I'm hoping Gilgamesh is comic relief, threatening, but comic relief. I guess chicken Enkidu might be a sign he's a bit comic relief.
To be fair, there are a lot of NPCs with funny dialogue, like the sleeping male lalafell in Drybone dream-talking "Take me, Raubahn... I am your sultana..." And I guess the Godbert quests in Bronze Lake were kind of amusing, even though the Hildibrand quest copied the oiling gimmick.