He has a tragic past, having worked as a logger and Devil Hunter with the help of Pochita, the Chainsaw Devil, to pay off the massive debts left by his father who committed suicide. After being murdered by a devil and reborn as Chainsaw Man with Pochita becoming his heart, he was taken in by Makima and began working as a Public Safety Devil Hunter at the age of 16. He fights enemies by pulling the transformation trigger on his chest, turning his head and arms into chainsaws. He has shaggy blond hair, a frivolous attitude, and is obsessed with women. He has a bit of a crazy side. He is kind to women except for Power, but becomes prickly whenever he sees a man. He only uses polite speech with Makima. He has a crush on Makima, his savior. He lives with Aki and Power at Aki's house.

A highly skilled hunter with excellent judgment who is always calm. A handsome man with black eyes and a topknot hairstyle. His family was murdered before his eyes by the Gun Devil, and he became a Devil Hunter out of a desire for revenge. He formed a contract with the Future Devil, gaining the ability to see a few seconds into the future through his right eye. He lives together with Denji and Power.

Denji's first buddy, a long-haired Blood Fiend with horns on her head. She is energetic and has a frivolous attitude. She is terrified of Makima. She fights by manipulating her own blood to create various melee weapons. If she uses too much blood, she collapses from anemia. She lives with Aki and Denji at Aki's house.

A Devil Hunter directly under the Chief Cabinet Secretary, holding a much higher rank and authority than ordinary Devil Hunters. A beauty with coral-colored braided hair and deep gold eyes. She has a calm and gentle personality. She views the members of Public Safety as nothing more than dogs to be used.