13 of 13 fiends
Alive
Power
The Blood Fiend, loud, dishonest and unrepentant about both. She sells Denji out inside a day of meeting him and spends the rest of the series slowly working out what having a friend involves.
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Deceased
Aki Hayakawa
Public Safety hunter and the closest thing Denji has to an older brother, which is the setup for how badly it goes. He signs the Fox, the Curse and finally the Future, and every contract takes something he cannot get back.
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Deceased
Beam
The Shark Fiend, and the only member of Division 4 who is uncomplicatedly delighted to be there. He decides Denji is Chainsaw Man and therefore his master, and acts on that with no further questions.
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Deceased
Galgali
The Violence Fiend, a Division 4 hunter kept in a gas mask because removing it makes him considerably more dangerous than the situation usually requires.
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Alive
Asa Mitaka
A high school student sharing her body with Yoru, the War Devil, after dying and being offered the arrangement instead of staying dead. The Academy Saga is largely Asa trying to have a normal adolescence with a Horseman in her head.
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Deceased
Cosmo
The Cosmos Fiend, one of Quanxi's girlfriends. Says the word Halloween a lot, and shows exactly once what happens when the concept she embodies is applied to a human mind.
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Alive
Gun Devil
The devil of firearms, and the reason most of Public Safety's hunters signed up. It killed over a million people in a few minutes, then vanished, leaving governments to carve up its remains as leverage.
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Deceased
Loneliness Fiend
The Loneliness Fiend, antagonist of the third Buddy Stories chapter. Manga only.
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Deceased
Long
One of Quanxi's fiends. Fights with an arm that opens into something considerably larger than an arm, and dies in Hell alongside most of the group.
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Alive
Nail Fiend
The Nail Fiend, a Division 7 hunter. Manga only, and one of the few fiends the series treats as ordinary staff rather than a spectacle.
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Deceased
Pingtsi
One of Quanxi's fiends. Cheerful, talkative, and full of useless facts she deploys mainly to make Quanxi look at her.
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Deceased
Tsugihagi
One of Quanxi's fiends, stitched together and rarely audible. Carries Quanxi's head out of Hell when the rest of the group does not make it.
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Unknown
Yoru
The War Devil, one of the Four Horsemen, occupying Asa Mitaka's body. She turns things she owns into weapons, and her opinion of Asa is that Asa is one of them.