I would really like to have played with all of them, but... I suppose the Santa one. Just because Ari enjoyed getting me into parties where my guild members were all silly little bearded angry fat men. *fond memories*
But as far as looks go, i suppose that neat/ bodacious valkyrie(i am assuming) you were morphed into when i last saw you in game. The one with the cloud strife style wing? Yeah, she is pretty cool.
Courtesy of Emralyn, Lalaheat & filipvarga