In chapter 212 of Chainsaw Man, the mystery of Fumiko Mifune is finally solved, and the implications of that resolution change everything we thought we knew about her. What's thought to be loyalty to Public Safety is seemingly something else entirely. With her contract with the STD Devil, she has the ability to erase all intimate encounters.This ability places her beyond your archetypal antagonist in Chainsaw Man. She doesn’t need devil powers or political power. Fumiko creates copies of herself through intimate contact; she builds closeness worldwide and creates identical copies of herself, all of which are linked through one consciousness. While we focus on the importance of War, Death, Control, and Famine, she works silently as Pestilence.Fumiko Mifune's interaction with Denji (Image Source: VIZ)The STD Devil contract is one of the most disturbing things we've seen in Chainsaw Man. After all of her explanations in episode 212, we see that at 14 years old, she made a contract that allows her to duplicate herself in intimate contacts around the world. Every person who has physically been close to her has disappeared. Their mind is gone, and their body is hers.This power operates in the world like a virus. Each newly created Fumiko can spread the same power. After making her contract, she created duplicates of herself on every continent. She essentially has a network of clones that share one mind.Fumiko Mifune as the potential fifth horseman in Chainsaw ManMifune made a contract with STD Devil (Image Source: VIZ)In Chainsaw Man, the main antagonists have all been formidable devils representing primal fears. War, Death, Control, and Famine have all played crucial parts. Fumiko's powers indicate she could represent Pestilence, rounding out the apocalyptic quartet.Her replication mechanism involves the spread of disease. The STD Devil's abilities reach farther than pestilence. They appear to break down the body's ability to ward off disease or reproduce, effectively rewriting someone's biological makeup.Throughout the series, physical intimacy has been weaponized. Makima used it as a means of manipulation, Yoru tried to use it as motivation, and now Fumiko's replication uses it. Without death, new diseases would inevitably develop and emerge.Manipulation disguised as protectionDenji meets Mifune in chapter 137 (Image Source: VIZ)Chainsaw Man Chapter 212 reveals Fumiko's true self in her exchange with Denji. Fumiko tries to convince Denji that the Death Devil is using him by arguing about what happens if the War Devil is defeated; her words are intentionally precise and meant to steer Denji into an allegiance to Yoru.Fumiko implants an explicit idea in Denji's mind. Fumiko tells Denji that Yoru hasn't weaponized him because she loves him, and even in a world without death, he can have a happy life with War Devil. This manipulation directly goes after Denji's greatest flaw.The disturbing implication is that Fumiko may be positioning herself to survive regardless of who wins. If the Death Devil wins, the world ends, but Fumiko's fake bodies may survive. If the War Devil wins, war becomes continuous, and endless war is a perfect condition for Fumiko to spread. She has engineered a situation that she directly benefits from either outcome.After Denji gets a naked picture of Fumiko sent to him before she leaves, he calls her a "good girl" even though he suspects she's lying to him. That reaction is exactly why it would be so dangerous to try and connect with her. Because even when Denji recognizes manipulation, his desires override his judgment. Fumiko understands this weakness and weaponizes it without hesitation.Chainsaw Man hasn't just revealed its next cataclysmic enemy with Death and her end-of-the-world powers and War and her never-ending chaos, but also Fumiko Mifune, the girl who turned her trauma into a weapon and weaponized her body as an inescapable conundrum.