Hojo will be delighted to test out zombie breeding.

Spira will be an interesting place after the outbreak. Two if its main leaders are already technically dead after all. They're not zombies in the strictest sense though.

The various Cids will doubtlessly be the ones who save everyone. They take the survivors to the air in their ships and keep them away from the infected below.

Dr. Cid might have a most expedient solution to zombie outbreaks in Ivalice - nuke 'em all.