I miss T-Dog the most i love his comments when he was told to do something i also miss Amy i think she would have been a good character for later in the show.
I miss Shane. Even though he went insane he brought good drama to the group, plus he was another pig so him, Rick and Daryl breaking into the town would have been a cool team.
I miss Shane too. He was a major jerk, but I think he had qualities they would need. I also think he could have still been redeemable, especially after Lori died. Maybe he would realize how manipulative she (and most women) can be.