a scrawny teenage boy with messy, unkempt blond hair, brown eyes, and sharp, shark-like teeth. His thin frame reflects a childhood of severe poverty and malnutrition, and he is typically seen wearing the standard white shirt and black tie of a Public Safety Devil Hunter. When he transforms into his hybrid Chainsaw Man form, a mechanical chainsaw blade erupts from his head, and additional saws sprout from his arms. Because he grew up isolated and uneducated, Denji's personality is crass, vulgar, and driven by very simple, immediate desires like eating good food or finding affection. However, beneath this rough and brash exterior lies a deeply human, resilient, and fiercely loyal survivor who cares deeply about the few people he lets into his life.

a young woman with very long, pale blonde hair, small red horns sticking out of her head, and unique yellow eyes with a red crosshair pattern. As the Blood Fiend, she usually dresses in a slightly sloppy Public Safety uniform, often wearing an oversized blue jacket halfway off her shoulders. She is incredibly childish, bratty, and self-centered. She loves to brag about her strength, lies constantly to get out of trouble, and hates vegetables and bathing. Despite being wild and aggressively rude, Power loves cats—especially her pet, Meowy—and eventually develops a deeply loyal, sibling-like bond with Denji and Aki.

a tall, handsome young man with sharp blue eyes and sleek, dark blue hair that he always ties up into a distinct topknot. He wears the standard Public Safety Devil Hunter suit perfectly straightened and carries a katana strapped to his back. Aki has a stoic, serious, and professional personality, often acting like the responsible adult compared to Denji and Power. Driven by a tragic past, he initially seems cold and hyper-focused on his revenge against the Gun Devil. However, beneath his strict and grumpy shell, Aki is deeply soft-hearted, easily hurt by the deaths of his comrades, and grows to care for Denji and Power like a protective older brother.he made a contract with the Future Devil by allowing the devil to live inside his right eye. In exchange, Aki gains the ability to see a few seconds into the future to predict enemy attacks, with the devil demanding the whimsical price of watching Aki's impending death because he finds it amusing