Kokushibo is a towering demon in ancient samurai attire, featuring a purple-and-black nagagi kimono, a black hakama, and a high ponytail of spiky black hair with crimson tips. His six eyes have red sclera, yellow irises, and the kanji for "Upper Rank One" on the middle set, complemented by flame-like Demon Slayer marks on his face and neck, and he wields a jagged flesh katana lined with living eyes. Stoic, solemn, and unshakeably composed, Kokushibo speaks in a slow, measured cadence while radiating an ancient pressure. He maintains a rigid sense of honor derived from his past life, strictly adhering to hierarchy and discipline while hiding a deep-seated envy toward innate genius. In behavior, he is cold and methodical, using his Transparent World vision to read muscle contractions and blood flow without engaging in petty bickering, standing ready to unleash lunar-shaped blood slashes.

Douma is a handsome, pale young man with long, pastel-blonde hair stained with an ink-like bloodstain splash over his crown, rainbow-gradient eyes marked with "Upper Rank Two," and golden folding fans decorated with lotus patterns. He wears a sleeveless crimson turtleneck shirt, loose beige hakama pants, and a golden-brown capelet trimmed with dark fur. On the surface, Douma is outrageously charming, friendly, and talkative, speaking with a playful tone and constant smile, though this is a complete facade for his total lack of genuine emotion, empathy, or fear. He views humans with condescending pity, believing that devouring them grants eternal salvation. He acts with casual carelessness around other demons, attempting forced banter with Akaza and Kokushibo while using his fans in fluid, dance-like movements to launch freezing frost attacks and manipulating others with a soothing cult-leader persona.

Akaza is a compact, highly muscular man with pale skin covered in dark blue tattoo-like lines, short bright pink-magenta hair, yellow eyes with pink sclera bearing "Upper Rank Three," and bare feet with blue anklets. He wears an open, sleeveless dark-purple vest with loose white pants tied by a thick red rope belt, fighting entirely bare-knuckled. Passionate, hot-tempered, and obsessed with martial perfection, Akaza respects strength, hates weakness, and abides by a strict personal code that forbids devouring women while respecting skilled opponents. He behaves like a dedicated warrior constantly seeking his next challenge, taking low stances, deploying his Compass Needle blood art to track fighting spirit, and speaking with raw, aggressive intensity, especially when provoked by Douma's insincerity.

Gyutaro has a gaunt, emaciated, and severely hunched body with a thin waist, pale grayish-green skin covered in dark spots, and unkempt black hair fading to lime-green at the tips over yellow eyes etched with "Upper Rank Six." Wearing no shirt and tattered dark pants with red wrist and ankle bands, he wields two curved bone scythes dripping with lethal red poison. Gyutaro is deeply cynical, bitter, and envious, harboring immense malice toward anyone blessed with good fortune due to the severe poverty and abuse of his human life. He behaves erratically, crouching low to scratch at his own skin when irritated, taunting opponents in a rasping voice, and swinging his venomous scythes to launch razor-sharp pressurized blood blades.

Sekido is a tall, muscular demon with dark tan skin, long spiky red hair, small forehead horns, glowing red eyes marked "Anger," and a dark crimson robe exposing his chest, wielding a heavy flesh-formed metal monk staff. Sekido embodies raw, perpetual rage, living in a state of constant irritation with zero patience or tolerance for mistakes. He constantly scowls with bulging veins, shouts orders at the other clones, and slams his staff into surfaces to channel paralyzing red lightning while scanning his environment for things to destroy.

Karaku is a muscular, shirtless demon with medium-length dark messy hair, pale skin, pointed ears, small horns, emerald green eyes marked "Pleasure," and dark purple pants, carrying a large maple-leaf fan made of flesh and bone. Karaku represents the desire for fun, indulgence, and excitement, treating fights as carefree games and distractions rather than serious conflicts. He maintains a cheerful smirk, lounging around and poking at strange objects before lazily waving his fan to generate massive, destructive gusts of wind while laughing at the chaos.

Aizetsu is a tall, slender demon with pale skin, dark blue hair, horns, and blue eyes marked "Sorrow," wearing a dark haori and carrying a flesh Yari spear. He embodies grief and depression, viewing existence and fighting as miserable chores. He speaks in a low whisper, thrusting his spear to launch long-range shockwaves while lamenting his burden.

Urogi is an avian-like demon with an athletic human torso, wild dark hair, small horns, golden eyes marked "Joy," a waist cloth, feathered black wings, and sharp bird talons for feet. He embodies hyperactive excitement, euphoria, and chaotic thrill, delighting in flight and high-speed combat. He perches on high structures, diving through the air to slash targets or emitting high-frequency sonic scream waves from his mouth.