that is attacked by Enmu.
Other recurring locations:
• Towns and mountains where they do missions
• The temporary headquarters of the Hashira
• The district where Tengen lives with his wives

Kasugai Crows (the messenger crows of the Hunter Corps)
General appearance:
They look like ordinary black crows at first glance, but they speak with human voices. They often carry messages attached to them or simply shout them out.
Personality / traits:
• Most of them are serious, direct, and a little rude.
• They speak in a curt and straightforward manner.
• They are very loyal to the Corps and do their job even if it is dangerous.
The most well-known: Tanjiro's Crow (Matsuemon Tennoji)
• He is especially loud, dramatic, and talkative.
• He has a strong personality and thinks he's important.
• He shouts messages with a lot of energy and sometimes argues with Tanjiro.
• Unlike other more serious crows, this one has quite a bit of personality and ego.
Function:
They serve as messengers for the Hunter Corps. They carry orders, mission information, danger warnings, and communications from the Hashira or the Ubuyashiki family. They are essential to the organization.
Yeon, Akari, Hayato, Ren and Tomoko each have one.

Ubuyashiki Family (summary)
Kagaya Ubuyashiki
Physical appearance: Man with a frail and sickly appearance, very pale skin, light eyes.
Clothing: Elegant dark kimono.
Personality: Extremely calm, wise, kind, and charismatic. Despite his illness, he exudes a natural peace and authority. He deeply cares for all hunters.
Amane Ubuyashiki
Physical appearance: Woman with black hair and a serene expression.
Clothing: Sober traditional kimono.
Personality: Quiet, loyal, and dedicated. She is always by Kagaya's side and calmly supports his decisions.
Daughters of the Ubuyashiki (Hinaki, Nichika, etc.)
Physical appearance: Delicate appearance, dark hair, fine features typical of the family.
Clothing: Simple and elegant kimonos.
Personality: Polite, calm, and mature for their age. They help at meetings and support their father. They have a calm and respectful presence.
Kiriya Ubuyashiki (the youngest son)
Physical description: Small boy with black hair.
Clothing: Traditional kimono.
Personality: Initially insecure, but demonstrates great courage and maturity when he has to assume leadership after his father's death. He becomes more resolute over time.
The family is generally characterized by its elegance, calmness, and the weight of the curse they bear (the illness that weakens them because they are descendants of Muzan). Despite this, they maintain a serene and compassionate attitude.
(Tomoko Ubuyashiki is also the daughter of Kagaya and Amane)

Gyomei Himejima (Hashira of the Rock) Physical Appearance: Enormous (over 2 meters tall), extremely muscular, blind. Attire: Uniform with a large beaded rosary, robe, and sandals. Personality: Calm, deeply religious, kind, and protective, but devastating in combat.
Tengen Uzui (Hashira of Sound) Appearance: Very tall and muscular, silver-white hair adorned with jewels. Attire: Open uniform, jewelry, makeup, and a striking cape. Personality: Extravagant, egocentric, fun-loving, and very confident. He likes everything "flamboyant." Kyojuro Rengoku (Hashira of Flame) Appearance: Athletic, blond hair with red tips, always smiling. Attire: Uniform with a white and red flame haori. Personality: Energetic, optimistic, honorable, and extremely passionate.
Giyu Tomioka (Water Hashira)
Physical appearance: Tall, thin and toned, serious expression.
Clothing: Uniform with two-colored haori (red and green/turquoise).
Personality: Quiet, distant, introverted and of few words.
Muichiro Tokito (Hashira of the Mist)
Physical appearance: Delicate-looking teenager, bluish-black hair.
Attire: Uniform with mist haori.
Personality: Distracted, apathetic and with a fragile memory, but becomes very serious in battle.
Shinobu Kocho (Insect Hashira)
Physical appearance: Short and thin, black hair with purple tips.
Clothing: Uniform with butterfly haori.
Personality: Sweet and smiling on the outside, sarcastic and resentful on the inside.
Mitsuri Kanroji (Hashira of Love)
Physical appearance: Curvy, pink hair with green highlights.
Clothing: Modified uniform (more fitted) with green haori.
Personality: Very cheerful, emotional, strong, and a little socially awkward.
Sanemi Shinazugawa (Hashira of the Wind)
Physical appearance: Muscular, spiky white hair, covered in scars.
Clothing: Open uniform that leaves the chest exposed.
Personality: Aggressive, foul-mouthed, irritable, and constantly bad-tempered.
Obanai Iguro (Hashira of the Snake) Physical Appearance: Slim, black hair, mouth covered

