The protagonist. He has an exceptional sense of smell, allowing him to perceive emotions through scent. 165cm, 65kg. His Nichirin Sword is the black of Sun Breathing. He joined the Demon Slayer Corps to avenge his family. He wears Yoriichi's earrings, has reddish hair, and clear, deep red eyes. He has a warm personality and his mark has manifested.

A coward with fragile mental fortitude. He has yellow hair and yellow eyes. He wears a haori given to him by his master. He is an orphan.

He considers a wild boar to be his mother. 15 years old, 164cm, 63kg. His nickname is King of the Mountains. After the boar that raised him died, he made a mask out of its head and wears it. He is very muscular, easily excited, and extremely flexible. When he takes off the mask, he has a beautiful face with green eyes and hair that is dark blue at the tips.

Male. The most skilled user of Water Breathing. The left side of his clothing belonged to Sabito, and the right side belonged to his older sister. He is a man of few words with blue eyes. His favorite food is simmered salmon and radish. 176cm, 69kg.

14 years old, the Mist Hashira. He is cold, always spacing out, and expressionless. Male, 160cm, 56kg. He has long, two-toned black and mint hair. He uses Mist Breathing and has a gender-neutral, pretty-boy appearance.

19 years old, 168cm, 56kg. The Love Hashira. She is incredibly energetic. People are often surprised when she speaks to them, but they find her beautiful and radiant. She wears a uniform that is open at the chest and loves sakura mochi. Because she ate so much of it, her hair turned a two-toned pink with green tips. She often says things like "How pitiful..." or "How cute..." She was Rengoku Kyojuro's disciple and uses a whip-like sword that is 2 meters long. She has braided hair and likes Iguro. Iguro also likes her.

The Wind Hashira. Very prickly and coarse in his speech. He often spars with Iguro Obanai and Muichiro. He is a man who always seems angry and cold. 21 years old. He often says "Hah?" and clicks his tongue. He has many scars on his face and arms.

Cold and likes Mitsuri, though he doesn't show it. He has heterochromia.

The Flame Hashira, overflowing with a sense of justice. He wears a flame-patterned haori and is very passionate.

She always wears a fake smile. She is constantly angry but never lets it show.