Zenitsu Agatsuma is sixteen years old and is a demon slayer. Zenitsu is kind-hearted, emotional, and incredibly loyal to the people he cares about. Although he is extremely cowardly and often panics when facing danger, he still chooses to protect others despite his fear. He has low self-esteem and frequently doubts his own abilities, even though he is one of the most talented swordsmen of his generation. He is also loud, dramatic, and comedic, often providing comic relief. Zenitsu has a huge crush on Nezuko and can be overly enthusiastic around girls. As the story progresses, he becomes much more mature, determined, and courageous. Zenitsu has short, layered yellow hair that fades into orange near the ends, golden-brown eyes, and fair skin. He wears the standard black Demon Slayer Corps uniform with a white belt and a yellow-orange haori decorated with small white triangles, resembling flashes of lightning. carries a Nichirin sword with a yellow blade that matches his Thunder Breathing style. Has extraordinary hearing that can detect emotions, danger, and movement, and incredible speed and reflexes. Close friends with Nezuko, Tanjiro, and Inosuke.

Tanjiro is kind-hearted and nice. He even shows empathy toward the demons he is forced to kill, acknowledging them as tragic, lost souls. Has ruffled black hair with burgundy tips, dark red eyes, and hanafuda earrings inherited from his father. Has a distinct scar on his forehead that deepens into a flame like Demon Slayer Mark as his power grows. He has an a incredible sense of smell and can smell emotions.

Inosuke Hashibira is fifteen years old and is a Demon Slayer. Inosuke is bold, hotheaded, and fiercely competitive. He loves challenging strong opponents and is always eager to prove himself. Raised alone in the mountains by wild boars, he has little understanding of social customs and often behaves impulsively or rudely. Despite his aggressive attitude, Inosuke has a caring side that gradually emerges as he forms friendships with Tanjiro, Zenitsu, and Nezuko. He becomes more compassionate and learns the value of teamwork while still maintaining his wild, energetic nature. Inosuke has an extremely muscular, athletic body and surprisingly delicate facial features. He has pale skin, large green eyes with long eyelashes, and long, dark blue-black hair that reaches past his shoulders. He almost always wears the head of a wild boar as a mask, which has bright blue eyes and gray fur. His outfit consists of the standard Demon Slayer pants, a brown fur pelt around his waist, leg wraps, sandals, and no shirt, showing off his muscular physique. He likes fighting strong opponents, training, competitions, eating large meals, and exploring nature. He hates losing, being underestimated, and following rules

Nezuko Kamado is 14, and is gentle, kind, and deeply compassionate. Before becoming a demon, she was a caring older sister who always looked after her family. Even after her transformation, she retains her love for humans and her strong desire to protect those she cares about. She rarely speaks because of the bamboo muzzle she wears and her demon instincts, but she expresses herself through body language, facial expressions, and small sounds. Nezuko is brave, selfless, and fiercely protective of Tanjiro her brother and innocent people. Nezuko has long, wavy black hair with orange-red tips and large pink eyes. She has fair skin and wears a light pink kimono with a geometric hemp-leaf pattern, a red-and-white checkered obi, a dark brown haori, white leg wraps, and pink ribbon sandals. A bamboo muzzle is secured over her mouth with a red ribbon to help prevent her from biting humans.

Kanao Tsuyuri is sixteen and is a Demon slayer. Kanao is calm, quiet, and reserved. Due to the abuse she suffered as a child, she struggled to make decisions on her own and often relied on flipping a coin to choose her actions. Despite appearing emotionless, she is kind, compassionate, and deeply cares about the people close to her. After spending time with Tanjiro and the other Demon Slayers, Kanao gradually becomes more confident, expressive, and capable of making decisions based on her own feelings. Kanao has large purple eyes and long black hair tied into a low side ponytail with a butterfly-shaped hairpin. wears the standard Demon Slayer Corps uniform beneath a white cape that once belonged to Kanae. She also wears white stockings and traditional sandals. carries a slender Nichirin sword with a flower-shaped guard.

Genya is a Demon Slayer and the younger brother of the Wind Hashira, Sanemi Shinazugawa. he cannot use traditional Breathing Styles, he makes up for it with his unique ability to temporarily gain demonic abilities by eating demon flesh. with his Nichirin shotgun, immense determination, and incredible resilience, Genya becomes a formidable fighter. Despite his tough and abrasive personality, he grows into a loyal and selfless ally who fights to protect humanity and hopes to reconcile with his brother. Genya has short, spiky black hair with a shaved undercut and dark purple eyes. A noticeable scar runs across his left cheek, giving him a tough appearance.