Yoriichi Tsugikuni

==Summary==
 is a major supporting character of Kimetsu no Yaiba. He is a legendary Demon Slayer who lived nearly 500 years ago during the Sengoku Era (the Golden Age of Demon Slayers), as well as the strongest Demon Slayer to have ever existed. He is also the progenitor of Breathing Styles, being the one who created Sun Breathing.
Yoriichi is the younger twin brother of Michikatsu Tsugikuni, who later became a demon and joined the Twelve Kizuki.
==Powers and Stats==
Tier: At least , likely higher
Name: Yoriichi Tsugikuni
Origin: Kimetsu no Yaiba
Gender: Male
Age: 17-24 during his prime, over 80 years old at the time of his death
Classification: Human, Demon Slayer
Powers and Abilities: 
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|-|Abilities=
*Superhuman Physical Characteristics
**Acrobatics
**Body Control & Regeneration (Low - With Total Concentration Breathing, one can stop hemorrhages)
**Extrasensory Perception (Able to sense the presence of others and malicious intent, this can be used to differentiate humans and demons, determine how strong someone is to a certain extent, or detect an enemy in the vicinity, vastly superior to the Hashira about whom Muzan stated that they could in the Entertainment District right away)
*Accelerated Development (Casually defeated an experienced swordsman after his first time holding a sword, and was considered the most talented swordsman despite putting no effort and disliking swords)
*Battle Spirit, Limited Fear Manipulation & Paralysis Inducement (Overwhelming Aura that causes the opponent fear and paralysis with them feeling the air getting heavier, and can even cause internal bleeding and external lacerations)
*Statistics Amplification (Total Concentration Breathing increases the user's speed and power to match demons. The Demon Slayer Mark drastically boosts his speed and power)
*Genius Intelligence
*Master Swordsman (Is the most powerful swordsman known so far in the series, far more skilled than the Hashira who can match opponents who have over a century's worth of combat experience)
**Sunlight Absorption (The ore of his katana (Scarlet Crimson Ore) absorbs sunlight)
**Perception Manipulation (Users of Breathing Styles can create seemingly elemental effects. Yoriichi can make others see fire and make the opponent feel like he's burning)
**Shockwave Generation (Breathing Styles allow sword forms to strike from a longer distance)
**Heat Manipulation & Regeneration Nullification with Bright Red Nichirin Sword (Bright Red Blades emit heat and are capable of inflicting wounds that burn on the cellular level. The wounds he inflicted on Muzan continued to burn for hundreds of years despite Muzan's attempts to regenerate)
*Instinctive Reaction (Far superior in reflexes and skill to Kyojuro, Mitsuri, Sanemi, and Giyu who can react instinctively)
*Perception Amplification, Information Analysis, Enhanced Sight, Analytical Prediction, & Limited Precognition with Transparent World (Transparent World makes his perception of time slow down and allows the user to see directly their opponent's muscles, blood flow and movements which allows them to predict their next moves)
|-|Resistances=
Resistance to:
*Poison Manipulation (Total Concentration Breathing grant resistance to poison and the ability to slow its circulation)
*Biological Manipulation (Users of Total Concentration Breathing are resistant to Muzan's blood which can immediately transform normal humans into demons with a scratch, leading them to require a few days to willingly transform. Can resist Muzan's injected blood which rapidly attacks and destroys cells leading to quick melting and vaporization, especially with the Demon Slayer Mark)
*Fear Manipulation & Paralysis Inducement (Should be superior to the Hashira and Muzan who are unaffected by the aura of Lower and Upper Ranks like Rui which caused intense shuddering and lack of air)
*Enhanced Senses, Analytical Prediction & Extrasensory Perception (With Selfless State, his intent becomes completely concealed and impossible to detect)
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Attack Potency: At least Large Building level, likely higher (He is the strongest Demon Slayer of all time. Easily fought and defeated a full power Muzan and cut off his head, forcing him to escape. Nearly cut Kokushibo's neck with a single attack while dying from old age)
Speed: At least Massively Hypersonic, likely far higher (Far faster than the Hashira and Zenitsu, who could do this. Blitzed Muzan and cut 1500 of 1800 flesh parts that remained of him after he exploded himself. Blitzed Kokushibo while dying of old age), higher with Transparent World
Lifting Strength: At least Class 50 (Should be superior to Gyomei Himejima as the strongest known Demon Slayer so far, Should be at least comparable to Muzan)
Striking Strength: At least Large Building level, likely higher (Easily cut off Muzan's neck)
Durability: At least Large Building level, likely higher (Should be comparable to his AP and more durable than marked Hashira)
Stamina: Superhuman (Was never shown to be tired, even as a child after running for an entire day through mountains. Far superior to Tanjiro who endured extremely taxing training for seven days non-stop with no food, no sleep, and only a small amount of water from rain, later drained for even greater stamina, was also getting injured frequently during the training session. Far superior to Inosuke who can hunt for 3 days. Far superior to the Hashira who can train for months through training that almost puts them on the verge of death and fight Lower Rank-level demons in the Infinity Castle for nearly 5 hours on top of fighting Upper Ranks)
