As per the advanced review clue that a long gone character would make an appearance, here are some people I would love to see make a comeback because they could provide more insight or because their is more about their story I'd love to learn...

Brenda Shettrick-  the dirty reporter who gave intel to Tommy Volker has some 'splaining to do.  Is she really just going to get away with all of it?

Alex Jane- I just want to hear more about Patrick Jane's past, specifically, whatever became of Patrick's mother?  We've never heard anything about her, not even a mention.

Rosalind Harker- you all know you want to hear from her again, especially those of you who recommend she pat down the suspects in a lineup.

Lorelie Martins- I've always suspected she wasn't really dead.  How the body of the supposed Martins was laid out in a carnival scene just screamed red flags!

J.J. LaRoche- he gathered quite a bit of intel while investigating the burning detainee at the CBI, but we never learned what he discovered.  He just disappeared.

Walter Mashburn- so he can be killed off and people stop saying he's Red John.