I was wondering about the different spellings of his names too. Cuz Fye does seem different in pronunciation than Fai. Fai seems like the English way to spell it though, so is it maybe that Fye really is pronounced Faye in another language, and thats why they translated it like they did? ... i dunno if I make sense.
Anyhoo, I do love Fai sooo much. You can tell that under his playful face he has many secrets. Still, for such a mysterious background (and it seems so dark too), he can make so many jokes and be so lovable. <I especially loved when he gave everyone names in the Country of Oto> ...He's very sexy too, I think (creepy, but yes).
^_^ I havent seen him in the episodes though (because I havent seen any of them), is he different in them? Like, do they change his importance or role any?