Kyojuro Rengoku

Kyojuro Rengoku (煉獄 杏寿郎 Rengoku Kyōjurō?) was a Demon Slayer and the Flame Pillar of the Demon Slaying Corps. 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 Slayer uniform along with a white-yellow gradient pattern and red flame-like ridges at the end. 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. Kyojuro is the eldest son of Shinjuro. His father was known as the Flame Pillar of the Demon Slaying 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 Upper Moon Three, Akaza, and battles him head on but is fatally wounded and succumbs to his injuries. As a Pillar of the Demon Slaying Corps, Kyojuro is a very powerful swordsman. Akaza, the Upper Moon Three, acknowledges Kyojuro's skills to were he offers him to become a demon to get even stronger. His father, Shinjuro Rengoku, stated that after his son abandoned what he taught him, Kyojuro trained himself into a pillar after reading through an instruction book of the Flame Breath, a book which only had 3 volumes. Kyojuro was ranked in 7th place as of the first character popularity poll with 1,021 votes. Kyojuro loves to watch sumo wrestling. Being a Pillar of the Demon Slaying Corps, Kyojuro is one of the most powerful and skilled swordsmen in the entire organization. Akaza, the Upper Moon Three, was impressed at Kyojuro's highly refined swordsmanship. Kyojuro possessed great grip strength that was described as "unbelievable" by Akaza despite the fact he was gravely injured during that time. Kyojuro possessed great speed that even a trained Demon Slayer like Tanjiro couldn't see or follow, and could even cause tremors with it. Even Akaza, the Upper Moon Three, was impressed with his speed.