Kyojuro Rengoku

Kyojuro Rengoku was a Demon Hunter and the Flame Pillar of the Demon Killing Corps.

Appearance
Kyojuro was a young adult of tall stature with bright yellow hair with red streaks, black forked eyebrows, and golden eyes.

His outfit consisted of the regular Demon Hunter uniform along with a white-yellow gradient pattern and red flame-like ridges at the end.

Personality
Kyojuro was greatly enthusiastic in regard to his duties as a Pillar and often cheerfully eccentric. He was amiable, kind and boasted extraordinary technique and swordsmanship stemming from strict practice and discipline. He was an honorable warrior who adhered to his code of morals and principles that was instilled into him by his mother at a young age - the most significant being that those who were born strong have a duty to protect the weak.

History
Kyojuro is the eldest son of Shinjurou. His father was known as the Flame Pillar of the Demon Killing Corps until his unexpected retirement.

During the Demon Train Arc, it is revealed that Kyojuro has a younger brother who trained alongside him until their father ceased to teach them. His strength is displayed when he defends over 200 people from being slaughtered by the demons. He comes face to face with the Third Upper Moon, Akaza, and battles him head on but is fatally wounded and succumbs to his injuries.

Natagumo Mountain Arc
Kyojuro was present with his fellow Pillars when Kamado Tanjirou awoke.

Functional Recovery Training Arc
Kocho Shinobu noted that Tanjiro was on trial, which Kyojuro saw no need for, as the youth's protecting of a Demon was a clear violation of conduct, a matter he stated they could deal with themselves. He then agreed with Himejima Gyoumei's idea to kill Kamado Nezuko, witnessing shortly afterward Tanjiro's coughing fit, and remained silent when Kanroji Mitsuri asked if they should be dealing with their subordinate's trial without Oyakata-sama's input. After Tanjiro headbutted Shinazugawa Sanemi, Kyojuro looked at Mitsuri when she laughed with a neutral expression.

Natural abilities
Enhanced strength: Kyojuro possessed great hand and arm strength that was described as "Unbelievable" by Akaza despite the fact he was gravely injured during that time.

Enhanced speed: Kyojuro could move at high speeds that even a trained Demon Hunter like Tanjiro couldn't see or follow and could even cause tremors with it.

Swordsmanship
Breath of Flames (の)
 * 1) First Style: Sea of Fire (ノ) - Kyojuro charges towards his opponent at high speed and decapitates them in one or multiple slashes. This technique had enough force to launch train carriages off the tracks a short distance.
 * 2) Second Style: Ascending Blazing Sky (ノ り) - An ascending slash. Rengoku used this technique to slice Akaza's arm in half.
 * 3) Third Style:
 * 4) Fourth Style: Wave of Blazing Flames (ノ のうねり) - Kyojuro spins his sword in a circular motion, deflecting his enemies attacks.
 * 5) Fifth Style: Flame Tiger (ノ) - A series on sword slashes that take on the form of a tiger. Rengoku used this technique to contest Akaza's War Style.
 * 6) Sixth Style:
 * 7) Seventh Style:
 * 8) Eighth Style:
 * 9) Esoterica: Ninth Style: Purgatory (ノ) - A devastating dashing slash that Rengoku 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".

Trivia

 * Kyojuro was ranked in 7th place as of the first character popularity poll with 1,021 votes.