Rengoku Senjurou

Senjurou's younger brother. He resembles his father and brother but has eyebrows shaped like the number eight. He is gentle and polite, but also somewhat timid and reserved.

Originally, he was supposed to succeed as the Flame Hashira, but lacking in swordsmanship talent, he gave up the path of a swordsman and decided to find his own way to be useful to others.

He gave Tanjirou the guard of his brother's Nichirin Sword after recounting his brother's last words and will. He continues to correspond with Tanjirou through letters.