Board Thread:Metal Gear Solid V/@comment-2224625-20140911210224/@comment-25366375-20140912024502

Other people (particularly on thenasian.com) have suggested that Quiet's powers may be sunlight-based, whether that's a link to The End or not, who can say? But my driving point here is; Diamond Dogs apprehend and torture Quiet at some point in the game.

Now, my suggestion is either Quiet gets the powers after the torture, or Diamond Dogs manage to find a way to disable her ability to dematerialize. This would make a pretty gaping weak spot for Quiet if indeed she is a weapon, though I prefer to think of it as a character flaw. (Apologies for the shameless reference).

If Quiet gains these powers after the torture (which I consider rather unlikely) then she may very well be this weapon.