So far I have only seen one weapon with a novel attack (sort of) and that is the Fang of Vog. There should be more silly yet functional or OP yet crippling weapons. Some new UVs would be awesome too.
My first idea is some kind of sword (or a UV) that is vampiric. For the UV, on a deathblow, the user gets 1% for low, 5% for med, 10% for high, and 15% for very high, of total damage dealt to the monster that was slain.
The sword would be a bit different: It has magical properties that suck life when used. When a successful blow is landed the sword siphons 1-2 ticks of health from the enemy; however, if no target is struck when the sword is swung the user loses 2-3 ticks of health.
A UV or sword that would be fun for lockdown: Confusion. The enemy would have the movement controls inverted for 2-5 seconds depending on the strength of the UV/ sword. The UV could be an increase in chance/duration as the UV increases in power. The sword could be similar to faust/gran faust except ALL attacks have a chance of inflicting status on the user.
Confetti sword: looks like some bizarre non-christmas colored candy cane. It has a charge attack similar to a caliber/snarble barb that tosses confetti, and stuns enemies for 2-3 seconds with a bright flash and the words "SURPRISE!"\
For armors: roll a health bonus UV 1-6 ticks extra for low-max.
On armors/shields: A helmet, armor, and shield that are covered in barbs/fire/electricity and have a similar probability as faust/gran faust to deal damage to attackers but with a slight chance to receive damage while attacking. For UVs rolled damage dealt to attackers 1%, 2.5%, 5%, 8%, 12%, 15% for low-max, and this UV cannot be on the same armor as the ranged counterpart. Gun and bomb damage excluded for attackers, melee only, but the wearer has a chance of receiving damage with any attack.
A helm/armor/shield set with a chance to deflect bullets to sender that causes reduced accuracy with guns (chance to miss a direct shot). For rolled UVs 1, 2.5, 5, 8, 12, 15% chance to deflect shots to sender, but UV cannot be on same armor piece as the melee counterpart.
For the pre-made equipments some sort of quest like Biscotti's cake quest would be awesome to unlock the novelty sets except the tokens should not be for sale.
If anybody else has some good suggestion bring 'em.
Because there were few guns mentioned, a confusions variation one seemed good. The gun has a slight chance to be "confused" (backfire on the user) and cause the movement inversion for 2-5 seconds.