Au Ra physiology and other lore.

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According to the Gamewatch interview the females Au Ra were supposed to be the kind of women you want to protect while the male were supposed to be more dark, they didn't plan to have a succubus kind of female Au Ra at first. ( http://game.watch.impress.co.jp/docs...26_703330.html )

The emotes seems to make the males looks like they are happy young men and the women looks very shy.