The White Mage is the same sex as Gogo! My real answer though: I say female. Every other game in the series has female and male playables (well.....except X2). In 4 and 9, Square decided for us each character's job. They made Garnet, Eiko, and (the ever annoying) Rosa white mages, or something similar. Thing is, they probably designed these characters vaguely so that they could be either one. All things considered, it doesn't really matter, but it's fun to talk about.