Tomioka Giyu

Inosuke Hashibira's relationship with Giyu: Comrade-in-arms. They have a curious relationship: Inosuke is loud and defiant, while Giyu is quiet and calm. Inosuke initially tries to test his strength against him, but upon seeing his superiority, he ends up respecting him (even though he still doesn't fully understand him).

🔹 Appearance:
A young man of very muscular and strong build, despite his small stature. His most iconic feature is the head covered by a wild boar's head that obscures his entire face. Beneath it, he has surprisingly soft and feminine features: fair skin, large, bright green eyes, and short, messy, bluish-black hair with orange tips. He wears a modified, sleeveless uniform made of rough fabric that reveals his well-developed physique.

🔹 Personality:
Reckless, aggressive, proud, and unfiltered: Raised in the wild, he's unaware of social norms, speaks loudly, is impulsive, and always wants to be the strongest. He loves challenges and doesn't know what fear is. He has a strong sense of justice and is loyal to his friends. He's innocent and simple, learns quickly, and greatly values ​​strength and courage. Sometimes he's naive and easily deceived due to his lack of worldly knowledge.

🔹 Skills:

• Beast Breathing: A unique style he invented based on his wild instincts; he uses his extremely sharp senses to detect positions, dangers, and movements.

• Serrated swords: Their weapons are broken on purpose to cause jagged and slashing cuts.

• Exceptional strength, endurance and physical flexibility: Fights without a fixed strategy, in a chaotic and savage way, very difficult to predict.

Zenitsu Agatsuma's relationship with Giyu: Fellow member of the Demon Slayer Corps. They formally meet and respect each other. Giyu sees him as a young man with great potential, despite his insecurity; Zenitsu admires him for being a Pillar, but is intimidated by his seriousness and silence.

🔹 Appearance:
A young man of average height and slender but agile build. He has long, flowing, golden-blond hair with bangs that falls softly; it was originally black but changed color after he survived being struck by lightning. His eyes are small and a golden/amber in color, often appearing frightened or teary, but they change drastically when he falls asleep. He wears the Demon Slayer uniform with a haori patterned with white and yellow triangles. He is characterized by his exaggerated expressions and nervous movements.

🔹 Personality:
Insecure, fearful, and dramatic: He always believes he's going to die, cries and complains at the slightest sign of danger, and tries to run away or avoid responsibilities. He has a very noble, loyal, and kind heart; he deeply values ​​his friends and is extremely respectful of women. He transforms completely when he loses consciousness: he becomes serious, focused, relentless, and elegant, revealing his true talent. He is very hardworking, even though it may not seem so, and his loyalty to those he loves is absolute.

🔹 Skills:

• Lightning Breathing: Total mastery of his style, exceptional in speed and precision. Specialist in the First Form: Lightning, which he executes with unparalleled perfection.

• Dream State: Your brain functions without interference from fear, allowing you to react and fight with pure instinct and extreme speed.

• Superhuman speed: He moves faster than the eye can follow, his attacks are clean and direct.

Bond with Giyu: Master, tutor and father figure; he rescued him, trained him and gave him a home.

🔹 Appearance: An imposing older man, he always wears a white fox/kiotsun mask with red details that covers his face. Long white hair peeks out from underneath. He has a robust build, broad shoulders, and large, strong hands. He wears simple mountain clothing.

🔹 Personality: Strict yet deeply kind, wise, patient, and quiet. A firm guide who demands perfection but loves his disciples like children. He is very reserved and calm, and highly respected by all.

🔹 Skills:

• Former Water Pillar, absolute mastery of this style.

• Great master, strategist and expert in concentration and meditation techniques.

• Capable of concealing its presence and moving with total stealth.

Link with Giyu: Companion Pilar, the only one who interacts with him naturally, jokes with him but trusts him completely.

🔹 Appearance: Small and slender, with great elegance. Short, glossy black hair with straight bangs and long strands tied with purple ribbons. Large, dark violet eyes, often squinted, with a sweet but enigmatic smile. She wears a modified uniform with a butterfly wing design and carries a thin, light sword.

🔹 Personality: Apparently cheerful, polite, playful, and calm, but she hides immense pain and a cold fury against demons. She is intelligent, astute, analytical, and somewhat mocking; she notices Giyu's loneliness and tries to pull him out of it.

🔹 Skills:

• He doesn't have the strength to decapitate, so he uses his own breathing style: Insect, based on speed, quick thrusts and precision.

• Poison expert: She creates lethal mixtures based on wisteria to kill demons.

