Don’t let that long hair and fine features fool you; Final Fantasy VII‘s Sephiroth is definitely a dude. Crystal Graziano is definitely not.
http://kotaku.com/5878328/the-very-best-in-cosplay-crystal-graziano/gallery/1
The cosplayer recently tried her hand (sword?) at Sephiroth. The result, above, is Lady Sephiroth. And it so works.
OnPaperWings [DeviantArt]
(Top photo: BigWhiteBazooka)