Tanjiro Kamado
Physical appearance: Burgundy hair, scar on his forehead, reddish-green eyes. Athletic and resilient.
Clothing: Hunter uniform + black and turquoise plaid haori (his father's).
Personality: Kind, determined, empathetic, and good-hearted. Always tries to understand others, even demons.
Nezuko Kamado
Physical appearance: Black hair with orange tips, pink eyes, small fangs.
Clothing: Pink plaid kimono + bamboo muzzle.
Personality: Sweet and protective of her brother. Usually quiet (hardly speaks), but fierce when she fights. Very attached to Tanjiro.
Zenitsu Agatsuma
Physical appearance: Blonde hair, frightened expression.
Clothing: Uniform + yellow haori with white stripes.
Personality: Cowardly, whiny, and dramatic when awake. When asleep or serious, he becomes extremely competent and brave.
Inosuke Hashibira
Physical: Muscular, bluish-black hair, always with a boar's head.
Clothing: Only pants and the boar mask (he almost never wears a shirt).
Personality: Wild, competitive, shouts a lot and likes to fight. Deep down he is loyal and has a good heart.
Shinobu Kocho
Physical appearance: Short, thin, black hair with purple tips.
Clothing: Uniform + butterfly haori.
Personality: Smiling and polite on the outside, sarcastic and full of resentment on the inside. She deeply hates demons.
Kanao Tsuyuri
Physical appearance: Shoulder-length black hair, usually blank expression.
Clothing: Hunter uniform + butterfly haori (similar to Shinobu's).
Personality: Very quiet and indecisive at first (she decided everything with a coin toss). Gradually she becomes more expressive and determined.
Girls from the Butterfly Farm
• Aoi Kanzaki: Serious, responsible, and a bit of a tsundere. Main manager of the estate.
• Sumi, Kiyo, and Naho: The three little helpers. Cheerful, hardworking, and very attached to Tanjiro and Nezuko. They are usually together and are quite innocent.

Muzan Kibutsuji
Physical:
Appearance of a young and elegant man (although he is over a thousand years old). Wavy black hair, intense red eyes with characters in the pupils. Slender but imposing build. Can change shape at will (man, woman, child, etc.).
Outfit:
An elegant black suit with a patterned vest, white tie, white trousers, and a white hat with a black band. He always looks impeccable and sophisticated. In his true form, he is far more monstrous and venomous.
Personality:
Cold, arrogant, sadistic, and extremely proud. He despises humans and considers demons mere tools. He is paranoid, controlling, and intolerant of failure.
He acts calmly and elegantly, but can become hysterical and violent when he feels his life is in danger. His only true goal is to overcome his weakness to sunlight and become perfect/immortal.
He is Shizuka's father.

Rui (Lower Moon 5)
White-haired, pale-skinned boy. Dark kimono. Obsessed with having a "family," cruel and lonely.
Kaigaku (Upper Moon 6)
Young man with black hair and green eyes. Hunter uniform transformed into a demon. Arrogant, resentful, and a traitor (former partner of Zenitsu).
Gyokko (Upper Moon 5)
Deformed body with an elongated head and pale skin. It emerges from vases. Sadistic, artistic, and obsessed with macabre beauty.
Hantengu (Upper Moon 4)
Small, cowardly old man. He splits into clones that represent emotions (anger, pleasure, etc.). Whiny and manipulative.
Enmu (Lower Moon 1)
Thin man with black hair and strange eyes. Elegantly dressed. Sadistic, he loves to play with dreams and mental suffering.
Rokuro (Lower Moon 2)
Man with a scarred face and a serious expression. Underdeveloped. Loyal to Muzan and of a cold nature.
Wakuraba (Lower Moon 3)
A demon with markings on his face and an aggressive expression. Swift and arrogant, he is overly confident in his speed.
Mukago (Lower Moon 4)
Feminine and timid appearance. Cowardly, one of the first to want to flee when Muzan gets angry.
Kamanue (Lower Moon 6)
His face is nervous and marked. Fearful and weak-willed, he also shows fear in front of Muzan.
Kyogai (formerly Lower Moon 6)
Man with a drum on his body and inverted eyes. Frustrated, bitter, and obsessed with regaining his rank. He controls the space by beating his drums.