Range: Extended Melee Range; Several Meters with Breathing Styles
Standard Equipment: Standard Nichirin Sword (A blade made from metals that absorb the light of the sun, they cause demons to completely disintegrate if they are decapitated with them, as they are weak to sunlight, which in the case of demons which have assumed a form where they don't have a neck or head in the traditional sense can be done by slicing something equivalent enough to the neck, demon limbs that are sliced off and constructs created through Blood Demon Art that are bisected through a Nichirin Sword are also subject to the disintegration, Stabs and slashes with a Nichirin sword can dispel the effects of Blood Demon Arts and can temporarily weaken a demon's power and abilities if directed at the neck), Demon Slayer Corps Uniform (Protects from the claws and slashing attacks from weaker demons, and has resistance against fire, water and cold)
Intelligence: Genius (As a child prodigy, Yoriichi is extremely intelligent. Despite not speaking for most of his childhood, his first words were very clear and pronounced. He also displayed maturity beyond his age as he noticed his mother's illness and helped her till her death. As another testament to his keen intellect, he could immediately use the Transparent World in combat despite never fighting before, being able to intuitively figure out that the lungs of people will expand before they attack and that he needed to watch their bone movement, muscle contraction, and blood flow, which he used to his advantage instantly amid battle. Even with just the knowledge of how to hold a sword properly and go into a stance, he was able to instantly overpower a trained sword instructor, causing him to go unconscious and cause many injuries all over his body. His unique intellect brought about the "Golden Age of the Demon Slayers" as he invented the Breathing Styles and he was able to modify the original Breathing Technique to suit the abilities of others by adapting them to their individual strengths. Furthermore, he was able to surmise that Muzan's weaknesses were his 12 organs and he could create an entirely new technique in that split second to overwhelm him) 
Weaknesses: None notable.
Notable Attacks and Techniques:
*: Created by Yoriichi, Sun Breathing is a Breathing Style that mimics the sun using the user's movements, techniques and abilities. This Breathing Style allows for stronger attacks and makes it feel as if opponents were slashed with fire, drastically slowing down a demon's regenerative healing factor (Demons capable of regenerating limbs at subsonic speeds could barely heal from it). There are 12 known forms created by Yoriichi and later a thirteenth one specifically created to counter Muzan Kibutsuji.
** - The user delivers a single high-powered vertical slash.
** - The user spins their body horizontally to deliver a 360° slash.
** - The user unleashes two horizontal slashes to hit or defend from incoming attacks.
** - The user unleashes a large circular slash that defends from imminent frontal attacks.
** - The user backflips into the air to deliver a powerful upended sword slash that aims to decapitate their target.
** - The user charges towards the target, unleashing a horizontal slash seemingly covered in haze that fails to land, but actually does hit the target.
** - The user spirals into the air and delivers a powerful slash that surrounds the enemy.
** - The user unleashes a single thrust attack with the point of the blade.
** - The user unleashes a continuous fast and powerful sword attack that seemingly takes the form of a Japanese dragon made of solar flames. This technique is capable of decapitating multiple targets at once.
** - The user leaps behind the opponent and spins in the air downward, releasing a sword attack in a circular motion.
** - The user performs high-speed twists and rotations, thus creating afterimages used mostly to evade attacks. The afterimages work most effectively on enemies with good vision.
** - A two-combo strike which starts with a vertical slash and then a horizontal one right after.
** - The user continuously performs all twelve forms of the Sun Breathing in repetitive succession to increase the accuracy and agility of his movements while reducing fatigue. This form was created solely for killing Muzan Kibutsuji, since the repetition of all twelve forms aims to destroy Muzan's twelve vital organs (seven hearts and five brains) that move freely inside his body.
*: Yoriichi has access to the Transparent World since birth, and could use it with surprising proficiency, evident when he could watch for lung expansions and muscle contractions within a person and surmise when to strike them. This ability also granted him an advantage against Muzan, allowing him to find his weaknesses instantly and overwhelm him.
* or the Realm of the Highest/Domain of Supremacy is a mysterious state of being associated with the Transparent World and is implied to be the zenith of physical combat. In this state, his fighting spirit, emotions, and intent are impossible to detect.
==Notable Matchups==
Victories:
Losses:
Inconclusive:
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