Fiddler from Malazan

Anomander Rake from Malazan

Benji from Beartown

Sevro from Red Rising

Kelsier from Mistborn

Death from Discworld

Sam Vimes from Discworld

Among others

Every time the fear knight shows up on page you know something absolutely fucked up is gonna happen, like >!taking Tharsus, chopping his hands and feet off in zero g, crushing his bones, putting a bowl over his head to preserve it as a trophy, then throwing him, alive, into a cage to be eaten by a manticore. All without hesitating one second, like it is second nature for him.!< (spoilers Light Bringer)