2) Melisandre
Most fans are in agreement that Melisandre will resurrect Jon Snow, so at this point, the bigger question is whether the Red Woman will survive the process. In fact, some are going as far as to speculate that when Melisandre got into bed defeated at the end of the season premiere, she was preparing to die in order to revive Jon Snow.
That seems like a stretch, but the show has driven Melisandre to the point that she thinks all is lost, which would put her in the optimal position to sacrifice herself in hopes of redemption. The final scene of the season 6 premiere does not exactly present us with a woman who feels that she has much to live for.
The only possible setback to this theory is the season 3 scene in which Melisandre runs into Arya and tells her, “We’ll meet again.” What would be the point of ensuring these two cross paths if not to set up something down the line? It would be quite the fake out if Melisandre dies and never sees Arya again, but this series does love to mess with us.