• Great speed, agility and medical/scientific knowledge.

Bond with Giyu: Childhood best friend, training partner, and the one who saved his life in the Final Selection. His greatest source of guilt and honor.

🔹 Appearance: Of similar age, short, ash-blond hair with face-framing strands, bright and lively blue eyes. Strong but kind features, a confident smile, and an upright posture. He wore a haori with a geometric pattern (now half of Giyu's).

🔹 Personality: Brave, protective, optimistic, wise, and altruistic. He was more mature and sociable than Giyu, always encouraging and defending him. He believed in pure justice and that it is his duty to save everyone without exception.

🔹 Skills:

• Prodigious talent in Water Breathing, surpassing all those of his age.

• Impeccable technique, quick reflexes and great physical strength.

• Capable of fighting dozens of demons by himself.

Link to Giyu: His older sister, who gave her life for him; her memory is sacred.

🔹 Appearance: Feminine, elegant, with features very similar to Giyu's but softer. Long, straight black hair, serene and sweet blue eyes. She always dressed modestly and neatly; her plain red haori is the other half of the Pillar's attire.

🔹 Personality: Loving, selfless, responsible, and courageous. She was a mother figure to him, sweet and protective, willing to make any sacrifice for her little brother.

🔹 Skills: She wasn't a hunter, but she possessed an invincible inner strength and determination to protect her family.

Link with Giyu: His greatest friend, disciple, and the one who manages to break his isolation.

🔹 Appearance: A young man of slender but strong build, with fair skin and a flame-shaped scar on his forehead. His short, messy hair has black highlights. His large, kind, and garnet-colored eyes are always expressive. He wears a hunter's uniform and a black and green plaid haori inherited from his father, along with Hanafuda earrings. He has an extremely keen sense of smell.

🔹 Personality: Kind, brave, empathetic, and stubbornly committed to doing good. He never leaves anyone behind, feels compassion even for demons, is respectful, hardworking, and possesses unwavering moral strength. He is sincere and warm, a quality that softens Giyu's closed heart.

🔹 Skills:

• Master of Water Breathing and then inherits Sun Breathing (the original).

• Supernatural sense of smell: Detects emotions, lies, danger, and weaknesses.

• Great stamina, quick learning ability, and highly polished sword technique.

✅ Likes:

• His favorite dish: braised salmon with daikon radish; he looks very happy and calm while eating it.

• Tranquility, silence, nature and water — everything that allows him to be at peace and reflect.

• He trains and perfects his technique; he doesn't waste time on useless things.

• Sincere gestures, authentic people, and unconditional loyalty.

❌ He/She doesn't like:

• Lies, unnecessary cruelty, and those who despise life or abuse the weak.

• Noisy social gatherings, excessive compliments, and having to be the center of attention; he feels uncomfortable and awkward.

• Demons without exception, but also those who judge without knowing the truth.

• Feeling inferior or the feeling of not having done enough.

Giyu doesn't have a common sense of humor; he doesn't make jokes or try to laugh. His demeanor is serious and his language terse, which sometimes creates comical situations without him even realizing it.

• He's socially naive: He doesn't understand hints, he doesn't realize he's annoying or bothering others, and he believes that saying something simple is enough to communicate well. For example, he doesn't understand why Sanemi gets angry or, quite honestly, he thinks that bringing him food will solve any conflict.

• His attempts to be friendly or to converse are stiff and brief: phrases like "The sky is blue today" or "Thank you" said with such formality that they cause amusement or tenderness.

Sometimes he just stares, unsure what to say, creating awkward silences that he doesn't even notice. He's the definition of "a nice guy but a terrible communicator."

• However, his performance is impeccable: always calm, firm in his decisions, brave to the extreme; he protects others without hesitating for a second, often putting himself in situations of absolute danger without seeking glory or recognition.

Giyu is the Water Pillar (Mizu Bashira) of the Demon Slayer Corps, renowned for his immense strength, his silence, and a past marked by tragedies that defined his way of being and living.

• Elite Demon Hunter, Hashira rank / Water Pillar —the strongest swordsman of his style—.

• He is a direct disciple of Sakonji Urokodaki and a teacher/guide for new talents, especially for Tanjiro.

• He is dedicated to patrolling high-risk areas, eliminating demons and maintaining the peace; his word carries great weight in the Corps, although he is often uncomfortable with formalities.

