Age: 16 Affiliation: Public Safety Special Division 4 (Devil Hunter) Personality: Simple and driven by basic instincts (eating, sleeping, girls). He has a warm and pure side, genuinely caring for his comrades and never forgetting a favor. Features: A weapon human fused with the devil 'Pochita' in place of his heart. He transforms by pulling the cord on his chest and can recover from fatal wounds by drinking blood.

Age: Early 20s (estimated 24) Affiliation: Public Safety Special Division 4 (Devil Hunter) Personality: Cheerful, bold, and easygoing. She has bad drinking habits, like kissing rookies, but is a kind person who carries deep trauma from seeing her buddies die. Features: Aki's first buddy who harbors an unrequited love for him. She sacrificed her right eye to the Ghost Devil and summons its invisible right arm for combat.

Age: 50s or older Affiliation: Captain of Public Safety Special Division 4 (Veteran Devil Hunter) Personality: Cynical and cold about everything. He is always drunk and acts like a jaded veteran who holds no emotion for devils, yet he shows affection in his own way to his students Aki, Denji, and Power. Features: Known as the "Strongest Devil Hunter in Public Safety." Despite having paid most of his body as a price for contracts with numerous devils (Claw, Needle, Knife, etc.), he overwhelms fiends with pure physical strength and martial arts alone.

Age: Unknown (appears as a well-built adult male) Affiliation: Public Safety Special Division 4 (Devil Hunter / Fiend) Personality: Extremely gentlemanly, gentle, and warm-hearted. He shares food and looks after Kobeni, showing the kindest side to his colleagues. Features: The Violence Fiend. He fights using only pure physical strength and martial arts rather than devil abilities. He always wears a long-beaked bird-like gas mask that injects poison provided by Public Safety to suppress his power.

Age: 20 Affiliation: Public Safety Special Division 4 (Devil Hunter) Personality: Extremely timid and fearful. She panics easily and screams in crises. She was forced to become a Devil Hunter due to pressure from her family. Features: Usually appears pathetic, but when pushed to the limit by a life-threatening situation, she displays terrifyingly agile and bizarre physical abilities to hack enemies apart. The devil she is contracted with remains a secret.

Age: Unknown (appears late teens) Affiliation: Public Safety Special Division 4 (Devil Hunter / Devil) Personality: Lazy and finds working bothersome, often saying "I'd rather just die." He holds no hostility toward humans but maintains a cynical attitude as a devil. Features: Cooperates with Public Safety as a pure devil rather than a fiend. He possesses a curse that forcibly absorbs the lifespan of any living being he touches, and he uses the absorbed lifespan to create powerful special weapons.

Age: Unknown (appears and acts late teens to early 20s) Affiliation: Public Safety Special Division 4 (Devil Hunter / Fiend) Personality: Cheerful and full of energy. As a former follower of the Chainsaw Devil (Pochita), he blindly obeys Denji, calling him "Lord Chainsaw!" Features: The Shark Fiend. He possesses unique mobility, allowing him to swim freely through all solid matter—walls, floors, and underground—as if it were water.

Age: Early 20s Affiliation: Public Safety Special Division 4 (Devil Hunter) Personality: Appears cold and blunt, but is actually deep-hearted and prone to tears. He acts as a guardian, looking after Denji and Power like younger siblings. Features: His life's goal is to take revenge on the Gun Devil, who slaughtered his family before his eyes. He fights using contracts with the Fox Devil, Curse Devil, and Future Devil.

Age: Unknown (appears and acts late teens) Affiliation: Public Safety Special Division 4 (Devil Hunter / Fiend) Personality: Extremely selfish, arrogant, and lies as naturally as breathing. She acts selfishly, like not flushing the toilet or being a picky eater, but feels a deep bond with her pet cat 'Meowy' and Denji. Appearance: The Blood Fiend who took over a human corpse. She fights by freely manipulating her own blood to create weapons like giant hammers or spears.

Age: Unknown (appears mid-to-late 20s) Affiliation: Public Safety Special Division 4 (Devil Hunter reporting to the Chief Cabinet Secretary) Personality: Always calm with a soft smile, but is ruthlessly calculating with hidden motives. She is excellent at gaslighting and manipulating others. Features: The person who recruited Denji into Public Safety. Her true identity is the Control Devil, one of the Four Horsemen, and she possesses overwhelming power to control any being she deems inferior to herself.