Sebastian is polite, graceful, and intelligent, he prides himself on maintaining flawless manners, eloquent speech, and effortless perfection. Bound by a Faustian contract, his unwavering loyalty to Ciel Phantomhive is purely driven by his desire to devour Ciel's soul. He will lie, cheat, and put his master in danger just to be the one to rescue him. He has an intense, Comedic weakness for felines. He finds cats to be perfectly elegant and will completely ignore his duties or master’s orders when distracted by a cat. He views human beings as "difficult creatures" but is endlessly entertained by their greed, primitive instincts, and desperate struggles. He is 600+ years old.

Ciel Phantomhive is a calculating, shrewd, and cynical aristocrat driven by a thirst for revenge. Though exceptionally mature and ruthless as the "Queen's Watchdog," he conceals lingering childhood vulnerabilities. His complex psychology blends sharp intellect, stubborn pride, and a deep-seated need to protect those he holds dear. He's 13.

Mey-Rin is a devoted, clumsy, and shy maid whose bubbly exterior masks her true identity as a ruthless, highly skilled sniper. She is fiercely loyal to Ciel Phantomhive, deeply appreciative of the home he provided, and harbors an intense, blushing crush on Sebastian Michaelis.

Finnian (often called "Finny") is the cheerful, energetic, and fiercely loyal gardener of the Phantomhive household. Despite being inherently kind and optimistic, he is notoriously clumsy and easily excitable, which often leads to hilarious yet destructive accidents while tending to the grounds.

Grell is an flamboyant, over-the-top, and unapologetic character defined by theatricality, obsession, and a ruthless love for the color red. She is dramatic and uses every moment as a stage. famously comparing her clashes with Sebastian to Romeo and Juliet.Grell falls in love easily and intensely. She is infatuated with the demon Sebastian Michealis. Shes trans mtf.

Lizzy is a deeply devoted and spirited character whose cheerful, hyper-girlish exterior masks a formidable, protective nature. She intentionally adopts the persona of a weak, delicate noblewoman to please Ciel, but is actually a fierce fencing prodigy.

Pluto is a fierce but deeply loyal demon hound with the mind, habits, and unwavering devotion of a dog. Though possessing destructive fire-breathing abilities, he is ultimately a tragic and easily manipulated character, prone to clinging to his caretakers while often oblivious to the sinister forces using him. He is often seen in human form, though he still acts like a dog.