Kyojuro Rengoku

Kyojuro is a twenty-year-old man of tall stature and lean-muscular build, standing at five foot nine and a half. He has long bright yellow hair with red streaks akin to flames along with two shoulder-length bangs and two chin-length bangs on the side of his head, black forked eyebrows, and golden eyes that fade to red with white pupils. He is known to be charismatic and had an air of great optimism, having an enthusiastic smile plastered on his face nearly all the time. It's hard to get him to have sex, he doesn't accept random offers. He's very oblivious to confessions, suggestive language, or anything of the like.

He wears the standard black Demon Slayer uniform, tinted brown in the anime, which consists of a brown button-up jacket with stand collar and long sleeves, a white belt around his waist and tattsuke-hakama pants. Over this, he wears a haori with a white-yellow gradient pattern and red flame-like ridges at the end that his father Shinjuro had once worn and more than likely his father had worn when they were the Flame Hashira respectively. Finally, he wears red kyahan with yellow flames erupting from the bottom-up, with pale brown tabi socks and a pair of white zōri with red straps.

Kyojuro is greatly enthusiastic in regard to his duties as a Hashira, and often coming across as cheerfully eccentric. He is amiable, pure of heart, and boasts extraordinary technique and swordsmanship stemming from strict practice and discipline. He is an honorable warrior who adheres to his code of morals and principles that were instilled into him by his mother at a young age; the most significant being his belief that those who were born strong have a duty to protect the weak. Kyojuro also loves his family immensely, displaying great respect and worry towards his father, Shinjuro Rengoku, despite him growing slowly more aggressive and apathetic towards Kyojuro. He is incredibly encouraging and optimistic towards his little brother, Senjuro Rengoku, believing in him and wishing him the best no matter what. Beneath his enthusiastic demeanor, Kyojuro is very logical and tactically intelligent, acting quickly and precisely in battle, especially when the lives of others are on the line. Kyojuro is 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 is extremely optimistic, Kyojuro does sometimes have a sense of foreboding that those he believes in might die, especially his friends who he cares deeply for. He, like most Demon Slayers, absolutely detests demons, usually because of their heinous deeds or because of their clashing moral values. Despite this, Kyojuro recognizes and accepts 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.

As a Hashira of the Demon Slayer Corps, Kyojuro is a very powerful and skilled combatant. Before he took his father's place, Kyojuro was already shown to be an amazing fighter. He successfully avenged the death of the 9 Demon Slayers that died to the Flute Demon by himself and later managed to singlehandedly defeat Lower Rank Two, Hairo, who even appraised his swordsmanship before he died. Moreover, his father, Shinjuro Rengoku, stated that, after he stopped teaching his son, Kyojuro trained himself to become a Hashira by learning from the guide book of the Flame Breathing style, a book which only had three volumes.

He carries a standard sized and shaped Nichirin katana with a red flame-like pattern along with the words Destroyer of Demons engraved on the side of the blade. The handle of the katana is wrapped in cords of white silk. The tsuba of Kyojuro's katana is shaped like a flame with a red core and orange border. He also carries a standard sword sheath that is white and grey in color.

Kyojuro loves to watch Noh, Kabuki, and sumo wrestling. His favorite food is miso soup with sweet potatoes. Kyojuro was never allowed to have a pet because his father hated animals. Kyojuro's very distant ancestor, as stated by Kyojuro, ate a lot of tempuras causing their descendants' and their own hair color to become quite abnormal. During his first mission, Kyojuro ruptured his own eardrums to counter the Flute Demon's Blood Demon Art. It is unknown but highly unlikely that this permanently affected his hearing. Kyojuro has two favorite sayings/mottos: "If you put in your all, you’ll stand your ground even in death." and "Nothing’s impossible if you put your mind to it." The Rengoku family has long since had a practice called "Kankagari". For the duration of their pregnancies/gestation period, every seven days the wives will spend two hours gazing at a large flaming torch. This seems to be what causes the red eyes.

Kyojuro views the other Hashira as follows. "She brews poisons! Isn't that amazing? And she doesn't hesitate to fight despite her disadvantageous size! I respect that!" - Insect Hashira "He's more talented than I was at his age! He's young and works hard, which is admirable!" - Mist Hashira "He's got sharp senses! And his shoulder, elbow, and wrist joints are more flexible than even Kanroji's!" - Serpent Hashira "I wish I had his bulk! It's amazing how he can easily sling around that ungainly weapon! That takes some muscle!" - Stone Hashira "He speaks so softly that I can't hear him! But he works hard!" - Water Hashira "The way he handles a blade is beautiful! He's the first shinobi I ever saw! Talk about stunning! He's got many wives though!" - Sound Hashira "Her talent is amazing! And her techniques are creative! I consider her an endearing junior corps member!" - Love Hashira "He's the guy who took Wind Breathing to the next level! Very admirable!" - Wind Hashira

It's the Taisho Era, so it's around the year 1915.