The mysterious Yuffie look a like ninja has been added to the characters page on the official site.

http://www.square-enix.co.jp/games/ps2/dcff7/

I think this adds more info of the ninja being Yuffie since Cait Sith and Reeve are on the characters page.

Azul is also on the page and he's a new character.

We've been discussing this in the "Yuffie in DC" topic, and it does seem that in fact it is Yuffie comparing the boots, weapon and the glove on her left hand. ^_^ :yuffie: