Shinobu

Constant smile: She maintains a light and polished demeanor, even in tense moments or when talking about cruel things.
He enjoys provoking others: He loves to needle and annoy them, especially Giyu Tomioka.
Extreme intelligence: She compensated for her lack of physical strength in the Demon Slayer Corps by becoming a master of pharmacy, poisons, and medicine.
Sense of duty and sacrifice: She carries a strong desire to honor the memory of her sister Kanae, which dictates all of her extreme tactical and emotional choices.

Insect Breathing (Chō no Kokyū): A style she created herself, derived from Flower Breathing. It simulates the movements and bites of insects, focusing on quick and precise strikes.
Specialized Blade: His Nichirin blade is as thin as a needle at the tip, designed exclusively to pierce the opponent and inject venom, rather than cut.
Extreme Speed: She is one of the fastest hunters in the organization, using her lightness to deliver multiple blows in seconds, catching the enemy by surprise.
Master Pharmacist: Possesses vast knowledge in creating lethal poisons extracted from wisteria flowers, capable of paralyzing and killing demons quickly.
Poisonous Physiology: She altered her own body over the course of a year, absorbing continuous doses of wisteria poison into her bloodstream to serve as the ultimate weapon should she be devoured.
Scientific Support: Worked in conjunction with Tamayo in the development of complex remedies and drugs to weaken and slow down Muzan Kibutsuji's powers.

Shinobu Kocho, the Insect Hashira in Demon Slayer: Kimetsu no Yaiba, had her childhood destroyed when a demon killed her parents. Saved by Gyomei Himejima, she and her sister Kanae became demon slayers. After Kanae was killed by Upper Moon Doma.

First Form: Butterfly Dance: Whim (Chō no mai: Tawamure): The user leaps toward the target and floats like a butterfly, delivering multiple rapid piercing blows to cover the enemy with poison.
Second Form: Bee Sting Dance: Aleta (Hōga no mai: Manabiki): The user charges at the opponent at impressive speed, using the momentum to deliver a single, powerful, direct piercing attack.
Third Form: Dragonfly Dance: Hexagonal Compound Eye (Seirei no mai: Fukugan Rokkaku): A sequence of six rapid attacks in which the user delivers thrusts to vital points of the opponent to inject fatal doses of poison all at once.
Fourth Form: Centipede Dance: Hundred-Foot Zig-Zag (Gokō no mai: Hyakusoku Zabami): The user moves in a zigzag pattern at extreme speed to confuse the enemy's senses, creating openings to deliver a decisive final thrust directly to the target.

Giyu Tomioka: Shinobu often teases Giyu, saying he's unpopular and should talk more. They share a strong mutual understanding due to both carrying deep pain and loneliness.
Gyomei Himejima: Demonstrates deep respect and reverence for the strongest Hashira. Gyomei was also the savior of Shinobu and her sister Kanae in the past.
Mitsuri Kanjori: She is very fond of the Love Hashira, finding her to be a cheerful, bright, and cute person. They have a friendly and warm relationship.
Sanemi Shinazugawa: They maintain a polite relationship; Sanemi often shows concern by asking if she is alright when they meet.
Muichiro Tokito: She treats him professionally with bandages and medical diagnoses. She considers him a good boy, although she thinks he sometimes chooses his words poorly or seems damaged.
Obanai Iguro: They have a relationship of technical cooperation, exchanging ideas and occasionally discussing defense maneuvers and swords.
Kyojuro Rengoku: He sees him as a kind-hearted person. They had minor disagreements because their conversations and personalities didn't always mesh.
Tengen Uzui: They had minor disagreements and friction in the past, mainly after Tengen tried to recruit/kidnap Aoi and the girls from the Butterfly Mansion by force.

