Kyojuro Rengoku was a major supporting character of Demon Slayer: Kimetsu no Yaiba and a major character in the Mugen Train Arc. He was a Demon Slayer of the Demon Slayer Corps and the late Flame Hashira.

Fighting Style

As he was a Hashira of the Demon Slayer Corps, Kyojuro was one of the most powerful and skilled swordsmen in the entire organization. Additionally, Kyojuro is part of the Rengoku family which has an impressive lineage of powerful swordsmen and Flame Hashira, giving Kyojuro an edge in developing and polishing his swordsmanship. His extraordinary swordsmanship skill has been displayed on multiple occasions across the series.

In his battle against the former Lower Rank Two, Hairo, Kyojuro was able to out-wield the demon's bushido sword style, which Hairo appraised as he was decapitated. Kyojuro's precise blade work could also slow down Enmu in his fused form, which gave him the opportunity to explain his plan to Tanjiro and Inosuke. His mastery of the blade is best showcased during his battle with Akaza, in which he was more than capable of fighting on equal ground with the Upper Rank who has killed countless Demon Slayers and even Hashira over the last century, even to the point that Akaza constantly praised Kyojuro's swordsmanship.

Breathing Style

Flame Breathing: A Breathing Style taught to Kyojuro by the previous Flame Hashira, Shinjuro Rengoku, and later mastered by reading the instruction books left behind by previous Flame Hashira in the Rengoku Family. As the Flame Hashira, Kyojuro is his generation's most skilled Flame Breathing user. He became evidently proficient in fighting with this Breathing Style, being able to singlehandedly defeat former Lower Rank Two, Hairo and later hold his own against Upper Rank Three, Akaza.

Techniques

• First Form: Unknowing Fire - The user charges towards their target at high speeds and unleashes a singular slash that aims to decapitate them.
• Second Form: Rising Scorching Sun - The user releases an arching sword slash upwards.
• Third Form: Blazing Universe - The user swings their blade downwards in an arc.
• Fourth Form: Blooming Flame Undulation - The user swings their blade in a circular motion that is used to defend from incoming attacks or slash multiple targets in one swoop.
• Fifth Form: Flame Tiger - The user performs a series of powerful sword slashes that seemingly takes the form of a flaming tiger.
• Ninth Form: Rengoku - The most powerful Flame Breathing technique. The user takes a high stance with their sword before dashing forward at high speeds. The technique is powerful enough to completely carve out the ground in its wake. In the movie and anime adaptation, this technique seemingly took the form of a flaming Japanese dragon that envelopes the user as they are charging towards the target.

Standard Nichirin Katana: Kyojuro carried a standard sized and shaped katana made from scarlet ore that is a deep shade of reddish-orange in color with the words Destroyer of Demons engraved on the side. There is also a noticeable flame pattern on each side of his katana with a white handle. Kyojuro's sword tsuba is shaped like a flame with a red core and orange border. He also carried a standard sword sheath that was white and grey in color.