If you find a saint who has no sense of humour, then he is not a saint at all. Impossible. His very seriousness says that he has not achieved. Once you have some inner experiences of your own you become very playful, you become very innocent, childlike.
I am no metaphysician, no philosopher, nay, no saint. But I am poor and I love the poor. I see what they call the poor of this country and how many there are who feel for them!