Upper Moons):
Kokushibo (Upper Moon 1)
Physical appearance: Tall, long black hair, six eyes.
Appearance: Dark black kimono.
Personality: Serious, proud, melancholic, and extremely powerful. Brother of Yoriichi.
Taming (Upper Moon 2)
Physical appearance: Tall, light blond hair, rainbow eyes.
Appearance: Red kimono with fans.
Personality: Always smiling, fake, manipulative, and devoid of real emotions. Extreme cannibal.
Akaza (Upper Moon 3)
Physical appearance: Muscular, red hair, marks on the face.
Appearance: Red vest and martial arts pants.
Personality: Obsessed with strength, respectful of the strong, hates the weak.
Hantengu (Upper Moon 4)
Physical appearance: Small and fearful old man (his clones are large and distinct).
Appearance: Simple clothes, always scared.
Personality: Cowardly and whiny, but his emotions (clones) are violent and dangerous.
Gyokko (Upper Moon 5)
Physical appearance: Deformed, elongated head, pale skin.
Appearance: Foreign body, sometimes comes out of vessels.
Personality: Sadistic, artistic and obsessed with macabre “beauty”.
Daki (Upper Moon 6)
Physical appearance: Beautiful woman, long white hair with green highlights.
Appearance: Elegant oiran kimono.
Personality: Arrogant, cruel, and spoiled.
Gyutaro (Upper Moon 6)
Physical appearance: Thin, hunchbacked, green hair, sickly skin.
Appearance: Torn and dirty clothes.
Personality: Resentful, aggressive, and protective of his sister Daki.
Nakime
Physical description: Woman with very long black hair.
Appearance: Dark kimono, always with his biwa.
Personality: Quiet, loyal to Muzan, and controls the Infinite Castle.

The concept of Kimetsu no Yaiba is this:
It's an action-drama story set in Taisho-era Japan, where demons exist that feed on humans. These demons are supernatural creatures created from a man named Muzan Kibutsuji, and can only be destroyed by beheading them with special swords made of a unique mineral, or by exposing them to sunlight.
To combat them, there is a secret organization called the Demon Slayer Corps. The slayers use a combat system based on Breathing Techniques (fighting styles that mimic elements such as water, fire, lightning, wind, etc.) and are organized into ranks, with the strongest being the Hashira (Pillars).

Tomoko Ubuyashiki
Physical
Approximate height 1.60 m. Slender and delicate build. Very long silvery-white hair, styled in a heart shape on the forehead with a side braid. Fair and smooth skin. Light eyes (usually closed or squinted with a serene expression). Fine and elegant features, typical of the Ubuyashiki family.
Outfit
Standard uniform of the Hunters Corps in a dark blue, almost black, classic cut, buttoned to the neck. Simple white belt. Wide-legged trousers in the same color. High white boots with crisscrossed laces and small bows. Look neat, tidy, and elegant at all times.
Personality
Calm, kind, and soft-spoken. She always maintains a serene smile and a polite demeanor. She is extremely observant and easily perceives the emotional state of others.
Although she appears fragile, she possesses great inner strength and a maturity beyond her years. She speaks calmly even in tense situations and rarely loses her composure.
She is empathetic and genuinely cares about the people around her, but she also knows how to be firm when necessary. She doesn't raise her voice; her way of commanding respect is precisely through her composure.
He silently carries the weight of the Ubuyashiki name and his family's destiny, though he rarely mentions it. He prefers to listen rather than speak, and when he does, his words are usually precise and comforting.

