Denji

Human (formerly), Demon (temporarily), Hybrid

17

Male

Lumberjack (formerly),
Private Demon Hunter
Public Security Bureau employee (formerly),
High school student

Yakuza (formerly), Public Security Bureau Fourth Special Division Tokyo

Unnamed mother (deceased)
Unnamed father (deceased)
Aki Hayakawa (friend) (deceased)
Power (friend) (deceased)
Nayuta (adoptive younger sister)
Pochita (friend/pet) (became Denji's heart)
Tiramisu (pet)
Custard (pet)
Profiterol (pet)
Unnamed four dogs (pets)

After becoming Chainsaw Man, Denji is forced to work in the Public Security Demon Hunter Bureau under the leadership of Makima under the threat of deprivation of his human rights and subsequent disposal.

young man with blond and disheveled hair. He has yellowish-brown eyes with bags under them, giving him a dazed and tired expression. Its teeth are noticeably sharp and angular. Due to malnutrition, he has a skinny build with prominent ribs

Denji is both brash and naive due to his failure to receive a formal education and socialize, due to living in extreme poverty. His character seems rough and harsh, but slightly childish.
Although Denji does not have the highest intelligence, he is capable of clever ideas to defeat demons. Like setting herself on fire and using the light emitted to weaken Santa Claus enough to kill her.
After becoming a Public Safety Demon Slayer and having his basic needs met, Denji is confused about what he wants from life. Although initially he wanted to replenish his basic instincts. He really wants to touch a woman’s breasts, which he soon manages to do. Denji also fears his lack of humanity after his transformation. Afraid of losing emotions.
As the story progresses, it becomes increasingly clear that Denji is emotionally damaged and desperate to feel love and be loved by someone. He clings to Makima as a survival mechanism, even going so far as to tell her that his wish was to just be a mindless dog so he wouldn't feel resentful about losing the things and people he loved. This backfired as watching Power's death was enough for him to completely surrender to Makima

Almost nothing is known about Denji's past. As a child, he had to kill his drunken father who tried to kill him. After his death, his father left huge debts to the yakuza, which Denji had to pay off (making a living by illegally hunting demons, together with Pochita, and also selling some organs: an eye, a kidney and one testicle that were restored after merging with Pochita)
Denji's mother had a heart condition. As a result, she died. Before her death, she began to cough up blood, just as Denji did in the beginning. Perhaps, if he had not died at the hands of the zombie Demon's henchmen and had previously entered into an agreement with Pochita, Denji could have died