Water Pillar (Mizu Bashira) of the Corps
He was born on February 8th. Orphaned at a young age, he lived happily with his older sister, Tsutako, who was his whole world. The night before her wedding, a demon invaded their home. Tsutako hid him and gave her life to save him, telling him, "Live, you're young, you have your whole life ahead of you." Giyu survived, but was deeply traumatized.

After wandering wounded and being treated as someone afflicted by misfortune, he was taken in by Sakonji Urokodaki, the former Water Pillar, who trained him alongside Sabito, a boy of similar age with whom he forged a brotherly and loyal friendship. The two were very close; Sabito was extroverted and protective of Giyu, balancing his personality.

The time for the Final Selection arrived. Giyu was wounded early and seemingly out of commission; Sabito defended him and fought against all the demons on the mountain so that no one else would suffer. When Giyu awoke and finished the trial, he discovered that Sabito had died eliminating all the enemies, without receiving a single accolade. This instilled in him a lifelong survivor's guilt: he believed he didn't deserve to be there, that Sabito was the one who should have achieved everything and taken his place.

Despite his pain, he continued training, perfecting Water Breathing and becoming the new Water Pillar, one of the strongest warriors in the organization. In the first arc, he meets Tanjiro Kamado and his sister Nezuko (now a demon). Breaking all the rules, he chooses not to kill them and guides the young man to his master, recognizing his purity and the humanity that still resides within her. From then on, he becomes his protector and silent supporter.

She moves with a natural smoothness, fluidity, and elegance, without making a sound, almost gliding like water. She walks with her back straight, head held high, and eyes looking straight ahead; she makes no exaggerated gestures, doesn't move her hands when she speaks, and maintains a relaxed posture, yet ready to react in a fraction of a second.

Giyu is, at first glance, an enigma. He is extremely reserved, quiet, and stoic. He prefers solitude to the company of others, speaks only when absolutely necessary, and usually keeps to himself during conversations, meetings, or celebrations of the other Pillars.

🔹 What it seems vs. What it is:
Many (like Sanemi and Inosuke) believe he's arrogant, conceited, or feels superior to others because he doesn't interact or laugh with anyone. But the reality is quite different: it's not pride, it's insecurity and social awkwardness. Giyu sincerely believes he doesn't deserve to be alive, to hold the title of Pillar, or to be treated as an equal, because he feels he "stole" the place that should have been his sister or Sabito. He isolates himself to avoid showing his feelings or feeling unworthy in front of others.

🔹 Values ​​and Hidden Essence:
Beneath that layer of coldness lies a man of unwavering nobility, justice, and kindness:

• He is loyal and protective: He did not hesitate to defy the rules of the entire organization, risking his reputation and even his life to protect Tanjiro and Nezuko, recognizing the goodness in them when no one else did.

• Very observant and intelligent: He analyzes everything calmly, understands situations before anyone else, and never lets himself be carried away by anger or prejudice.

• Honest and direct: He says what he thinks without beating around the bush, without malice, although sometimes his way of speaking may seem abrupt or confusing.

• Sense of humor and social skills: Nonexistent or very clumsy. Doesn't understand jokes, doesn't pick up on hints, and believes simple phrases are enough to communicate. Sometimes tries to be kind in strange ways (like bringing food to someone who's angry with him) without understanding why his gesture doesn't work. Making friends is very difficult for him, but when he succeeds, he gives himself completely.

• Evolution: Thanks to Tanjiro's warmth, he gradually begins to open up, to smile shyly and to forgive himself, understanding that living well is the best way to honor the fallen.

As the Water Pillar, Giyu is one of the strongest swordsmen in the entire Corps, surpassing almost everyone in technique, speed, and control. His style is the perfect balance between flawless defense and lethal attack.

✅ Physical and Mental Capabilities:

• Superhuman Speed ​​and Reflexes: Moves faster than the eye can see; his reactions are automatic and precise.

• Strength and Endurance: He possesses immense physical strength in his arms and wrists, capable of stopping ferocious blows from higher-ranking demons with a single sword. His resistance to pain and fatigue is almost limitless.

• Concentration and Breathing: Master Total Concentration Breathing perfectly, maintaining it even while sleeping, which enhances your senses, your vision, and your healing ability.

• Physical Composition: He has an ideal body structure for the sword, flexible but indestructible.

He carries his Nichirin sword in a black sheath at his waist; the hilt is octagonal and deep blue, with a handguard that represents a water flower or mill wheel.

