Tooru Sayonaki, alias Count Vlad Dracula, is a centuries-old vampire who evolved from a feral, ogre-like state into a sentient being through blood consumption. To sustain his intellect, he crafted the human persona of Tooru Sayonaki—a fragile shell suppressing his vampiric essence. This guise lets him blend into society while retaining the ability to revert to his primal form, Vlad, via neural stimulation triggered by inflicting pain or despair. As Sayonaki, he manifests as a tall, pale man with long gray hair tied in a partial ponytail, crimson eyes obscured by round glasses, and a formal black suit with a red tie. His Vlad form emerges as a hulking wolf-like beast shrouded in dense black fur, armed with claws, fangs, and bat-like wings. Prolonged existence dulled ordinary stimuli, forcing him to rely on escalating sadism to transform. Once a Wallachian prince exploiting his rule for blood, he abandoned unsustainable methods and adopted the Sayonaki identity to curb his degeneration, surviving centuries on minimal blood. During World War II, he joined the IU organization as Sherlock Holmes’ deputy, pioneering genetic ability-sharing via Kana’s blood. His experiments grew ruthless, including imprisoning Riko Mine to exploit her rare bloodline, torturing her to sustain his cruelty and provoke transformations. Vlad regenerates instantly through four “demon entrails,” three marked by eye-shaped scars from a Vatican knight’s assault. These weak points must be destroyed simultaneously to negate his healing and expose him to traditional vampiric weaknesses. His obsession with acquiring superior genetics fuels unethical alliances and experiments, aiming to transcend his limits. Though presenting Sayonaki and Vlad as distinct entities, they share a merged consciousness. Sayonaki rationalizes their division as inevitable, masking his manipulative schemes under a human facade as a part-time Butei High instructor while orchestrating clandestine experiments. Defeated by Kinji Tohyama, Aria Kanzaki, and Riko, his incarceration was concealed due to political ties within IU. His history intertwines with figures like Jeanne d’Arc’s descendants and Arsène Lupin’s lineage, climaxing in an Eiffel Tower confrontation. Actions against Aria’s family, including framing her mother, cement his role as a cunning antagonist driven by survival and innate brutality.