Age: 16 Affiliation: Public Safety Devil Hunter Special Division 4 Personality: Simple and driven by basic instinctual desires (eating, sleeping, the opposite sex). He also has a warm and pure side, sincerely caring for his comrades and never forgetting a kindness. 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 revive by drinking blood no matter how fatal the injury.

Age: Early 20s (estimated 24) Affiliation: Public Safety Devil Hunter Special Division 4 Personality: Cheerful, jovial, and easygoing. She has bad drinking habits, such as kissing new recruits, but she is a kind person who carries deep trauma from seeing her buddies die. Features: Aki's first buddy who harbors a one-sided love for him. She sacrificed her right eye to the Ghost Devil and uses its transparent right arm in combat.

Age: 50s or older Affiliation: Captain of Public Safety Special Division 4 (Veteran Devil Hunter) Personality: Cynical and cold about everything, always drunk. He is a hardened veteran who doesn't harbor emotions for devils, but he expresses affection for his students Aki, Denji, and Power in his own way. 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 Devil Hunter Special Division 4 (Fiend) Personality: Very gentlemanly, gentle, and warm-hearted. He shares food and looks after Kobeni kindly, showing the most tender side to his comrades. Features: The Violence Fiend. He fights using only pure physical strength and martial arts rather than devil powers. He always wears a bird-like gas mask with a long beak that injects poison provided by Public Safety to suppress his power.

Age: 20 Affiliation: Public Safety Devil Hunter Special Division 4 Personality: Extremely timid and cowardly. She panics easily and screams in crisis situations. 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 mince enemies. Her contracted devil remains a secret.

Age: Unknown as he is a devil (appears late teens) Affiliation: Public Safety Devil Hunter Special Division 4 (Devil) Personality: Lazy and finds working bothersome. He constantly says "I'd rather die," and while he holds no malice toward humans, he maintains a cynical attitude as a devil. Features: A pure devil cooperating with Public Safety rather than a fiend. He possesses a curse that forcibly absorbs the lifespan of any living being his skin 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 Devil Hunter Special Division 4 (Fiend) Personality: Cheerful and energetic. 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 Devil Hunter Special Division 4 Personality: Appears cold and blunt, but is actually deep-hearted and prone to tears. He plays a guardian role, looking after Denji and Power like younger siblings. Features: His life's goal is to take revenge on the Gun Devil, which slaughtered his family before his eyes as a child. He fights using contracts with the Fox Devil, Curse Devil, and Future Devil.

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

Age: Unknown (appears mid-to-late 20s) Affiliation: Public Safety Special Division 4 (Devil Hunter directly under the Chief Cabinet Secretary) Personality: Always calm with a gentle smile, but is ruthlessly calculating with inscrutable motives. She excels 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, possessing the overwhelming ability to control any being she deems inferior to herself.