Out of the ones you listed j-man due to the fact the rest of the sannin are alive. If not him, then Konan so she could have seen what became of Naruto who her and Nagato came to believe in.
I also would have love to see Ten-Ten die and them show something cool with Neji and the byakugan. I...
I really wanted that as well i liked Itachi as the bad ass villain but it didn't surprise me to realize how nice he really was with more and more of the flashbacks we saw.
PS: One of my biggest issues with Sasuke was the fact that everybody kept saying he'd regret trying to kill his...