There are hundreds of Demon Slayers within the organization, however they are not officially recognized by the government

Breathing Techniques

Breathing Styles are swordsmanship styles

Beast Breathing

Beast Breathing is a Breathing Style that mimics beasts/wild animals, specifically their unpredictable, ferocious and wild nature, including movements, attacks and senses, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms are simple, straight-forward yet wild, unpredictable and animalistic movements and attacks, although one of them utilizes the powerful sense of touch to replicate an animal's primal senses. Users of Beast Breathing also visualize themselves seemingly manifesting the fangs and claw slashes of a wild animal when unleashing its techniques.

Flame Breathing

Flame Breathing is a Breathing Style that mimics flames and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms involve extremely powerful singular strikes which 'burn' their opponents, with most attacks being initiated from a high stance. Users of Flame Breathing also visualize themselves seemingly creating and manipulating fire when unleashing its techniques.

Flower Breathing

Flower Breathing is a Breathing Style that mimics flowers and fruits and replicates with the user's movements, techniques, and abilities. Most, if not all, known techniques and forms are a combination of graceful attacks that focus on agility. This Breathing Style also enhances and utilizes one's vision, albeit at the possible cost of their eyesight. Users of Flower Breathing also visualize themselves seemingly creating and manipulating flowers when unleashing its techniques.

Insect Breathing

Insect Breathing is a Breathing Style that mimics insects, specifically their lethal stings and movements, and replicates it with user's movements, techniques and abilities. Most, if not all, known techniques and forms include stabbing, thrusting, and making shallow cuts with a specially coated/made sword to inflict multiple wounds onto the intended target in order to inject various lethal wisteria-based poisons into them. Users of Insect Breathing also visualize themselves seemingly manifesting insects (mainly butterflies) when unleashing its techniques.

Love Breathing

Love Breathing is a Breathing Style that is based on the emotion of love. Most, if not all, known techniques form a combination of mid to long-ranged whip-like attacks that utilize the user's own flexibility, dexterity, agility and speed.

Mist Breathing

Mist Breathing is a Breathing Style that mimics mist, specifically the obscurity of mist, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms involve obscured movements and attacks performed in a swift and unique pattern, using attacks disorientate and confuse the target, similar to how a thick layer of mist obscures one's vision. Users of Mist Breathing also visualize themselves seemingly creating and manipulating mist when unleashing its techniques.

Based on Mist Breathing's only known user, Muichiro Tokito, who wears baggy clothing that covers his arms and legs in order to conceal his movements as much as possible, it can be assumed that most other users would also have to don clothing that hide their limbs from their enemy in order to fully maximize the potential of this Breathing Style.

Moon Breathing

Moon Breathing is a Breathing Style that mimics the moon and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms are standard yet varied swordsmanship techniques that focus on swift and powerful strikes that always follow the shape and pattern of a crescent moon.

Moon Breathing has the most forms. 16 total

Serpent Breathing

Serpent Breathing is a Breathing Style that mimics serpents/snakes, specifically their slithering motions, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms focuses on twisting and bending the sword like how a serpent slithers, the attacks are not direct and constantly meander which can ultimately strike anywhere. Users of Serpent Breathing also visualize themselves seemingly manifesting white serpents that accompany them when unleashing its techniques.

Sound Breathing

Sound Breathing is a Breathing Style that mimics sound, specifically its disorientating loudness, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms utilize explosives to deal massive amounts of damage while making use of extremely fast movements similar to how fast sound travels as well as the user's sense of hearing.

Stone Breathing

Stone Breathing is a Breathing Style that mimics earth and stone and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms utilize the ground beneath the user and the vast surroundings to generate powerful and sturdy attacks that specialize in both offense and defense.

Sun Breathing

The Hinokami Kagura is a Breathing Style that is passed on from father to son in every generation alongside the Hanafuda earrings. The Kamado family uses the Breathing Style within a ritual ceremony practiced every new year, where the Breathing Style user offers the Fire God a dance from sunset to sunrise to ward off threats and diseases.

Thunder Breathing

Thunder Breathing is a Breathing Style that mimics lightning, specifically swift strikes and movements akin to lightning ripping through the sky, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms involve utilizing blinding speeds and immensely fast attacks to overwhelm the enemy in an instant. Users of Thunder Breathing also visualize themselves seemingly creating and manipulating lightning and electricity when unleashing its techniques.

Water Breathing

Water Breathing is a Breathing Style that mimics water, specifically the flow, flexibility and adaptability of the liquid and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques involve the user bending their body, arm and weapon in a fluid motion to match the movements of rushing or flowing water. Users also visualize themselves seemingly creating and manipulating water when unleashing its techniques.

Wind Breathing

Wind Breathing is a Breathing Style that mimics wind, specifically powerful torrents of air and whirlwinds, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms involve purely offensive attacks, most of which utilizing rotating movements to generate swift whirlwind-like slashes that greatly increase the wielder's striking range or utilizing the air around them to deliver sharp sickle-shaped attacks. Users of Wind Breathing also visualize themselves seemingly creating and manipulating wind when unleashing its techniques.

Recovery breathing

Tanjiro Kamado displayed a technique called recovery breathing, which, by taking a brief moment to focus and steady his breath, allows him to recover from fatigue and stiff muscles that prevent his body from moving after using Hinokami Kagura twice in a row. He used this after he had collapsed on the ground from using Hinokami Kagura to allow his body to move again and prevent himself from dying from Daki's attack. He later tried to perform it again to prevent himself from blacking out from exhaustion and lack of breath, but couldn't find a moment to do so due to the combined assault of Daki and Gyutaro.

Total Concentration: Constant

Breathing state during the morning, noon, and night, and even while asleep that advanced Demon Slayers, such as the Hashira, can constantly maintain. There is an immense difference in strength, speed, and stamina between someone who can maintain Total Concentration Breathing at all times and someone who cannot. By doing it every minute of the day, one's physical fitness drastically improves.

Increase in both dexterity and strength by 2

Expertise in Athletics and Acrobatics

Demon Slayer Mark

Bright Red Nichirin Sword: Bearers of the Demon Slayer Mark can dye their Nichirin Swords a shining bright red color mainly through clashing their blade with another Marked swordsman's or gripping it with tremendous force. Bright red Nichirin swords have the ability to generate intense heat and also hamper the regeneration of demons, some of which on the level of the strongest Upper Ranks and the Demon King himself.

Enhanced Physical Capabilities: Upon awakening the Mark, the physical strength and speed of the bearer is exponentially increased to the point where Hashira or Hashira-level Demon Slayers are able to overpower and defeat the lowest of the Upper Ranks and fight on equal ground and grow in power comparable to the highest among them. It is implied that the bearer's physical arm strength is increased by around 100x after awakening the Mark, though it could be a hyperbole and thus the value could be much lower. The increase in the speed of the bearer is quite apparent as well, as seen with Muichiro Tokito who was having trouble dealing with Upper Rank Five's various techniques and later being capable of regularly out-speeding and even blitzing him in Gyokko's awakened form after Muichiro activated his Mark.

Enhanced Resistance: It is implied that the Mark increases the bearer's resistance to Muzan's demon-transforming blood similar to how Total Concentration Breathing does.

Transparent World

Bearers of the Mark can potentially gain access and see into the 'Transparent World', allowing them to perceive the bodies of others as if their skin was transparent. This enables them to track the flow of blood, breathing, muscular contractions and joint movements of the person they are looking at which can be used to predict their movements and evade their attacks with ease. Additionally, those who can access the Transparent World can perceive the world in slow-motion, further increasing their reaction and movement speed.