Tanjiro Kamado

Tanjiro Kamado is the main protagonist of Kimetsu no Yaiba, who becomes a Demon Hunter and joins the Demon Killing Corps to hunt down the Demon who murdered his family and turned his sister Nezuko into a Demon.

Appearance
Tanjiro has burgundy hair combed back and dark eyes with a scar on the top left of his forehead. He wears long rectangular earrings with a sun symbol and a checkered black and green pattern haori over the standard Demon Hunter uniform.

He carries around a wooden box where Nezuko sleeps during the day.

Personality
Tanjiro is kind by nature and has been described by others as having very gentle eyes. He has a great deal of determination and will not give up once he has a goal to achieve; an example is finding a cure for Nezuko. Even though he is relatively strong on his own, he isn't opposed to asking others for help when he needs it. He is very protective of his friends and even more so of his younger sister. His most important attribute is his ability to empathise with anyone, even demons. This often gives him hesitation when killing demons.

For the years of his service and amount of experience he faced, he became more calculating and strict in his decision. His courage to protect the weak committed him to face his enemy with respect and dignity whether good or evil demons.

Nezuko Kamado
Nezuko is the younger sister of Tanjiro, and the only remaining member of their family each other has left. As such Tanjiro who is usually calm and polite will become enraged and attack anybody who harms Nezuko. He is extremely protective of her, but that doesn't prevent him from getting her help during battles that he can't handle alone.

Tomioka Giyuu
Tanjiro first met Giyuu after he tried to kill Nezuko who had just been turned into a demon. After seeing his determination Giyuu gives Tanjiro instructions to go to Urokodaki which leads him into the path of becoming a Demon Hunter.

While not trusting him at first, Tanjiro comes to respect Giyu a lot later on. They are both students of Urokodaki and users of the Breath of Water Style.

History
Tanjiro grew up on a mountain alongside and the rest of his siblings and mother. He is the eldest son of the Kamado family. He was very loving towards his brothers and sisters, and would go out of his way to play with and console them. He was admired by all of his siblings. He was responsible for things like selling firewood in the nearest town in order to earn money for the family.

Final Selection Arc
During the Taisho Period. Tanjiro Kamado is living a modest but blissful life in the mountains with his family.

After coming home from an overnight trip selling charcoal, Tanjiro returns to find his entire family slaughtered by demons, save for his younger sister Nezuko. Tanjiro picks Nezuko up and attempting to carry her to the nearest doctor, he discovers that she has been transformed into a demon and is attacked by her.

While Tanjiro is struggling to fend off the attack from his Demon-turned sister Nezuko, Giyu attackes the latter from behind, only for his attempt to fail as the former moves his target out of the way. Recovering quickly, the swordsman asks the youth why he protects the Demon. Tanjiro tells him it is because the creature is his sister. Looking at the maddened Nezuko, Giyu questions this statement, before swiftly removing the girl from her brother's grip.

As Tanjiro called out to his sister in alarm, Giyu told him not to move, stating that it is his job to kill Demons like Nezuko. The swordsman then listens to Tanjiro's attempt to defend his sister and explain their current predicament, commenting that her change in demeanor is simple to explain: any open wound bathed in Demon blood causes that person to become a Demon themselves, thus increasing their overall numbers. Tanjiro exclaims that his sister hasn't eaten any people, Giyu reminds him of what had just transpired, shortly thereafter bluntly commenting that there is no way to cure a person once they are turned into a Demon, despite Tanjiro's plea to the contrary. As Tanjiro continues pleading, Giyu brought his sword up to Nezuko's throat.

Tanjiro then prostrates himself before the swordsman, begging for his sister's life, Giyu grew angry, stating that the youth has no authority over who lives or who dies, as he was too weak to protect his family, and that all of his talk about finding a cure for his sister's condition and finding his family's killer is ridiculous. Stating that neither he or the Demon Lords would have any respect for such a miserable display, Giyu demands that Tanjiro prove his dedication to protecting his sister by drawing his axe. As the youth pondered these words, Giyuu silently encourages him to find the resolve necessary to accomplish all of the lofty goals he had placed upon himself. He then stabs Nezuko in the chest, causing Tanjiro to throw a stone at him in fury.

Giyu blocks the stone with the hilt of his sword, avoiding another of the projectiles as Tanjiro charged at him empty-handed. Seeing the attack attempt as only a simple act of emotion, the swordsman angrily drove the hilt of his sword into his attacker's back, knocking him to the ground. Staring down at the fallen youth, Giyu wonders where his opponent's axe was. Looking up, he sees the weapon spinning towards him through the air, and narrowly dodges it. He then mused over Tanjiro's clever strategy, realizing that the youth's plan had been to take him out even though he would have perished as well.

Distracted, the swordsman is attacked by Nezuko, dodging backward from her kick. Cursing himself, Giyu watches as the girl reached for her brother, certain that she was going to devour him. To his surprise, she instead stood protectively in front of his prone body, before charging at him in rage. Giyu recalled Tanjiro's previous assertion that Nezuko wouldn't eat humans, noting that somebody a long time ago had said the same thing and had been killed regardless. He further reflected on the nature of Demons, in particular, the high amount of stamina lost during the transformation process, and what they do to alleviate the lost stamina and prevent starvation: eat humans, even those closest to them. Seeing that Nezuko was not following this example, Giyu sheathed his sword, incapacitating the unusual Demon with a barehanded blow to the neck.

