There is an alternate of everyone in each dimension, except for the immortals. They all have the ability to travel through worlds, so they do not need to have their souls reused(ish).
Yue's dimension was destroyed, COMPLETELY. I mean, it is GONE. The whole dimension. She came from the Naruto world. XD If you don't know what Naruto is, don't worry about it.
Well you always appear for like, day(s) =P but it still sucks
And if everyone has an alternate self, does that mean there is a Raike in Yue's original dimension? and what happened there? Damn space time continuom is messin with y head -_-'
Hm, not sure if you understand, the Yui that was hanging out with your group (the one with blond hair and blue eyes) isn't with you guys right now. She's still in a clearing with Silver. The Yui you are talking to (with black hair and black eyes) has been with Penelope, Cal, (who both died) and Odile. Wow, mate, fail. XD