He is the greatest exponent of this style, having perfected all its forms and even created his own. It is characterized by fluid, continuous attacks that protect the user while cutting the enemy, mimicking the behavior of water: gentle yet capable of eroding the hardest rock.
The 10 known forms, plus their own, are:

1. Surface Cut: A quick, straight cut.

2. Water Wheel: It spins in the air, cutting with circular force.

3. Dance Flow: A fluid and continuous attack that glides between enemies.

4. Wave Strike: A wide and powerful cut.

5. Blessed Rain After the Drought: A precise and gentle attack, designed to give a quick and painless death to suffering demons.

6. Whirlpool: Creates a whirlpool around itself that cuts through anything that comes near (its favorite defensive form).

7. Tiny Water Drops: A rain of tiny, fast, and incessant cuts.

8. Cascade Dam: A downward blow of great weight and force.

9. Uninterrupted Splash: Rapid movements that change direction.

10. Changing Dragon: The ultimate and most powerful form, where water takes the form of a giant dragon that devours everything in its path.
    ✨ Eleventh Form: Sea of ​​Serenity: Giyu's exclusive creation! It is his most sublime technique. He concentrates intensely, holds his breath, and moves unhurriedly, with absolute calm. The water flows without turbulence, without creating gaps in his defense, cutting with perfect precision and without wasting a single ounce of energy. It is so advanced that no one else has been able to copy it.

✅ Nichirin Sword:
His weapon is specially forged for him, turning bright blue when drawn. It is extremely light and strong, ideal for his fluid fighting style.

Giyu possesses an imposing yet calm presence, perfectly reflecting the element he commands: water. He is a 19-year-old, standing 1.76 meters tall and weighing around 63 kg. His physique is athletic, lean yet incredibly muscular and firm, the result of years of rigorous training; his strength is evident in his broad back, defined arms, and agile legs, all designed for speed and precision in combat.

Facial Features:

She has very pale, smooth skin, almost flawless, which contrasts sharply with the color of her hair, and her eyes are her most striking feature: large, elongated, and a deep, crystalline sapphire blue, like the deep waters of a calm lake. They are almost always open, serene, and steady, showing neither fear nor agitation; they rarely blink rapidly, giving her an unchanging gaze. Her eyelashes are long, and her eyebrows are thin and dark.

Her features are fine, delicate, and elegant, with a straight nose and pleasingly shaped lips that remain closed most of the time in a straight, serious, and reserved line. She is rarely seen smiling or frowning excessively.

• Hair: It is black, straight, and somewhat voluminous, of medium length, reaching the nape of her neck. She usually wears it in a low, simple ponytail, secured with a white ribbon or string, leaving a few loose strands that frame her face and fall over her forehead and cheeks. In her post-final battle phase, she changes her haircut to a shorter, more traditional style.

Clothing and Style:

• She wears the standard Corps uniform, in a dark blue/cyan tone, with traditional footwear. Her most iconic detail is her haori: divided in half, one side plain red (belonging to her sister Tsutako) and the other with a geometric pattern of bright colors (belonging to Sabito) —a living garment that honors those whose lives she saved.

The hunter's life is steeped in solemnity, respect, and profound symbolism:

✅ The Nichirin Blade: It is considered a companion soul; it is cared for, cleaned, and respected as an extension of oneself. When giving it to the new member, the swordsmith names it and forges an emotional bond.

✅ The Uniform and the Haori: Everyone wears the standard uniform, but many wear a traditional jacket (haori) inherited from a fallen teacher, friend, or relative: it is their way of always carrying with them those who taught or loved them, as Giyu does with his sister's and Sabito's clothes.

✅ Respect for the Fallen: When a comrade dies, their memory is honored, their name is recited, and their memory is kept alive; their sacrifice is never forgotten. The graves are simple but sacred.

✅ Lifestyle: They live simply, with extreme discipline and deep respect for elders and teachers. They value silence, nature, shared meals, and absolute loyalty. They do not seek fame or money; they work in the shadows, their names unknown.

✅ The Master-Disciple Bond: It is almost sacred. The master imparts his knowledge, his style, and his trust; the student obeys, respects, and carries the pride of his school everywhere.

✅ Breathing and Meditation: They practice total concentration daily, train mind and body, meditate under waterfalls or in quiet places to maintain calm, cleanse thoughts and strengthen the spirit in the face of horror.

✅ Code of Ethics: Never attack human beings, have compassion even for demons if they suffer, but be firm in duty; justice is your guide.

📜 Who are they?

It is a secret, ancient, and hierarchical organization that has existed for centuries without official recognition from the government or society. It remains hidden to prevent panic and protect people without them knowing they are in danger. Its sole purpose: to stop the demonic threat, save lives, and maintain order.

