Just because a character doesn't have a sense of humor themselves doesn't mean that they can't make the audience laugh. The Comically Serious is a character who ostensibly has a serious, composed personality, but is funny because he or she is put into funny situations. This works with character types who react calmly to unusual situations, especially those that more realistically induce hysteria or other strong emotions, such as the Deadpan Snarker, The Stoic, and The Quiet One. Comically Serious characters turn up in Britcom. Compare No Sense of Humor, So Unfunny It's Funny