Luke Garroway
Quote 1
"I loved [Valentine] too: He was my closest friend, and I was happy to see Jocelyn with him." (21.10)
Luke talks about his love for Valentine in past tense, so we're pretty sure he won't re-join Valentine's cause the way Hodge does.
Luke Garroway
Quote 2
"Faithful unto death." (22.89)
Here, Luke is translating the NYPD motto, Fidelis ad Mortem, for Clary. It echoes the Shadowhunter motto, don't you think?