
Originally Posted by
champagne supernova
2) Their personalities are completely different. Rinoa is bubbly & warm, happy to live in the moment. Ultimecia is dark & broody & depressed & so scared of losing something she'd rather be alone (sounds more like Squall than anybody else). From a literary perspective, there is no way such a change would occur. Why would they (being Square) build up a character in such a way, when we are supposed to infer that she completely changes?
3) Many people who propose they are the same person suggest that the reason Rinoa became evil was because she lost Squall. So: why does she constantly try to kill him? Both as Edea and herself. Why does she want to be completely alone? Surely she'd want to be with Squall.
4) This is tied into 3. Proponents of this theory also say that Rinoa's line in the Ragnarok, which she says this moment stayed still forever, is linked to Ultimecia saying time doesn't stay still. Same argument as 3. Why choose to compress time so only she could exist if she could rather be with Squall? Surely, if she was so depressed over Squall, she'd rather die than be alone for all eternity.
5) Ultimecia can go back into time and possess different sorceresses. Again, if Rinoa is Ultimecia, why didn't she possess herself to protect Squall.