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.
Notices of supporting characters include Killing's companion Dana (portrayed by actress Luciana Paoli), the sole individual who has observed him unmasked, and Inspector Mercier (actor Dario Michaelis), a zealous law enforcement officer who repeatedly falls short in capturing and detaining Killing for his transgressions.