I agree that humor from insults is something Fëanorians excel at. And certainly, in deciding that Caranthir will have the least opportunities for character growth or an arc over his time on the show, we have set him up to be laughable in his pride at times. I do still maintain that he ought not to be a comic relief character whom the audience is always laughing at. Because his death scene should still be tragic, not funny, when we get to that point. And seeing how Uldor is able to trick and manipulate him should be a natural progression of the 'flattery will get you everywhere' approach the dwarves have been using to manage him. In other words, his character flaws aren't funny when they are causing the defeat at the Nirnaeth Arnoediad.