Board Thread:Speculation House/@comment-14138255-20140815002519/@comment-209421-20140818143717

Kuro Neko00 wrote: As a side note, I was reading the wiki entry on Sun and it theorizes that Sun's recognizing of Blake's species is a power unique to him, since the character he's based on had the ability to see through disguises. While that's certainly possible, the fact the Blake doesn't seem to show any surprise that he knows nor any attempt to deny it implies to me that she's aware that any faunus that looks at her closely will figure it out immediately.

Ozpin figured it out, so I'm not 100% sure I agree with the Sun comment.