Humor as Character
The funniest moments in fiction come from character behavior under pressure, not from jokes. A character who responds to catastrophe with inappropriate precision, who maintains a rigid social ritual while everything collapses around them, who is earnestly, magnificently wrong about their own situation — that is where sustained comedy lives. Wit reveals who someone is. If a joke could be told by any character in the book, it is probably not doing enough work. The best comic moments are so specific to this character that transplanting them to another character would break them.