While Tanjiro and Nezuko were unconscious, Giyu wraps the latter in a clean cloth and straps a bamboo muzzle-like tube across her mouth. When Tanjiro regained consciousness, the swordsman instructed him to visit Urokodaki Sakonji, and also to not take his sister out in the sun, before leaving swiftly.

Natural Abilities
Enhanced Sense of Smell: Tanjiro has a heightened sense of smell even before he underwent sword training. It is strong enough for him to smell the 'line of interval'-- the slight pause in an enemy's movement-- and distinguish between species, as well as their approximate position. After training, he can smell emotions as well as track objects, humans and demons over long distances.

Fighting ability: This trait of Tanjiro's was pointed out by Giyuu Tomioka during their first encounter in which Tanjiro skillfully laid out a plan to attack Giyu by surprise by charging towards him not showing he was unarmed and plan to have brought down Giyu with an axe he had thrown in the air beforehand.

Enhanced strength: After training, Tanjiro gained immense strength and speed and has demonstrated a great use of it (i.e., Jumping over twice his height during the Final Selection arc when fighting the Demon who killed Urokodaki Sakonji's disciples.

Swordsmanship
Breath of Water Style (の) : Taught to him by Urokodaki Sakonji, the Water Pillar before Giyu. The user can increase the amount of oxygen in one's blood by controlling his breathing pattern. This increases his strength and agility to equal a demon's. Tanjiro has now learned to do full focus breaths at all times, further increasing his base strength, speed, and stamina. With this enhanced strength and ability to find the 'line of interval,' Tanjiro can utilize ten different moves:
 * 1) First Style: Water Surface Slice (ノ り) - A single concentrated slash
 * 2) Second Style: Water Wheel (ノ) - Tanjiro jumps and spins his body while slashing.
 * 3) * Second Style Modified: Horizontal Water Wheel (ノ・) -
 * 4) Third Style: Dance of the Rapid Current (ノ い) - Tanjiro swings his blade at his opponent in a way that mimics the movement of waves on the surface of water.
 * 5) Fourth Style: Striking Tide (ノ ち)
 * 6) Fifth Style: The Merciful Rain of a Dry Day (ノ の) - A "sword strike of kindness" that kills the target with little to no pain. Used when the enemy surrenders.
 * 7) Sixth Style: Twisting Whirpool (ノ ねじれ) - Tanjiro fiercely twists his upper and lower body, which creates a whirlpool that cuts anything caught in it.
 * 8) * Sixth Style: Twisting Whirpool - Current (ノ ねじれ・) -
 * 9) Seventh Style: Piercing Rain Drop - A fast and accurate stab. The fastest Breath of Water technique.
 * 10) *Seventh Style: Piercing Rain Drop - Curve (ノ き・) -
 * 11) Eight Style: Waterfall Jar (ノ) - Tanjiro cuts the target vertically.
 * 12) Ninth Style: Water Splash (ノ)
 * 13) * Ninth Style: Water Splash - Chaos (ノ ・) - Minimizes the landing time and surface needed when landing, allowing the user to move without limits. Ideal when fighting in a place with no solid foothold.
 * 14) Tenth Style: The Dragon of Change (ノ) - A constant attack that increases in power with each rotation, creating a strong slash.

Dance of the Fire God (ヒノカミ): Taught by Tanjiro's father. A breathing technique that increases the user's strength and endurance. Ability to See-Through - Like his father, he finally gained the ability to foresee the opponent's attack while showing no battle spirit and sense of blood-lust, empowering his opponent with no rust.
 * Waltz - A single concentrated slash.
 * Blue Heaven (の) - A similar attack to "Water Wheel" in which Tanjiro spins his body to create a 360-degree slash.
 * Flame Waltz - A two-combo strike which starts with a vertical slash and then a horizontal one right after.
 * Waltz Flash - Tanjiro utilizes Zenitsu Agatsuma's "Thunderclap flash" and combines it with his "Flame Waltz" by pumping air through his entire body, focusing it on the legs, and releasing it all and ending with a flaming slash.
 * Solar Halo Dragon Dance - A combination attack utilizing Nezuko's Blood Burst, Tanjiro's sword adopts a red colour and is coated in flames. While in this state, he circles the enemy in a pattern resembling a flaming dragon and slashes them multiple times and ultimately beheading them. He first used this on Urogi, Sekido, and Karaku.
 * Scorching Crimson Mirror - Tanjiro unleashes two horizontal slashes that defend him from attacks from the front or side.
 * Parhelion Rainbow - Tanjiro uses this technique to evade techniques using high-speed twists and rotations. It works most effectively on enemies with good vision as they will attack an afterimage of him and not his actual body.
 * Fire Chariot - Tanjiro uses this technique in quick succession with Parhelion Rainbow and attacks the enemy while they are distracted.
 * Shining Sun Stab - A single thrust attack with the sharp blade.
 * Burning Sun - A circular slash that defends from imminent frontal attacks.

Trivia

 * Kamado, without the second kanji (竈, かまど) is a traditional Japanese wood or charcoal-fueled cook stove/furnace.
 * Do, the second kanji of his family name, (門, ど) means door.
 * Tan (炭, たん) means charcoal.
 * Ji (治, じ) can mean 'to heal'.
 * Rou (郎, ろう) is a common Japanese name suffix for boys. It also means male.