Leatherhead
Possibly a Idiot.
Nilbog (VGtM)
Nilbogs are yet another metaphysical oddity presented to us in this book. When Maglubiyet killed the goblin gods (save for Khurgorbaeyag) he didn’t quite account for exactly how hard it is to get rid of a god permanently. As a result, an unnamed trickster god had their essence shattered, but not destroyed or subsumed. Instead these shards of essence find their way to where goblinoids gather, and sow chaos against those who goblins would call their masters. Fey Courts who have goblins in their service often employ a goblin jester (who gets free license to do as they please), just to ward off the wrath of a Nilbog. Because killing a Nilbog is an arduous task to say the least, and even then the Nilbog will just possess another goblin in response.
Nilbog is the pseudonym to both the spirit possessing a goblin, and the goblin being possessed by said spirit. Names are a tricky thing, especially for fey creatures, and the goblins will not give a proper name to the unnamed trickster god, lest Maglubiyet somehow weaponizes it.
As fitting for perhaps the trickiest of fey creatures, a Nilbog is kind of hard to pin down. They are simultaneously some sort of jester (which implies bard) and an agent of a god (which implies priest). However, said god isn’t very godlike anymore (which could imply a warlock), and yet again they are also the spirit possessing the Nilbog (implying a divine being). Personally, I would love to see Nilbogisim as a Player Option in the form of a Subclass perhaps. It could be a campaign in and of itself to restore and empower the nameless trickster god back into full divinity.
Or if you want to ignore all of that, you could simply use a Nilbog as a magical clown. Everyone is terrified of magical clowns, and for good reasons.
In combat, the Nilbog is a frustrating combatant. Any creature that is attempting to harm them must save VS charm or spend their action praising the Nilbog. Furthermore the Nilbog can use their reaction to negate all of an attack's damage, and instead heal from it. For offensive options, the Nilbog has Tasha’s Hideous Laughter, and the Mocking Word attack (Which is the first instance of Vicious Mockery being turned into a magical attack! I knew they could do it!). They can hide or disengage as a bonus action, allowing them to get away easier. I honestly wish they had a bit more HP, if only to properly utilize their reaction healing power.
In the changeover, the Nilbog lost the Confusion spell, and had their Vicious Mockery spell swapped for the Mocking Word power. They were also changed from Humanoids into Fey creatures.