Supporting characters include Killing's lover Dana (portrayed by actress Luciana Paoli), the only person who has seen him unmasked, and Inspector Mercier (actor Dario Michaelis), a determined police officer who always just misses catching and detaining Killing for his crimes.
Supporting characters are introduced, including Killing's romantic partner Dana (played by actress Luciana Paoli), the only person to have seen him unmasked, and Inspector Mercier (actor Dario Michaelis), a determined law enforcement officer who consistently fails to apprehend and bring Killing to justice for his crimes.