Re: If Daryl or Rick died.....
I don't think you can lose Rick. Everyone else is probably at least a little expendable, but Rick is the heart and soul of the show.
Casting the DC Universe
Green Lantern/Hal Jordan: Jason O'Mara
Nightwing/Dick Grayson: Jack O'Connell
Zatanna: Jessica Szohr
Poison Ivy: Alexandra Breckenridge