I feel like Aaron would be almost immune to Infinite Sorrow. Why? His worst memory happened before he even had a memory (his parents throwing him out on the street), so he'd at least be able to counteract it a little. Jace and Zinnia are screwed though. Like seriously, one would just end up a crying ball on the floor and the other would become too enraged to actually aim anything. EDIT: Speaking of which, Jace is still in the cafeteria! Fun times!