Not the GP, but I think there's a difference between a leading character who is inherently humorous or says humorous things vs the narrator doing it. And in cas

Not the GP, but I think there's a difference between a leading character who is inherently humorous or says humorous things vs the narrator doing it. And in cases where the narrative is first person from the perspective of someone in the story (mostly famously The Murder of Roger Ackroyd), it should remain relatively flat and observational rather than being puffed up with a lot of that character's thoughts, opinions, or personality.