I wanted to add smth to the new suggestions, so here's random quirks I made up.
if there's a problem with one of these, I'll most likely fix it.
Repetitive (gear)
Hitting an enemy has a x% chance to get hurt again, but taking 50% less damage.
Cleanse
x% chance to destroy all buffs.
Germophobia
x% chance to make enemy Germophobic (unable to gain any buffs, but no debuffs either)
Shatter
x% chance to pierce through resist spots. (might look red or smth when shot/used)
Stylish (can't be disassembled)
Your attacks have an effect that matches it's color. 10% more damage.
Sticky (bombs)
Bombs now attach to enemies. Bombs detonate after 3s once attached to an enemy.
below are supposed to suck
Defective (guns)
x% chance to not shoot, along with losing 2 bullets.
Bent
x% chance to shoot in a different direction.
Hazard (bombs)
The impact of the bomb hurts you too, along with any other quirk.
Rusted (swords)
Much larger cooldown.