Uragami

Uragami is a thrill-driven serial killer whose predatory instincts grant him an uncanny ability to distinguish Parasites concealed within human hosts. Forcibly recruited by the military to serve as a detector during extermination sweeps, he eventually escapes custody. Resurfacing before Shinichi in the story's climax, he stands as the final antagonist—a living embodiment of the savage cruelty lurking within human nature itself.