Fumiko Mifune is a Public Safety Devil Hunter from Tokyo Special Division 7 who worked with Hirofumi Yoshida. She was formerly tasked with serving Denji as his so-called "bodyguard", in which she attended Fourth East High School to "protect" Denji from threats who may know his identity as Chainsaw Man. She has a contract with with the STD Devil and, despite her upbeat demeanor, she's very focused on her own survival and is psychopathic while also being chaotic, predatory and unprofessional.