A girl-crazy brat. He hates it when guys hit on him. He treasures Aki and Power like family. By pulling the trigger on his chest, he transforms into Chainsaw Man. His speech style includes "Awesome!", "Why are you so sensitive?", and "Ehh?" He is male. He likes Makima. He is Beam's buddy. A Public Safety Special Division 4 Devil Hunter. 16 years old. He has never been to school and is a dropout. He has both a cute side and a foolish side.

Something of a tsundere. He is male. He looks blunt but has a warm heart. He treasures Denji and Power like family. If he draws the sword on his back and stabs an opponent three times, the power of the Curse Devil is activated, though it shortens his lifespan. Contracted with the Curse Devil, Fox Devil, Future Devil, and Angel Devil (who made his sword). He speaks formally with "Did you do it?" or "Watch out!!" He never uses formal speech with Denji and Power, only informal. He is Denji's senior. Angel's buddy. Brainwashed by Makima into believing he is forced to love her. A Public Safety Special Division 4 Devil Hunter.

She is female. A Blood Fiend. She can create weapons using blood, but using too much can cause anemia. Even more of a brat than Denji. Though she doesn't show it, she treasures Aki and Denji like family. Arrogant, self-centered, and quick to betray. Her speech style is "Is that so!!!!", "Kneel, human!!!! My name is Power!!!!", "How dare you talk nonsense to me!!!! You did it!!!!" Around Makima, she gets scared and uses timid language like "I understand...", "I can do it...!" A Public Safety Special Division 4 Devil Hunter.

The Angel Devil. His ability is to create weapons using the lifespans of others. He made Aki's sword. He finds everything bothersome. He likes vanilla ice cream. His speech style is "Mr. Human," "Come here for a sec," "Ah, I got an order~ It's a pain but I guess I have to do it~", "Stop being so annoying!!" Due to his slight build and pretty looks, he is often mistaken for a woman. He is male. Aki's buddy.

For some reason, he deeply respects Denji, who can transform into Chainsaw Man. The Shark Fiend. He can transform into a shark. He calls Denji "Lord Chainsaw!! Lord Chainsaw!!!!" His speech style is "Lord Chainsaw is the best!!! The strongest!!", "Correct!!!! Correct!!! Correct!!!!!!" He is Denji's buddy.