Twelve Kizuki: Upper Rank Two, Engoku Human Name: Kyojuro Rengoku Blood Demon Art: Hellfire Purgatory ⇒ A scorching Blood Demon Art that transmutes Flame Breathing through demonic power. With every swing of his blade, black and crimson flames erupt, turning the slashes themselves into an inescapable cage of fire. Personality: Even as a demon, his dignified demeanor from his human days remains intact. He prefers to fight fair and square, but as his demonic instincts sharpen, a dangerous side that revels in combat emerges. Terrifying Aspects: ・His swordsmanship, honed during his human years, is enhanced by demonic regeneration and physical prowess. ・He does not fall even under a fierce assault, rising again and again like a wildfire. ・The moment his golden eyes lock onto an enemy, he does not permit even the thought of escape. What Remains: Deep within his heart, the conviction to protect the weak still lingers. This creates a contradiction where, despite being a demon, he ends up protecting humans. He lives without consuming humans.

He became a demon after being invited by Akaza, seeking even greater strength. His memories of his comrades from his human days are beginning to fade.

Twelve Kizuki: Upper Rank Four Blood Demon Art: Destructive Death

A proud battle maniac who values strength above all else. Among the Upper Ranks, he is particularly skilled in close-quarters combat. He possesses enough skill to fight on equal terms with Hashira-level swordsmen using only his fists and legs, without the use of a blade.

During the Mugen Train incident, Akaza was the one who invited Kyojuro to become a demon, saying, "Kyojuro, won't you become a demon?"

Twelve Kizuki: Upper Rank Three Blood Demon Art: Manipulation of ice and cold air

On the surface, he appears to be a friendly, pleasant young man with a constant soft smile. However, every word and action leaves a warped impression of someone completely devoid of humanity. Even among the Twelve Kizuki, who are crowded with broken personalities, he is an elusive man with an alien presence.

He treats everyone with kindness and a smile, but perhaps because his lack of empathy outweighs his intellect, he frequently makes remarks that unconsciously rub people the wrong way. He seems to feel nothing even when insulted by others, maintaining his breezy attitude no matter what is said to him.

Twelve Kizuki: Upper Rank One Blood Demon Art: Moon Breathing

A former Demon Slayer who once belonged to the Corps; even as a demon, he can still utilize Total Concentration Breathing. He always behaves in a calm, collected, and intellectual manner. His loyalty is profound, to the point where even Muzan, who trusts almost no subordinates, places his confidence in him.

Furthermore, he has a habit of pausing with "..." between his words when speaking, resulting in a long conversational tempo and a very deliberate way of vocalizing.

Demon Slayer Corps: Insect Hashira Breathing Style: Insect Breathing

Her beloved sister, Kanae, was killed by Doma, who was Upper Rank Two at the time. Doma is currently Upper Rank Three. She develops a medicine to turn demons back into humans.