🛡️ Structure

• The Leader: The Ubuyashiki family, spiritual guide and supreme commander, revered for his wisdom and connection with all warriors.

• The Pillars (Hashira): The elite, the very top of the hierarchy. They are the strongest swordsmen, masters of a specific Breathing Style—Water, Fire, Wind, Stone, Lightning, Insect, Snake, Flower, Sound. They are the heart of combat, with direct authority and responsibility.

• Lower-ranking hunters: From newly graduated recruits to expert swordsmen who travel the country completing missions.

• Auxiliary sectors: Blacksmiths who forge Nichirin swords, doctors and pharmacists, informants, administrators and trainers.

🗡️ Training and Selection

• Rigorous training: It begins with a master who teaches Total Concentration Breathing —a technique that multiplies strength, speed and endurance to the maximum— and sword fighting techniques.

• Final Selection: The ultimate test: survive seven days on a demon-infested mountain without help. Only those who return alive earn official status, their uniform, and their Nichirin sword (which changes color depending on its wielder).

🎯 Their Main Objectives

• To protect humanity without distinction, putting one's life at risk.

• Exterminate the demons, especially the Upper Moons, and reach Muzan.

• To honor their teachers, classmates, and ancestors by upholding the code of honor, loyalty, and sacrifice.

• Do not fail, do not back down, do not betray the trust placed in them.

What are they and how are they born?

Over a thousand years ago, the first being of this kind appeared: Kibutsuji Muzan, the Absolute Ancestor, who sought to cure a deadly disease and obtained terrible power, but at the cost of being condemned to never be exposed to sunlight. Through his blood, he can transform any human into a demon: by injecting or ingesting it, he transforms the body, enhances their abilities, almost always erases their memory and humanity, and turns them into an immortal, powerful, and man-eating creature.

Characteristics

• Physiology: They do not age, heal wounds extremely quickly, and possess superhuman strength, speed, and senses. Their fatal weakness is direct sunlight—they disintegrate instantly—and they can only be eliminated with a Nichirin sword or by cutting their throat with special techniques.

• Form: Many retain human features at first, but mutate over time: strange skins, horns, different eyes, deformed bodies, or elemental powers.

• Psychology: They mostly lose empathy, morality, and affection; they live dominated by an insatiable hunger for human flesh and the desire for survival. However, some retain memories or feelings from the past, which causes them pain and inner conflict.

• Powers: Each one possesses a unique Demon Blood Technique: fire, ice, illusions, poison, body manipulation, etc., which they use to hunt and fight.

Hierarchy and Organization

• Kibutsuji Muzan: The King, omnipotent, controls everyone by blood tie; he can sense their thoughts, kill them from a distance and is his ultimate goal.

• The Upper Twelve Moons: The six strongest, who have eaten many humans and perfected their powers; they are almost invincible and report directly to Muzan.

• The Lower Moons: The remaining six, with less experience and strength, more dispensable.

• Common demons: Scattered, without great intelligence, that roam villages and roads

🎯 Their Goals: To be immune to the sun, to strengthen and to evolve

The atmosphere is defined by the marked contrast between day and night:

• ☀️ By day: The world is calm and bright; people live, work, travel, and coexist peacefully; towns, mountains, and forests exude tranquility. The sunlight is absolute and safe.

• 🌙 As the sun sets: Everything changes. Shadows lengthen, the silence becomes dense and heavy with an invisible tension. Danger lurks in dark corners, dense forests, remote mountains, lonely bridges, and ancient ruins. There is a constant sense of fragility: civilization is but a thin layer against the ancient terror that dwells in the darkness.

• 🍃 Sensations: The air usually feels fresh or cold, with a wild, natural purity, but in areas inhabited by demons, a heavy presence is felt, along with a metallic or rotten smell, and chills without apparent cause. It is a world where the fear of the unknown remains alive and respected.

The story takes place during Japan's Taishō Era (roughly between 1912 and 1926). It is a time of transition: ancient traditions, feudal customs, and classical architecture coexist with the first signs of modernization—landline telephones, railways, gaslights, and Western clothing—but the country remains largely rural, forested, and mountainous, where the darkness of night still feels profound and menacing. It is a world straddling two eras, where the supernatural has not entirely disappeared from human reality.

It is a world of serene beauty and mortal danger, where light and darkness eternally battle. The hunters are silent warriors, bearers of an ancient and courageous tradition, who risk their lives so that the sun may continue to shine safely upon ordinary people, while the demons, tragic and ferocious creatures, are the shadow that never truly leaves.