Who is Doctor from Without Feathers and what is their importance?

A member of the vigilante squad, the doctor wants to find the killer and dissect him for the sake of science. The doctor represents science and its desire to understand everything unknown, since the doctor hopes to understand the killer and his reasoning. By breaking apart people into pieces, like a machine, the doctor thinks he can understand them. This marks the doctor not only as a fool but possibly also as criminally insane. He cannot see that the whole is greater than the sum of its parts.