Tanjiro Kamado

Tanjirou 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
Tanjirou 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
Tanjirou 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 Tanjirou, and the only remaining member of their family each other has left. As such Tanjirou 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
Tanjirou first met Giyuu after he tried to kill Nezuko who had just been turned into a demon. After seeing his determination Giyuu gives Tanjirou instructions to go to Urokodaki which leads him into the path of becoming a Demon Hunter.

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

History
Tanjirou 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.

One day, after coming home from an overnight trip selling charcoal, Tanjirou returned to find his entire family slaughtered by demons, save for his younger sister Nezuko. After picking Nezuko up and attempting to carry her to the nearest doctor, he discovered that she had been transformed into a demon and was attacked by her. After a brief scuffle, he is able to bring Nezuko to her senses, but must then defend her from Giyuu.

Tanjirou attacks Giyuu by strategically throwing his hatchet, and as Giyuu is distracted, Nezuko escapes and guards the unconscious Tanjirou. Giyuu is stunned by the unconventional duo, and decides to suggest Tanjirou as an apprentice to Urokodaki.

Since then, Tanjirou has sought a way to turn his sister, Nezuko, back into a human as well as vengeance for his slain family.

Natural Abilities
Enhanced Sense of Smell: Tanjirou 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 Tanjirou's was pointed out by Giyuu Tomioka during their first encounter in which Tanjirou skillfully laid out a plan to attack Giyuu by surprise by charging towards him not showing he was unarmed and plan to have brought down Giyuu with an axe he had thrown in the air beforehand.

Enhanced strength: After training, Tanjirou 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 Giyuu. 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. Tanjirou 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,' Tanjirou can utilise ten different moves:
 * 1) First Style: Water Surface Slice (ノ り) - A single concentrated slash
 * 2) Second Style: Water Wheel (ノ) - Tanjirou 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) - Tanjirou 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) - Tanjirou 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) - Tanjirou 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 Tanjirou'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 bloodlust, empowering his opponent with no rust.
 * Waltz - A single concentrated slash.
 * Blue Heaven (の) - A similar attack to "Water Wheel" in which Tanjirou 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 - Tanjirou utilises 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 utilising Nezuko's Blood Burst, Tanjirou'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 - Tanjirou unleashes two horizontal slashes that defend him from attacks from the front or side.
 * Parhelion Rainbow - Tanjirou 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 - Tanjirou 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.