I'm not really a huge fan of any of these, but I'll have to go with Narga, because I think her costume is the highest quality, and she put the most effort into being authentic (especially with her hair and eyes/contacts.)

I don't like Aeris as a character or in battle. But, I do really love her character design, so I don't mind seeing a cosplay. Can't wait til you get the next article up, Auly!