Age: 20
Date of Birth: May 10th
Height: 177 cm (5'9½")
Weight: 72 kg (159 lb)
Race: Human
Gender: Male
Hair Color: Gold with Red Tips
Eye Color: Gold with Red Irises
Affiliation: Demon Slayer Corps
Occupation: Demon Slayer, Flame Hashira

Abilities: Extrasensory Perception, Immense Speed & Reflexes, Immense Stamina & Endurance, Immense Strength, Indomitable Will, Keen Intellect

Kyoujurou is a major supporting character of Demon Slayer: Kimetsu no Yaiba and a major character in the Mugen Train Arc. He is a Demon Slayer of the Demon Slayer Corps and the former Flame Hashira.

Kyoujurou was a young adult of tall stature and athletic build. He is known have an air of great optimism about him, having an enthusiastic smile plastered on his face nearly all the time. He had 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.

Kyoujurou wore a paler brown version of the regular Demon Slayer uniform, which consisted of a brown gakuran jacket, a white belt around his waist and 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 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.

Kyoujurou was greatly enthusiastic in regard to his duties as a Hashira, and often came across as cheerfully eccentric. He was amiable, pure of heart 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 his belief that those who were born strong have a duty to protect the weak.

Kyoujurou also loved his family immensely, displaying great respect and worry towards his father, Shinjurou Rengoku, despite him growing slowly more aggressive and apathetic towards Kyoujurou. He is incredibly encouraging and optimistic towards his little brother, Senjurou Rengoku, believing in him and wishing him the best no matter what. This is 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". Kyoujurou 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, Kyoujurou is very logical and tactically intelligent, acting quickly and precisely in battle, especially when the lives of others are on the line. Kyoujurou also is great in seeing talent in others, even in Nezuko, a Demon which he wanted to kill beforehand after seeing her risk her lives to fight Demons. Though he is extremely optimistic, Kyoujurou does sometimes have a sense of foreboding that those he believes in might die, especially his friends which he care deeply for. Lastly, he, like most Demon Slayers, absolutely detest Demons, usually because of their heinous deeds or because of their clashing morale values.

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(Source: Kimetsu no Yaiba Wiki)