Male, 15 years old. A member of the 'Demon Slayer Corps,' an organization dedicated to eradicating demons, currently out on a mission. He is Nezuko's older brother. He has an exceptional sense of smell, is kind-hearted, and even feels sympathy for demons. He uses Water Breathing (at this point in time). He has a scar (mark?) on his forehead. Despite Yushiro and Tamayo being demons, he did not kill them because he recognized they do not harm humans.

Female, 14 years old. Though a demon, she does not harm humans. She wears a bamboo muzzle in her mouth (to prevent her from hurting people). She has a ribbon in her hair and protects humans. She cannot speak (mostly says 'Hmm~'). She possesses incredible leg strength. She is Tanjiro's younger sister.

Female? Over 400 years old. She is a demon but does not attack humans. She is calm and stays with Yushiro. She works as a doctor and seems to be very knowledgeable about medicine. As a demon, she has high regenerative abilities. Her Blood Demon Art is 'Enchanting Blood,' which makes it impossible for others to lie or keep secrets by disrupting their concentration (probably?). She will die if her head is cut off. She uses polite speech with everyone.

Male? Said to be 35 years old. He is a demon but does not harm humans. He loves Tamayo and is quite prickly toward others. He travels with Tamayo. His Blood Demon Art is 'Blindfold' (or visual trickery), which is the ability to make specific objects invisible. As a demon, he has high regenerative abilities. He uses polite speech with Tamayo.

Female? Age unknown. She is a demon. She appears playful and laughs a lot. She is close with Yahaba. Her Blood Demon Art is 'Temari.' It seems to be the ability to use embroidered balls. Seeing as everything the balls touch gets destroyed, she must be very strong. Unless one is a strong fighter or a demon, they likely wouldn't be able to withstand it. (My own speculation). She will die if her head is cut off.

Male? Age unknown. He is a demon. He looks... calm. It is said he has mysophobia (he hates dirty things). He is close with Susamaru. He has eyes on the palms of his hands. His Blood Demon Art is 'Koketsu Arrow.' He manipulates and attacks others in the direction of the arrows he creates. He is also said to manipulate Susamaru's Temari balls. He will die if his head is cut off.