I just like how she's from "the future" like the writers had no idea what they were talking about. Is she gonna be around a couple decades from now, a couple centuries a couple millennia...?

Then again, given how the entire world forgot the most powerful civilization ever (the Centra) in less than a 100 years, Ultimecia could pop up in 50 years and that would be insane and incomprehensible to people.

Really, Adel makes the most sense as the main villain. I have no idea why anyone wanted to bother with time travel. Ultimecia's entire "character" is founded on about three lines of dialogue while she was possessing Edea and that is the only reason anyone can even guess at her motives. It's truly bad writing.