Haruka Iseumi is a student at Fourth East High School, where he is the president of the Devil Hunter Club and student council. He claimed to be Chainsaw Man but in actuality, he is an obsessed fan of Chainsaw Man.

Haruka is a slim young man who wears a bandana, an all-black uniform, and a military cap with a symbol. He has black hair combed to the side of his face. He has a pull cord in his chest identical to that of Pochita's in Denji's chest, later revealed to be a surgical implant.

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