So how to use humour in fiction? It can be a great characterisation device. If you say someone has no sense of humour, doesn't that conjure up in your mind's eye an immediate image of what that person is probably like? (You may not necessarily be right, of course, but you will have that image. I know I do).
Also the type of humour your characters like/come out with themselves can give added depth to their portrayal. Those that like subtle irony (think Elizabeth Bennett from Pride and Prejudice) are a world away from those characters who prefer outright farce.
So what kind of humour would your characters like/come out with? Humour can be a good way of differentiating your characters for your readers too. They will come to know Character X comes out with this kind of joke, Character Y hates that and prefers one-liners etc.
Have fun with your humour (!) as you write your stories!
Image Credit: Image below is taken from free to use site, Pixabay.