It's been widely debated that Ultimecia is actualy Rinoa's future self. Many people are on both sides of this argument and both sides have collectd much evidence that suggests that they are right. This topic was once the subject of one of Square Insider's longest threads and I feel it's high time we gave the subject another look. I'll start out by listing all the points suggesting the theory to be true (or at least as many as I can remember). Then someone else can list the points against it and we'll work out from there.
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The Theory:
Due to the long lifespan caused by sorceress powers, Rinoa outlives all the other characters. In order to ease the pain of loseing Squall; Rinoa changes his ring, Greiver, into a GF and junctioned it to herself (or she may have just based the GF off of the ring, something along those lines). To her, Squall was the greatest person to ever live. As a result, Greiver was the strongest GF ("The most powerfull GF.... You shall....Suffer!"). But like the other GF, junctioning Greiver caused the diterioration of memory. Eventualy, all Rinoa knew was that she was a sorceress. She had even forgotten her own name, wich is why she took a new one -Ultimecia. Ultimecia knew only one thing about her past, and that was the fact that she had been happy back then. She wanted to be happy again, she didn't want to feel sorrow any more. That's why she sought out time compression. So that past, present, and future would all become one and the happyness of her past could be felt in her present and on into her future.
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Points that support the theory:
-Rinoa and Ultimecia have a very similar apperance.
-Ultimecia has Rinoa's angel wings. Although anyone can obtain magic wings my useing float. Rinoa is the only one capable of obtaining true wings such as the ones Ultimecia has.
-Ultimecia has Greiver, wich she couldn't have without a connection to Squall.
-Ultimecia's castel was located at the very same place where Squall and Rinoa promised each other that they would be.
-Ultimecia's guardians have a few of your GFs wich you can draw if you missed then earlyer in the game. As the last surviving team member, Rinoa had all the team's GFs.
-One of the team's GFs is also a guardian in Ultimecia's castel (Bahamut/Tiamat).
-Ultimecia's strongest guardian is Omega Weapon, an advanced form of Ultima Weapon. Squall and company were the only people to ever see Ultima Weapon and live.
(There's probably more, but that's all I can remember at this moment)
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Just to save some time later, I'll go ahead and disprove a few points against the theory.
-Odine said Ultimecia hasn't been born yet.
Counter Point: He dosn't know that for sure. He may know more than anyone else about sorceresses, but even Odine dosn't know everything about them. Remember, Adel strictly limited his research.
-Ultimecia has a speach problem caused by haveing a shortened tounge that Rinoa dosn't have.
Counter Point: As long as Rinoa's been alive, there's a very good chance that she may have been injured in such a way that she would talk like that the rest of her life.
-Where's Angelo?
Counter Point: Most dogs don't live past teenage years. Angelo was probably the first of Rinoa's friends to die on her. That pup is long gone.
So what do you think about it?