In my story Sybil, the main character, is 5'2. She's not too short but she's not tall.
Then you've got the other main character, Cyrus, who is 6'3.
Arguments between them must be hilarious, just a tiny woman condescendingly speaking to this large, frustrated, mountain of a man who is trying not to shout.
Just
Tiny ball of cold fury
vs
Mountain of hot anger