Of the choices given, I remember that I was pretty taken aback by Rydia's return when I first played the game. I knew that something had to happen because of the way the fight with Golbez played out, and it was inevitable that Rydia would return because Yang and Edward had, but I never suspected she would return as an adult. The part where Cecil changes to a Paladin to better confront evil was also great, although highly annoying when he was faced with his dark self because it took me a while to figure out what to do. The part with Palom and Porom sacrificing themselves was unexpected for me, due to them being young children. However, Rydia's return gets my vote.