User blog comment:CNBA3/Fairy Tail Zero 6 review/@comment-25572451-20141217184629/@comment-9595671-20141218110000

I agree, the two are close so its possible Zeira is a ghost.

Other than her and Yuri, all of the characters have shown up in the future. While its most likely that Yuri got really old its hard to tell, and you can't really say the founder picture proves she died since hre character probably hadn't been created by then.