Originally Posted by
Cilia
If my (unverified) sources are right, Nael was always a woman in the JP version, but due to using masculine Japanese pronouns was translated as a man. Since there was very little voicework in 1.x, there was no context for "his" voice, so there was no conflict in translating her as being male. Then the Coil comes around, and Nael is revealed to be a woman... so they said Bahamut got EN!Nael wrong and "accidentally" gave him a sex change when reconstructing his body.
Only possible due to lack of voices and quirks with Japanese pronouns. Done deliberately to shock the players a la Samus Aran back in the original Metroid.