In his appearance in the movie, Luke is a friend of Jocelyn. He has been with Clary's family since her childhood. It is told that he loves Jocelyn and spends his life to accompany her as a fugitive. He is also the member of the Circle along with Jocelyn and Valentine. Luke is the name for his disguise. His real name is Lucian Graymark. In the incident of Jocelyn abduction, he pretends to not care about Clary and her mother to protect them. Luke is a werewolf. He tries to protect Clary in several events by turning into werewolf. Clary accidentally hurts him with a knife because she does not know that the werewolf is Luke. He comes with his pack to save Clary and Jocelyn.