@TohruAdachi: Nahh it's okay - like I actually have no idea what you're talking about in general. I did a great job of not spoiling anything that P4G added, just so that I could have a fresh, surprising experience like I did with the original P4.
If you don't know already, the Cafe gives you skill cards from the persona you have equip. Also go to the cloth shop every so often to get new costume. Also vending machine here have Persona figures to put on your shelf so get to it!
Yeah I've only gone to the cafe once so far, and I've bought every costume available so far except for the swimsuits (well, I got Yukiko's... eheheheh). Haven't looked at Teddie's costumes yet though, my last save was just after Shadow Teddie.