Koa-kuma. haha, this never gets old. I'm not a Persona guy, but was P4 all about their glasses?
It wasn't ALL about the glasses but they do play a big part in persona 4 allowing you to see through that fog that stays around the entire game. They are more iconic than anything discounting their main function their one function, you could technically go through the entire game with and barely notice the glasses. Still they look rather good and they are easily recognizable symbols of P4.