We must clearly declare Celes the winner of this title. This can only be understood by comparing the plot driving of each character. Most often we think of Terra as a main catalyst. She causes most of the action to occur in the World of Balance and many of the plot twists are revolving around her... right? well it may seem so but Celes is always, well after we get her, allowing such polt drives to go forward... The Opera leads to our getting to the Magitek Factory, Celes's knowledge and affiliation with the empire get us to be freed from the empire so we can go talk to the Espers and also to Thamasa. Lastly we also have a need for her when there is connections between magic/expers/Terra. It is her that gets many actions to get done. Then in the World of Ruin she is the one that starts us off, follows Edgar, and turns Setzer to come back onto the field (and only these characters are needed to complete the game). Also, Locke is in love with her! :mog: