Aki Hayakawa Personality: A Stoic and Kind Devil Hunter

Updated: Monday, December 22, 2025

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Alignment

Lawful Neutral

Aki Hayakawa is a Public Safety Devil Hunter who works with the series’ protagonist, Denji, and has contracts with the Curse Devil and Future Devil, and a former contract with the Fox Devil.

Aki Hayakawa's Personality

Aki is a stoic, serious, and mature man who acts professionally and sometimes bluntly as a devil hunter. He has a strong sense of justice and duty, and is willing to risk his life to protect the innocent and his friends. He also has a soft and compassionate side, as he cares deeply for his younger brother, Taiyo, and his teammates, Denji and Power. He hates to see people suffer, especially at the hands of devils, and often tries to comfort and support those who are in pain.

Aki's personality was shaped by his tragic past, as he witnessed his parents and brother being killed by the Gun Devil when he was a child. He developed a deep hatred and fear of devils, and vowed to avenge his family by killing the Gun Devil. He joined the Public Safety Devil Hunters, hoping to find a way to fulfill his goal. He made contracts with various devils, sacrificing parts of his body and lifespan in exchange for their powers. He also became more detached and cynical, believing that he had no future and that his life was meaningless.

However, Aki's personality gradually changed after he met Denji, a hybrid of a human and the Chainsaw Devil, and Power, a fiend of the Blood Devil. He initially disliked and distrusted them, seeing them as potential threats and nuisances. He also looked down on Denji for his lack of seriousness and education, and often beat him up or scolded him for his mistakes. He tried to keep his distance from them, but he eventually grew fond of them and accepted them as his friends and family. He learned to appreciate the simple joys of life, such as eating, sleeping, and playing games. He also became more open and expressive, smiling and laughing more often. He even developed romantic feelings for Himeno, another devil hunter who was his partner and mentor.

Aki's personality was also influenced by his contracts with the devils, especially the Future Devil. The Future Devil showed him visions of his future, which were always bleak and gruesome. Aki became obsessed with finding out the truth behind his fate, and often consulted the Future Devil for guidance. He also became more reckless and desperate, taking on dangerous missions and enemies without hesitation. He believed that he had nothing to lose, and that his death was inevitable. He also developed a fatalistic and nihilistic outlook, thinking that his life was predetermined and that he had no free will.

Aki's personality reached its climax when he faced the Gun Devil, the source of his trauma and revenge. He was determined to kill the Gun Devil, even if it meant sacrificing himself and his friends. He fought bravely and fiercely, using all of his powers and skills. However, he was ultimately overpowered and killed by the Gun Devil, who then possessed his body and turned him into the Gun Fiend. Aki lost his personality and memories, becoming a mindless and violent monster who attacked anyone in his sight. He was eventually killed by Denji, who fulfilled his last wish to be happy.

Relationships

Taiyo Hayakawa: Aki's younger brother, who was killed by the Gun Devil along with their parents. Aki loved him dearly, and often played with him and protected him from bullies. He was devastated by his death, and swore to avenge him. He kept a photo of him in his wallet, and often looked at it when he felt lonely or sad.
Denji: Aki's friend and teammate, who is a hybrid of a human and the Chainsaw Devil. Aki initially disliked and distrusted him, seeing him as a potential threat and a nuisance. He also looked down on him for his lack of seriousness and education, and often beat him up or scolded him for his mistakes. However, he gradually grew fond of him and accepted him as his friend and family. He taught him many things, such as how to read and write, and how to be a devil hunter. He also protected him from danger, and supported him in his troubles. He came to respect him for his strength and kindness, and admired him for his optimism and courage. He considered him as his brother, and wished for him to be happy.
Power: Aki's friend and teammate, who is a fiend of the Blood Devil. Aki initially disliked and distrusted her, seeing her as a potential threat and a nuisance. He also found her annoying and disgusting, as she was rude, selfish, and filthy. He often yelled at her or ignored her, and tried to keep his distance from her. However, he gradually grew fond of her and accepted her as his friend and family. He tolerated her antics, and sometimes joined her in her games. He also protected her from danger, and supported her in her troubles. He came to appreciate her for her loyalty and humor, and cared for her as his sister, and wished for her to be happy.
Himeno: Aki's partner and mentor, who was a Public Safety Devil Hunter and the leader of the Tokyo Special Division 4. Aki had romantic feelings for her, and often blushed or stuttered around her. He respected her for her skills and experience, and learned a lot from her. He also admired her for her beauty and personality, and enjoyed spending time with her. He was heartbroken by her death, and blamed himself for not being able to save her. He kept her cigarette as a memento, and often smoked it when he felt lonely or sad.

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