The John Wick series is filled to the brim with memorable assassin characters, but some are more deadly than others. As the franchise has continued, its world has only grown, introducing more and more killers. The John Wick movies are best remembered for Keanu Reeves' titular killer. However, over the course of the series, actors such as Willem Dafoe, Halle Berry, and Ruby Rose have joined Reeves in the underground world of assassins.
