Gustav Kottmann was an infamous serial killer known as the demon axe murderer. Kottman was abused as a child and suffered head trauma. Upon reading the Dorn of the Darkness picture book, Kottman became infatuated with Fuhr and began sending him "fan letters" and started his serial killings. Four years ago, Kottman made a critical mistake and was almost captured before being rescued by Fuhr. On Fuhr's orders, he murdered 3 hospital employees who was his face before killing himself.
- His name is actually spelled Gustav Kottmann, but since he was on the Other Minor Characters list, the wikia won't allow the page to be spelled that way.