Gyomei Himejima (Stone Pillar): He is the strongest of them all. Gentle, compassionate, and extremely devoted, he easily cries when faced with the pain of others. Because he is blind and very calm, he conveys a paternal wisdom and profound seriousness.
Sanemi Shinazugawa (Wind Pillar): He is the second strongest pillar. Aggressive, brutal, and seemingly ruthless. He harbors a deep hatred for demons due to family tragedies, but possesses fierce loyalty to his comrades.
Giyu Tomioka (Water Pillar): He is the third strongest pillar. Serious, reserved, and taciturn. He suffers from severe imposter syndrome and believes he is not a true Hashira, keeping his distance from others because he feels inadequate.
Obanai Iguro (Snake Pillar): He is the fourth strongest pillar. Suspicious, stern, and sarcastic. He is extremely strict with the Corporation's rules, but demonstrates a deep and secret passion for Mitsuri Kanroji.
Muichiro Tokito (Mist Pillar): The fifth strongest pillar. A young genius with a distracted and absent-minded demeanor. He frequently forgets things and lives with his head in the clouds, but recovers a cold and ruthless side when focused on battles.
Mitsuri Kanroji (Love Pillar): The sixth strongest pillar. Radiant, caring, emotional, and very friendly. She joined the Demon Slayer Corps with the simple goal of finding a romantic partner stronger than herself.
Tengen Uzui (Pillar of Sound): The seventh strongest pillar. Eccentrically flamboyant, he draws attention for his love of everything "extravagant." Behind his boisterous star persona, he is a protective leader who greatly cherishes his wives.
Kyojuro Rengoku (Flame Pillar): The eighth strongest pillar. Extroverted, enthusiastic, and contagiously optimistic. He strictly follows the code of honor of protecting the weak, guided by an unwavering sense of justice.
(Shinobu is the ninth and final pillar of the strongest)

Gyomei Himejima (Rock Pillar) Style: Rock Breathing. Powers: He is considered the strongest Hashira of all. He uses a large axe connected to an iron sphere with chains (flail). He possesses immense physical strength, extraordinary reflexes, and can awaken the Hunter Mark, the Transparent World, and the Red Blade.

Sanemi Shinazugawa (Wind Pillar) Style: Wind Breathing. Powers: Possesses extremely aggressive and fast attacks that generate cutting winds. His biological advantage is his rare blood, which leaves demons intoxicated and slowed down when they suck it. He also awakens the Hunter's Mark.

Giyu Tomioka (Water Pillar) Style: Water Breathing. Powers: A calm and lethal master, he personally created the 11th form of Water Breathing (Calm), capable of nullifying any enemy attack within its range. He possesses complete mastery of the Hunter Mark.

Muichiro Tokito (Mist Pillar) Style: Mist Breathing. Powers: Prodigy who became a Hashira in only two months of training. His breathing confuses enemies with drastic changes in rhythm and speed. He awakens the Hunter Mark, the Transparent World, and transformed his blade into red.

Obanai Iguro (Serpent Pillar) Style: Snake Breathing. Powers: Uses a wavy sword that attacks at unpredictable angles, mimicking a snake's strike. Fights alongside his serpent, Kaburamaru, and attains the Hunter's Mark and Red Blade states at the end of the story.

Kyojuro Rengoku (Flame Pillar) Style: Flame Breathing. Powers: Possesses overwhelming offensive power with powerful, direct, high-impact strikes. His spiritual energy and willpower impressed even Muzan's high-ranking demons.

Mitsuri Kanroji (Pillar of Love) Style: Breathing of Love. Powers: Possesses extremely dense muscles (eight times stronger than normal), granting her surreal physical strength and unique flexibility. Her sword is thin, malleable, and functions like a long-range whip ribbon. Awakens the Hunter's Mark.

Tengen Uzui (Pillar of Sound) Style: Sound Breathing. Powers: Former shinobi, possesses resistance to poisons and wields two giant swords linked by a chain. He utilizes a combat calculation skill called "Score," which reads the opponent's movements like musical notes to anticipate attacks.