Board Thread:Speculation House/@comment-64.113.177.152-20150121173112/@comment-25801533-20150316013225

Penny, although she is a war machine designed for certain situations, was also able to see through blakes disguise aswell. On that note, Ozpin too, knew that she was a Faunus. As to how Sun knew, I have no idea, nor do I know if Faunus can tell each other apart without seeing the traits of the other Faunus.