FFVI - Children of Vector

That is a good question. One would think, that being raised by the evil emperor, Kefka wouldn't need to use the slave crown... But what I'm thinking is that maybe Terra WAS raised to be evil, but Kefka put the crown on for his own purpose... to control her personally, rather than to just make her be evil. Something he kept from Gestahl, even. And once her memory was gone, she learned to be good.