For me, it's a tie between Klaus and Elijah. O_O If they want to add more complications and drama to it, then it's Klaus since they can't kill him. And that is their number one priority right now. And Elijah- that's just a gut instinct. :3

I don't know,but I was thinking that it could be Tatia ^^
It would be a good way to integrate her.

it all goes back to whom ever turned Rose because Katherine was turned because Rose tried to heal her but she hung herself which turned her and as we know Katherine is the one that turned Stefan and Damon so the question is more who's bloodline is Rose's? I don't think it would be either Elijah or Klaus she feared them both so I have no clue...i'm just guessing it's someone we haven't seen yet.

It couldn't be Tatia she was never a vampire. It has to be one of the original vampires. Maybe the person that turned Rose was turned by one of the original vampires. Rose was pretty old but she wasn't as old as the originals.

or Klaus

i'm just guessing it's someone we haven't seen yet.
In the end, it has to lead to Klaus, Elijah, Kol or Rebekah.

i hope it