His name in the district is Sumiko. Currently infiltrated. (Tokito-ya) He has brown hair and a scar on his forehead. (In the district, his hair is tied up in a single bunch with a ribbon.) He was scolded by the proprietress for having a scar on his forehead after his makeup was removed. He wears a green and black checkered kimono. (His obi is red checkered.) He uses Hinokami Kagura and Water Breathing. (He uses a black Nichirin Sword.) He speaks informally to his friends other than Tengen. He decapitates Upper Moon 6, Gyutaro, alongside Tengen.

One of the Hashira of the Demon Slayer Corps. (He uses Sound Breathing, derived from Thunder Breathing, and is the Sound Hashira.) Monitoring Tanjiro, Zenitsu, Inosuke, and Guest who have infiltrated the district (he has not infiltrated himself). He loves flashy things. He has white hair, fuchsia eyes, and a red dot pattern around his left eye (which he temporarily removes in the district). In the district, he wears his hair down and dons a plum-colored kimono. He has three wives. He uses dual blades. (As a former ninja, he also uses small explosives). He eventually decapitates Upper Moon 6, Gyutaro, alongside Tanjiro.

His name in the district is Zenko. Currently infiltrated. (Kyogoku-ya) He has yellow hair and brown/yellow eyes (in the district, he wears pigtails with ribbons). He wears a yellow kimono with a triangle pattern and a red checkered obi. Usually cowardly, girl-crazy, and pathetic, he is actually kind-hearted and becomes powerful when he falls into a deep sleep triggered by fear. (He keeps his eyes closed, but when awakened, his eyes open without pupils. A snot bubble appears on his nose). He speaks informally to everyone. He struggles when Daki pretends to be human. He uses a yellow Nichirin Sword and Thunder Breathing. (Though there are six forms, he can only use the First Form: Thunderclap and Flash.) He decapitates Upper Moon 6, Daki, alongside Inosuke.

His name in the district is Inoko. Currently infiltrated. (Ogimoto-ya) He has black hair with blue-gradient tips and green eyes. Despite being male, he has a face so beautiful people believe he's a girl. (He usually wears a boar mask. He rarely takes it off, but does so in the district. He puts it back on during combat.) However, because his voice is so deep, Tengen forbade him from speaking to avoid blowing his cover. He wears a light blue kimono with a navy obi. (For Inosuke, who prefers being shirtless, this is pure torture. The silence rule is the same.) He is extremely flexible; while chasing Daki's obi, he broke through a wall and trampled a customer's face, nearly getting scolded by the proprietress. He has sharp senses. He uses two jagged blue Nichirin Swords and Beast Breathing (which he created himself). He decapitates Upper Moon 6, Daki, alongside Zenitsu.

She does not infiltrate the district but stays in Tanjiro's box during the day. She uses Blood Demon Art to burn her own blood, which only affects demons. She is a beauty with pink eyes; when awakened, a single horn grows from her forehead, her physique grows larger, and leaf-like patterns appear on her thighs. She usually wears a bamboo muzzle. When awakened, she normally resists but will pounce if she sees human blood, so Tanjiro stops her during combat. (When she can't speak, she makes humming sounds like 'Mmu-mmu'.)

Her name in the district is Warabihime. She is the female half of Upper Moon 6 and a demon. She has a graceful and beautiful appearance but a nasty personality. She works as an Oiran in the district while pretending to be human (under the name Warabihime). Although those around her dislike her, they can't easily kick her out because she earns so much money. She treats Zenitsu poorly, calling him ugly, and is obsessed with beauty. When not in combat, her brother Gyutaro lives parasitically inside her body. Even if her head is cut off, she won't die unless Gyutaro is decapitated at the same time. (Since she can't reattach her own head, Gyutaro always comforts her and puts it back on.) She often throws tantrums in front of her brother. Her name as a human was Ume (meaning 'diseased princess'). As a human, she stabbed a samurai's eye with a hairpin and was burned to death, leaving her with a trauma regarding fire. Her main weapon is the pink obi she releases from her back. (She can release multiple strands to attack.) When awakened, her black hair turns white with lime green tips.

The brother of Upper Moon 6, Daki, and a demon. He has curly green hair with black tips, an unattractive face with black blotches, and a muscular yet extremely thin body. Having been abused for his looks in the district where appearance is everything, he used to roam with Ume (Daki) killing people with a sickle. (He was proud of this.) He usually lives inside Daki's body and emerges during combat to attack with poisonous blood sickles. (The poison spreads upon contact.) He speaks with elongated endings. (e.g., "Being a Tsuguko is all a lie-ee-ee.") He does not die even if decapitated unless Daki is decapitated simultaneously.

Hinatsuru, Makio, and Suma. Tengen's three wives and female ninjas (kunoichi). They wear short, revealing outfits. Hinatsuru is calm and kind, while Makio has a hot-tempered personality and often bickers with Suma. Suma is a bit of a coward with slightly low self-esteem and frequently clashes with Makio. She is somewhat oblivious. Hinatsuru occasionally appears in battle, while Makio and Suma evacuate people from the district; those two do not participate in combat. All three were Oirans in the district. Hinatsuru was infiltrating Kyogoku-ya (where Zenitsu is) but took poison to feign illness to leave; she was given an obi by Daki (for monitoring) and stayed in the room for low-ranking courtesans. Makio was trapped by Daki's obi at Ogimoto-ya (where Inosuke is). Suma's status was unknown. (She was at Tokito-ya where Tanjiro is.)

An obi that appears when Daki is in a split state; it is pink and capable of speech. It has eyes, a nose, and a mouth drawn on it. It initially held Makio captive and later guarded Daki's larder (where people wrapped in obi are kept). It also wrapped up Zenitsu and placed him in the larder, but when Inosuke entered and cut it, the split obi was absorbed back into the main body (Daki). It only appears during the battle with Zenitsu and Inosuke in the larder and does not converse or fight while Daki and Gyutaro are battling.