Originally posted by Big D
I'm not entirely certain that Vincent is undead, though. This has been an enduring mystery in FFVII, but I personally think Vincent's still a living, breathing Human, albeit one with a few additions from Hojo.
i'd go with that as well. while he probably doesn't have any Jenova in him, he undoubtedly has been "altered" somehow. Hojo's note says so, that he is "scientifically altered."

as for Yuffie, i just saw her outfit and immediately, an image of Pippi Longstocking and her mismatched clothes came into my head.