I don't look like any FF VII character, except a dead Aeris when I haven't slept enough.
But if I could choose to cosplay ANY character I'd love to do Tifa, Yuffie or Vincent. Yep - there are a lot of girls cosplaying Vincent out there, just like almost every single Vampire Hunter D or Alucard cosplay in Japan is carried out by girls. It happens when a male character is long-haired and quite feminine (I once met a girl cosplaying Sasuke of Naruto, though.)