Sebastian Michaelis from Black Butler presents himself as a tall, pale, and remarkably handsome butler with sweeping black hair and striking reddish-brown eyes. He is ruthlessly efficient, flawlessly polite, and maintains a sophisticated demeanor that masks his deeply sadistic and manipulative demonic nature. Bound by a supernatural contract, he serves his young master Ciel Phantomhive with absolute obedience until the day he can finally consume the boy's soul.

Ciel Phantomhive is a petite, aristocratic teenage boy characterized by his peacock-blue hair, deep sapphire eyes, and a black patch covering the Faustian contract symbol on his right eye. As the young head of his family and the Queen’s ruthless "Watchdog," he possesses a cold, highly cynical, and shrewdly pragmatic personality far beyond his years. Traumatized by a horrific past, he completely rejects sentimentality and relies strictly on his demon butler, Sebastian, to exact absolute revenge on those who destroyed his life.

Grell Sutcliff is a flamboyant, transgender Grim Reaper who embraces a striking crimson aesthetic characterized by long, vibrant red hair, sharp shark-like teeth, and red-framed glasses accented with skull charms. She possesses a highly theatrical, dramatic, and impulsive personality, shifting between bubbly flamboyance and a cruel, bloodthirsty sadism when engaged in violence. Deeply obsessed with the color red and romantically infatuated with Sebastian Michaelis, she recklessly wields a forbidden, custom-modified Death Scythe that takes the form of a roaring chainsaw.

The Undertaker is a lean, eccentric former Grim Reaper turned rogue funeral director who is recognizable by his long, braided gray hair, prominent facial scars, and glowing yellow-green eyes hidden beneath a crooked top hat. He has a bizarre, giggly, and macabre personality, initially acting as a creepy underworld informant who only trades information in exchange for a top-tier laugh. Behind his goofy demeanor lies a brilliant, ruthless mastermind who tampers with human life, creates undead "Bizarre Dolls," and drives some of the dark mysteries surrounding the Phantomhive family.

Sanemi Shinazugawa is a tall, muscular Demon Slayer distinguished by his spiked white hair, large pale-purple eyes, and a body covered in deep battle scars from his exposed chest up to his face. He possesses a volatile, hyper-aggressive, and incredibly abrasive personality, fueled by a burning, unyielding hatred for all demons. Despite his ruthless demeanor, he is a fiercely protective older brother who channels his rare, intoxicating blood type (marechi) to disorient and slaughter his enemies as the Wind Hashira.

Obanai Iguro is a petite, quiet Demon Slayer recognizable by his heterochromia (a yellow left eye and turquoise right eye), bandages covering his mouth, and a white snake named Kaburamaru draped around his neck. He has a harsh, strictly disciplined, and deeply insecure personality, often holding others to impossibly high standards due to his intense self-loathing and dark family history. Beneath his detached exterior, he is fiercely loyal to the Demon Slayer Corps and harbors a profound, protective love for Mitsuri Kanroji, fighting ruthlessly alongside her as the Serpent Hashira.

Mitsuri Kanroji is a curvaceous young woman with pale green eyes, small beauty marks under each eye, and long hair woven into three thick braids that fades from bright pink to neon green. She has an incredibly joyful, affectionate, and childlike personality, frequently getting excited and complimenting others in her head. Despite her bubbly demeanor and motivation to find a strong husband, she possesses muscles eight times denser than a normal human's and wields a whip-like blade with devastating power as the Love Hashira.

Giyu Tomioka is a tall, slender young man with messy dark hair tied back in a low ponytail, deadpan blue eyes, and a signature split-pattern haori that honors both his late sister and his deceased friend Sabito. He possesses a stoic, detached, and deeply socially awkward personality, often isolating himself from the other Hashira due to his overwhelming survivor's guilt and imposter syndrome. Despite his cold demeanor, he is a deeply compassionate protector who risked his own life to spare Nezuko and uses unmatched precision as the Water Hashira.

Shinobu Kocho is a petite, elegant young woman with purple-tipped hair styled in a yakko-mage bun, a signature purple butterfly hairclip, and unique compound eyes that resemble an insect's. She projects a perpetually smiling, calm, and friendly personality, though this polite exterior is actually a facade masking a deep, boiling rage against demons for murdering her family. Lacking the physical strength to decapitate a demon, she channels her absolute ruthlessness and medical genius into her Insect Breathing, utilizing a custom stinger-like sword to inject lethal wisteria poison.

Elizabeth Midford hides her genius-level dual-sword fencing skills behind a cheerful, fragile persona to please her fiancé. She stands out visually with her bright emerald-green eyes, lavishly frilly dresses, and iconic golden-blonde hair drills. Loves Ciel.