14. Jules and Vincent
Pulp Fiction – 2 during the course of the film + countless others
These guys are deadly hitmen in the service of Marsellus Wallace; they’ve killed a lot of people. We don’t see all the killing, but it’s strongly implied.

What we do see is Jules shooting Brett just to prove a point, while Vincent ‘accidentally’ shoots Marvin in the face in the car. Then, at the end, they manage to diffuse a diner robbery without bloodshed.