Revive: Merle, of course.
Safeguard: Glenn. Maggie can't take another loss and I like the little guy. He's a good husband, a loyal friend and despite some really insecure bitchy moments a steady headed kinda guy. Yeah, his character has been sidetracked a bit but he's still the dude that would save Rick in the tank, let himself be used as "walker bait" and survive. I really am fond of him.
Very well said, mamacita. Very well said indeed.