Kyojuro Rengoku

is a major protagonist in the 2016-2020 action-adventure dark fantasy manga series Demon Slayer: Kimetsu no Yaiba and its 2019 anime television series adaptation. 
He is the deuteragonist of the Mugen Train arc and its 2020 anime movie adaptation of the same name, as well as the titular main protagonist of its spin-off Kyojuro Rengoku: Gaidan, which depicts his time in the Demon Slayer Corps before officially becoming the Flame Hashira.
He was one of the nine Hashira, a group of the nine greatest Demon Slayers in the Demon Slayer Corps. Specifically, Kyojuro was the Flame Hashira who made use of the Flame Breathing. While not having his life being directly affected by demons like many other members in the Corps, The Rengoku household had produced demon hunters for generations. Kyojuro, with his sense of duty instilled by his ailing mother since childhood, saw it as a duty to protect the innocent from Demons and entered the corps to serve humanity. 
During a mission on the Mugen Train, Kyojuro was killed in battle against Akaza, the demon who held the position of Upper Rank Three within the Twelve Kizuki. Despite his death, his influence on Tanjiro still continues to strengthen the boy's determination on ending the Demon race.
==Portrayals==
===Voices===
====Japanese====
* Satoshi Hino
* Mariya Ise (Child)
====English ====
* Mark Whitten
*Ryan Bartley (Child) 
==== Spanish latin ====
* Irwin Daayán (both of them)
===Live Action===
* Hiroshi Yazaki - Stage adaptation
==Appearance==
Kyojuro was a young man with bright yellow hair with red streaks, black-forked eyebrows, and golden eyes. He was fairly tall by Japanese standards and possessed a relatively muscular build.
His Demon Slayer outfit consisted of a brown gakuran jacket, a white belt around his waist and tattsuke-hakama pants. Over this, he wore a haori with a white-yellow gradient pattern and red flame-like ridges at the end that his father Shinjuro Rengoku once worn and more than likely his father worn when they were the Flame Hashira respectively. Finally, he wore red kyahan with yellow flames erupting from the bottom-up, with pale brown tabi socks and a pair of white zōri with red straps.
== Personality==
Kyojuro was greatly enthusiastic in regard to his duties as a Hashira and often cheerfully eccentric. He was incredibly charismatic and generous and was almost always seen with a jovial expression. He boasted extraordinary technique and swordsmanship stemming from strict practice and discipline.
Kyojuro was an honorable warrior who adhered to his code of morals and principles that were instilled into him by his mother during childhood, the most significant being that those who were born strong have a duty to protect the weak. He also loved his family immensely, displaying great respect and worry towards his father, Shinjuro Rengoku, despite him growing slowly more aggressive and apathetic towards Kyojuro. He was incredibly encouraging and optimistic towards his little brother, Senjuro Rengoku, believing in him and wishing him the best no matter what. This was further accentuated during his death where his final words for his father and his little brother were "take care of your body" and "follow your dreams no matter what". Kyojuro also believes that if someone lacks immense skill, their hard work towards their dreams and desire to help people doesn't count for nothing.
Beneath his enthusiastic demeanor, Kyojuro was very logical and tactically intelligent, acting quickly and precisely in battle, especially when the lives of others are on the line. Kyojuro was also great in seeing talent in others, even in Nezuko Kamado, a demon which he wanted to kill beforehand, after seeing her risk her lives to fight and protect others. Though he was extremely optimistic, Kyojuro does sometimes have a sense of foreboding that those he believes in might die, especially his friends which he care deeply for. He, like most Demon Slayers, absolutely detests demons, usually because of their heinous deeds or because of their clashing morale values. Despite this, Kyojuro recognized and accepted Nezuko as a member of the Demon Slayer Corps after seeing her risk her life to protect innocents, showing that Kyojuro was capable of not letting his hatred for demons cloud his judgement.
==Powers and Abilities==
: This technique allowed Kyojuro to increase the amount of oxygen in his blood by controlling his breathing pattern, which increased his strength and agility to equal that of a demon. Kyojuro had learned to do full focus breaths at all times, further increasing his base strength, speed and stamina. By focusing his breathing on specific points, he was capable of stopping bleeding from injuries. There are at least a total of nine styles that can be used with the Breath of Flames, although Kyojuro only displayed five of these, with the other four techniques being unknown.
# - Kyojuro charges towards his opponent at high speed and decapitates them in one or multiple slashes that burns the flesh of his enemy. This technique had enough force to launch the entire Infinity Train off the tracks a short distance.
# - Kyojuro releases an arching slash attack upwards.
# - Kyojuro swings his blade downwards in an arc.
# - Kyojuro spin his sword in a circular motion, deflecting his enemies attacks.
# - A series of sword slashes that took on the form of a tiger. Kyojuro used this technique to contest Akaza's Destructive Death: Disorder.
# - A devastating dashing slash that Kyojuro initiates from a high stance, the technique had enough power to carve a deep impression in the ground where he used it. Before using this technique he remarked to himself about "thoroughly hollowing out most of the area".
== Etymology ==
* The name Kyojuro means "apricot" (杏) (kyo), "longevity, congratulations, one's natural life" (寿) (ju) and "son" (郎) (ro).
* Kyojuro's surname Rengoku means "purgatory" (煉獄).
==Trivia==
*Kyōjurō loved to watch sumo and wrestling.
*Kyōjurō's favorite food was sweet potatoes.
** Kyōjurō's favorite side dish was salt grilled bream.
*Kyōjurō's birthday was on May 10.
**Kyōjurō's zodiac sign was Taurus.
***Kyōjurō was 20 years old at the time of his death.
*At the time of his death, Kyōjurō weighed 72 Kg and was 177 centimeters (5'10") tall.
*Kyōjurō was ranked in 7th place as of the first character popularity poll with 1,021 votes.
*Kyōjurō always wanted a pet, but he has never been able to have one because of his father's hatred toward animals.
*Kyojuro is one of only 4 Hashira that use a standard Nichirin Katana. The other 3 are Giyu Tomioka, Sanemi Shinazugawa and Muichiro Tokito.
*His Japanese voice actor, Satoshi Hino, also voiced Sai in Naruto: Shippuden, Kris in Fire Emblem, Yuji Sakai in Shakugan no Shana, Shiage Hamazura in A Certain Magical Index, Abel Nightroad (Young) in Trinity Blood, Halley Brankett in Shadow Hearts, Takuto Maruki in Persona 5 Royal, Kouichi Aizawa in Nabari no Ou, Saito Hiraga in Zero no Tsukaima, Riken Yoshinokazaru in Otome Yōkai Zakuro, Ryo Sayama in Code Geass: Akito the Exiled, and Leonhart in Sacrificial Princess and the King of Beasts.
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