What are some of your favorite "niche" weapon rolls?

I had tons of fun using my beacon rounds / Osmosis Indebted Kindness with Gyrfalcon Hunter during Season of the Wish.

I've been trying to chase the same fun this season but I'm short on time to experiment due to work related reasons. Can you recommend some niche weapons or builds to try?

Edit: thanks for all your suggestions! I'm going to start with the craftable ones first and then move onto the ones I can actively farm, although the double discord shotgun catched my inner Doomguy's interest. So that might become top priority for now.