Love this idea. The Moogle weapons were funny, but not quite in the same way.
WAR : Stop Sign (or other similar road sign that's more Eorzea appropriate)
MNK : A pair of tankards
PLD : I have so many ideas for weapons for Paladin... Leek, Swordfish, French Baguette, Chainsaw?, and shields ; Wok, Doughnut, Training Potty, Lalafel tied to a plank (Love the cheese wheel, too!)
DRG : (Again, love the mop or any long garden tool!) Giant Q-Tip
BRD : Trombone with a string up the long part of the tube
NIN : Two pairs of oversize chopsticks, or a pair of any of the suggested PLD weapons. lol
WHM: One of those... Uh, body board things that lifeguards use. Dunno what they're called.
BLM : (Really like the lamp post!) Rubber chicken? lol
SMN/SCH: (The moogle book is already a pop-up book) A single piece of paper with the word TAKTIKS written in crayon and a couple circles and x's with arrows pointing in various directions
DRK : Surf Board? Held at the thin end, obviously... Or maybe a surfboard mounted to a small handle. lol
MCH: An obviously fake looking gun with a BANG flag coming out of the end (I know, not original, but I couldn't come up with something better! ><)
AST: Magic 8 Ball surrounded by Triple Triad cards
So many possibilities...