Over the course of the series, Dexter killed at least 134 people - total savage.
Just because the Good Doctor actor has a Norman persona, it doesn't make it any less disturbing.
Whether his humanity is turned on or off, Stefan Salvatore has killed dozens - if not hundreds.
After training to become an assassin with the ability to change faces, it doesn't look like much will stop Arya from finishing checking those names off her kill list.
Fiona Goode is a fine witch, when she isn't eliminating members of her coven to succeed for all eternity.
When we found out Hester was one of the Red Devil serial killers, it didn't shock us. Especially since she was always very open about her disturbingly sexual obsession with death.
Rene went so far as to kill his own sister because she was a fangbanger. This set him off on a vampire-lover killing spree, which ended in a deadly showdown with his attempted victim Sookie.