@Everyone who has answered it so far still no correct answers. This is a very difficult one and as for a hint I will give you one in around 20 hours if nobody has gotten it.
@The Original Riddler, where the hells batman and robin when we need em the most.. But i think the answer is that awesome ending to a really awesome dream you had last week.
@The Original Riddler, Breath? I can see it, but can't touch it. I always need you, and you come. But if I need you most, I am probably being suffocated, so you won't come to me. Did I at least get close?
@The Original Riddler, Damn it. You're driving me insane. I'm ready to ask Facebook. I'd rather have the satisfaction of doing it myself though. If by tomorrow morning I still don't know, I'm taking to the interwebs for help.
@The Original Riddler, family, it would just be weird to touch your family, they are there when u need them, but you usually need them the most when you're older and the could be gone/dead.
@The Original Riddler, It has to be space... You can see space, but you cannot touch it. It's there when you need it, but when you need it most it's not there...
@The Original Riddler, The answer to your riddle is YOU, The Original Riddler. We see your name, but we can't physically touch you. You came in a time when we needed something to do in the comments section, so you came to us, but left when we needed you the most.
@TheOriginialRidder. IT'S HAPPINESS! You can see happiness but can't touch or feel it with your hands. You have it when you need it, but when you are sad and need it most, it's gone!
You can see me but you cannot touch me or feel me. I come to you in a time of need but leave when you need me most. What am I?