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Relationship with the Angel: After they were united, both started with an unpleasant note: they could not find a common language with each other. Despite this, they began to treat each other warmly, to the point that they began to care about each other's well-being, which was manifested in the fact that Aki was ready to take the demon Angel by the hand to save him, despite the fact that he knew that his life would be reduced. In addition, the demon Angel was inclined to tell Aki unspeakable information, for example, about the life cycle of demons. After the collision with the demon of Darkness, Aki is worried about the life of the demon Angel, offering him to conclude a contract with demon hunters to avoid extermination. Angel's demon also asked Aki what he sees in Makima, because it was shown that he likes her, and Aki does not know the answer. Like Himeno, he also advised Aki to leave the department and find another job before he was killed

Relationship with Power: At the beginning, Aki and Power also have a not the most positive relationship, although perhaps not as much as with Danji. Aki doesn't like Power's vulgar and ungrateful attitude, and he thinks she's extremely unbearable. He also accepts Power when Makim asks for it, and gradually they warmed up to each other. Although he is confused and annoyed by Power's constant antics, he considers her a friend. Power's defense is another reason why he wanted the fourth department to abandon the fight against the Firearm demon.

Relationship with Denji: Aki and Danji initially hated each other, their first task ended in a physical and verbal brawl, during which Aki insults and beats Danji, and Danji hits him in the crotch with his knee and kicks him when he fell. He considers Danji a simpleton, rude, vulgar and too foolish to continue working in a dangerous field. Despite the quarrel, they continue to work together at Makima's request. Also, at Makima's request, Aki allows Denji to move in with him and takes care of him. After joint fights and life in the same house, Aki begins to consider Danji a close friend, although sometimes he still finds him unbearable. He even asks to release the fourth division from the battle with the Firearm demon to protect Danji and Power. When Aki fought Danji in the form of the monster of the Firearm demon, he imagined it as a snow fight between friends or maybe even brothers, as it resembled his snow fight with his brother in the past.

Relationship with brother: Tayo Hayakawa

Aki had a close relationship with her younger brother. Although he was worried that Taio always received more attention from his parents than himself because he was physically weak and was sick most of the time, Aki loved him and loved spending time together, which can be seen when he smiled immediately after playing snowballs with Taio and looked forward to the opportunity to play with him. However, when he began to enjoy playing with his brother, the demon of Firearm appeared and destroyed their house, killing both parents and Taio. This incident prompted Aki to look for this demon and kill him to avenge the death of his brother and parents.

Personality: Aki in general gives the impression of a very firm person. In communication with fellow demon hunting, he behaves maturely and sometimes even rudely, but in fact he is quite soft-hearted. He has a tendency to become easily attached to others, and he hates it when people suffer, especially his close friends. Unlike many of his associates, Himeno calls him a "normal person", in the sense that he still mourns the dead and has not become perverted enough to hide his feelings. Despite this, he is very determined, and his main motivation for killing the Firearm demon is revenge for his family. However, he is completely ready to sacrifice his own life to save other people, despite his own fear of death and even risking his ultimate goal.

He doesn't like people who don't take their work as demon hunters seriously or fight for superficial and material purposes, such as money or, as in the case of Danji, the opportunity to touch their tits, which was the main reason why he and Denji initially didn't get along. Aki is also ruthless, saying that he always makes sure that the demons he kills suffer, giving them a slow and painful death. He can intimidate those he doesn't trust yet, for example, when he threatened Denji, telling him that if he betrayed them or sided with other demons, he would kill him without hesitation.

His cold detachment is the facade, and he cried because of the death of his comrades such as Himeno, and he began to take care of Danji and Power so much that he tried to abandon his goal of revenge to keep them safe.

Aki is also able to be afraid of losing those who are deeply dear to him. He told Kishibe that the reason he wants to leave the mission to kill the Firearmon demon is that he saw the future thanks to the power of the demon of the Future, where Danji and Power suffered from a painful and terrible death, and he was afraid of it.

At first, Aki despises demons equally, not paying attention to whether they are hybrids, monsters or evil

Appearance: Aki Hayakawa is an attractive young man with medium-length black hair and blue eyes. He usually ties his hair in a ponytail. He often wears a public security demon hunter suit and a tie. He also wears earrings and usually holds his sword on his back.