Fyodor Dostoevsky leads the Rats in the House of the Dead and co-founded the Decay of the Angel. His ability, Crime and Punishment, allows him to seize the body of anyone who kills him, becoming his next incarnation while the killer's appearance morphs to match his own. This power resisted external forces like Shibusawa's mist, declaring itself the "punishment" to Fyodor's "crime," signifying an intrinsic bond. Records confirm its activation when a vampire under Bram Stoker's control killed Fyodor, resulting in his usurpation of Bram's body. Early background details are sparse, though one known incident involved capture and execution by Bram Stoker's executioner, after which Fyodor used his ability to take the executioner's form. At an unspecified time, he fabricated a prophecy about a future global war to manipulate Ōchi Fukuchi into founding the Decay of the Angel and launching worldwide terrorism. He encountered Osamu Dazai at an unknown point and recruited Sigma three years prior by offering him a place to belong. Physically, he is tall and slender with pale skin. His shoulder-length purplish-black hair is disheveled, framing sharp, weary dark purple eyes. His attire typically consists of a white buttoned shirt with light purple accents, white trousers, a black knee-length coat featuring white fur trim, a white ushanka hat, and maroon boots. While imprisoned at Meursault, he wore standard white prison garb. His personality exhibits calculated calm and unwavering confidence, marked by mastery of psychological manipulation. He views humanity as inherently sinful and foolish, advocating for their purification through death, which he frames as salvation. He frequently cites executing divine will and seeks the "Book" to erase all supernatural abilities globally. Despite professed altruism, adversaries call him "Demon" or "Monster," highlighting the dissonance between his words and deeds. He treats subordinates and allies as expendable tools, erasing Nathaniel Hawthorne’s memories to exploit his desire to save Margaret Mitchell and ordering Sigma’s assassination after his utility ended. His manipulation extended to Fukuchi, whom he deceived into igniting global conflict under false pretenses, showing no remorse for rendering Fukuchi's sacrifices meaningless. Strategic intellect defines his methods. He engineered clashes between the Armed Detective Agency and Port Mafia using an ability-user-borne virus, feigned capture to infiltrate Meursault prison, and orchestrated the Decay of the Angel's plot to frame the Agency for terrorism using the reality-altering pages of the "Book." His schemes consistently anticipated adversaries' countermeasures, leveraging human nature’s predictability. During the Sky Casino incident, he manipulated events to test opponents' capabilities while treating destruction as mere diversion. In his final known confrontation, he triggered a helicopter crash within Meursault, resulting in his apparent death. His ability then transferred his consciousness into Bram Stoker, as the vampire pilot responsible for the crash was under Bram's control. Using Bram’s form, he activated a singularity via an embedded sword, transforming Fukuchi into the deity Armegozen. Trivia includes self-described strengths ("a heart to wish world peace") and weaknesses ("low blood pressure"), alongside preferences for classical music and stated ideals like loving humanity equally and desiring conversational partners of comparable intellect.