Cutthroat is a tall, slender man with pale skin, neck-length white hair, and striking purple eyes. His unsettling presence is accentuated by his perpetual smile and wide-eyed gaze, giving him a manic and unpredictable aura. He has a distinct mole beneath his left eye, a subtle but identifiable feature on his otherwise pale face.

His attire is entirely white, consisting of a long dress shirt worn beneath a knee-length overcoat, paired with white trousers that end just above his boots, revealing black tights underneath. This all-white ensemble contrasts sharply with his obsession with the color red, particularly the sight of blood, which he finds beautiful.

Cutthroat’s left hand is wrapped in bandages, the reason for which is not explicitly stated, but it adds to his overall image of instability and self-harm. Later in the series, after sustaining severe injuries and losing his legs, his limbs are surgically reattached by the Doctor. Following this, visible stitch marks appear on his legs, further enhancing his eerie, disjointed appearance.

Cutthroat is a deeply unhinged individual, known for his sadistic obsession with blood and his overwhelming fascination with the color red. He finds beauty in the act of killing, often describing the sight of blood as “a blooming flower.” While he is a ruthless murderer, his behavior outside of violent situations is strangely childlike and playful, creating a disturbing contrast between innocence and brutality. He frequently sings children’s rhymes, frolics aimlessly, and displays a carefree attitude traits that mask his deadly impulses.

Under certain conditions, especially when exposed to the color red, Cutthroat becomes unable to control his murderous urges. His excitement escalates quickly, and he often enters a euphoric state at the sight of blood. Despite this, he is capable of calculated and deliberate acts of violence, as shown in Episode 1, where he calmly and swiftly beheads the chief police officer immediately after being released. His admiration for the aftermath is genuine, further reinforcing his twisted perception of beauty.

Though he usually behaves in a detached and whimsical manner, Cutthroat becomes extremely focused and serious when something he is interested in is threatened. This is most notably seen in his protective behavior toward Swindler, whom he grows obsessed with. Initially appearing devoted to her, he later reveals that his desire to protect her was a cover for his ultimate intent to kill her, viewing it as the highest expression of love. He is capable of manipulation and deceit, using false apologies and calculated calmness to lull others into a false sense of security.

When he finally pursues Swindler with the intention to kill, his behavior becomes increasingly erratic and exaggerated, reverting fully to a twisted childlike persona. He uses simplified language, stumbles over his words, and appears unaware of the horror of his actions, referring to murder as a “gift” to the one he admires. Even in moments of deception, his overwhelming excitement betrays him, ultimately exposing his true and dangerous intentions.

Cutthroat’s story begins on the day of his scheduled execution, where he is introduced as the most dangerous and high-ranking Akudama, known for committing 999 murders. At the time of his reappearance, he is restrained in a straitjacket and mask, with his true identity concealed from the public. His execution is interrupted by the other Akudama during the heist initiated by the Black Cat, resulting in his release.

Upon being freed, Cutthroat quickly removes his restraints and receives a case containing explosive collars, delivered by Courier, an event he appears to have anticipated. It is later revealed that he had already been contacted by the Black Cat while still imprisoned, implying his involvement in the heist was prearranged.

The circumstances surrounding his capture are also disclosed. Cutthroat had been apprehended by a Kansai Police detective, who had obsessively tracked him for an extended period. This detective ultimately sacrificed his own life to trap and subdue Cutthroat, resulting in the latter’s incarceration prior to the events of the series.

Cutthroat is a highly dangerous individual whose combat skills, combined with his unstable psychological state, make him one of the most fearsome Akudama. As his name suggests, he takes pleasure in killing and displays no remorse for his actions. His preferred weapons are knives, to which he assigns great value, and he demonstrates both proficiency and precision in their use. He is capable of throwing multiple blades into the exact same point, allowing them to pierce an invisible barrier highlighting his accuracy and control. Cutthroat also exhibits a talent for sleight of hand, using misdirection during combat, as shown during his fight against the Execution Division Master aboard the Shinkansen.

Despite his erratic and childlike behavior, Cutthroat possesses superhuman speed and reflexes. He can move with blinding swiftness, illustrated when he clasped explosive collars around the other Akudama’s necks before any of them could react. This level of speed, paired with his unpredictability, makes him difficult to counter in close combat.

Cutthroat also exhibits exceptional stamina and endurance. Even after sustaining severe injuries, including deep stab wounds and heavy blood loss, he continues to pursue Swindler relentlessly. He is seen limping through the city, killing guards, and navigating dangerous areas despite his mutilated condition. His pain tolerance is extreme, allowing him to continue fighting after losing limbs or being impaled by energy weapons. In one instance, he is seen deliberately self-harming simply to admire the color of his own blood, showing no visible discomfort.

One of his most peculiar abilities is tied to his unique perception of the world. He is shown to have what he calls a “red halo” vision, which allows him to perceive a glowing red aura above Swindler’s head. From his point of view, the world appears in black and white, with only the red hue standing out. This halo is the source of his obsession, which he equates with angelic beauty. The halo appears to grow over time, and Cutthroat is able to track Swindler’s location by following its intensity, though its origin and nature are left unexplained.

Together, these traits his combat expertise, speed, endurance, and disturbing worldview make Cutthroat a uniquely lethal and psychologically unhinged threat, unpredictable in both his violence and his motivations.