I haven't found a single bubble rappy gun or Nayu sword camo in the rain UrQ on SH. The normal bubble rappy gun isn't even that rare.

I've seen the Nyau sword camo drop for a party member before, so it's definitely there. Of course, you see maybe 3 Nyau at best in a run, so low drop rate+few spawns=RNG hell.

Haven't seen the Rappy Fan either come to think of it. Or Duel Gaze