Hayato
Orphaned at a very young age
Physical
Approximately 1.82 m tall. Very muscular and defined physique, broad shoulders, and powerful arms. Bluish-black, messy, and unruly hair. Sharp green eyes and a perpetually serious or annoyed expression. He has a scar across his mouth and another on his neck. Fair skin with several marks from past battles.
Outfit
A very fitted black turtleneck t-shirt. Wide, loose black trousers with large light green pockets. A simple black belt. Black fingerless gloves and white bandages on both forearms. Black and white high boots with crisscross details. A practical, dark, and slightly streetwise style.
Personality
Quiet, distrustful, and taciturn. He grew up alone, so he learned not to depend on anyone. He's cold on the outside and very difficult to approach; he looks at almost everyone with suspicion.
He has a dry and curt demeanor. He doesn't tolerate nonsense or overly cheerful people. When he speaks, he's usually direct and unfiltered.
Although he pretends not to care about anyone, deep down he's extremely loyal to the few people he manages to accept as close. He protects them silently and in his own way, without openly showing it.
He hates being pitied for being an orphan. He prefers to be treated normally, or even harshly. He has a rather self-destructive side: he smokes, gets into unnecessary fights, and carries everything on his own.
In combat, he becomes cold, precise, and brutal. He doesn't talk much, he just acts.

Akari Iguro
Daughter of Obanai Iguro and Mitsuri Kanroji
Physical
Approximate height 1.65 m. Slender, curvy build with a defined waist. Long, light pink hair, tied back in a high ponytail with loose strands. Pink eyes with vertical pupils (inherited from Obanai). Fair skin and a soft yet intense expression. She has a small, thin scar near her left eye.
Outfit
A close-fitting black uniform of the Chasseurs Corps with a high collar. A light pink cape fastened with a pink and gold butterfly brooch. Black flared trousers with a decorated purple lining. High white stockings and traditional sandals with pink ribbons. She carries a pink naginata with flowers and pearls on the handle.
Personality
Sweet and smiling on the outside, but with a very possessive and jealous side (a mix of Mitsuri and Obanai). She's kind to people she likes, especially the weak, but becomes cold and cutting if someone gets too close to the people she cares about.
She is extremely loyal and protective. She has an intense and somewhat obsessive side: when she becomes attached to someone, she becomes very clingy and jealous.
She speaks in a soft, polite voice, but doesn't hesitate to use a venomous tone when angered. She hates lies and hypocrisy. In combat, she becomes serious, swift, and lethal, without entirely losing her elegance.
He loves sweet food and gets excited easily, although he tries to keep his composure so as not to seem "too" like his mother.

Ren Tomioka
Physical
• Height: around 1.78 – 1.80 m
• Slim but toned build, with defined abdomen and chest (not as massive as Yeon, more agile and stylized)
• Fair skin
• Messy black hair with intense red highlights, medium-length and rebellious hairstyle, with two thin braids that fall down her chest
• Sharp, bluish-gray eyes (similar to Giyu's), with a serious and somewhat distant expression
• Has a mole or small mark near the mouth
• She is wearing a black choker and long gold earrings

Outfit
Based directly on the image:
• Bright red, open haori that leaves the chest exposed
• Underneath, she wears a short, dark blue garment.
• Wide, loose-fitting blue-gray trousers with gold trim details.
• Simple silver belt
• Blue gloves or forearm protectors with gold rings
• Traditional red sandals (zori)
• He carries his katana on his back with a sheath decorated in black and gold
• Overall style: a blend of Giyu's understated elegance with a more rebellious and eye-catching touch thanks to the red color and the bare chest.

Personality
Ren is quite different from his father, although he shares some things with him:
• Quiet and observant most of the time, but not as emotionally closed off as Giyu
• He has a drier, more sarcastic demeanor. When he speaks, he tends to be direct and somewhat curt.
• He's not aggressive like Sanemi, but he is quite cold when he doesn't like someone.
• He finds it difficult to express affection, although deep down he is loyal and protective (especially with people he considers close)
• He has a slightly rebellious side: he doesn't follow the rules just for the sake of it, and sometimes argues with superiors if he disagrees.
• He hates being treated as “the son of the Water Hashira.” He prefers to be judged by his own strength.
• In combat he becomes extremely focused and silent, almost like his father
• He has a rather pronounced dark sense of humor, although he rarely shows it.
He is 25 years old