This is fun.

WAR The level 81 dungeon (I think) has a circular saw on a stick. Steampunk/Bloodborne looking weapon. Tied with the Titan savage from ShB. I love it. DRK has similar but as a huge chainsword but I will pick something else for it here.
GNB The new 760 Penumbra honestly.
DRK Has an actual huge kanabo (japanese studded club) that I love. It's truly amazing.
PLD Excalibur hard to beat tbh.
MNK Sephirot EX weapon. Both original and the glowing one, both fire.
RPR Just got the new relic so biased towards it, if not, the figmental is pretty good.
DRG The faust rod, buy it with your MGP
VPR 760 figmental