The Shoutbox
Fridge Largemeat.
Slab Bulkhead.
King Crosspatch.
Pissy Windbag.
At this rate, it's going to be Pest Control.
King Misanthrope.
Whiny Sourpuss Murmurer.
Curmudgeonly Gripe Master.
Killjoy.
Bellyacher.
That could work. Doesn't have much of a ring to it, though.