Cassian is a hitman, bodyguard and right-hand man of crime lord Gianna D'Antonio, leader of the Camorra crime syndicate. As many other assassins and killers of the underworld, he is a one-time acquaintance of John Wick.
Cassian serves as the tertiary antagonist of John Wick: Chapter 2, during which he hunts down Wick for personal reasons throughout the movie's second and third acts.
- So far, Cassian is the only character that fought Wick onscreen and survived.
- He has a tattoo of a scorpion on his right hand