This one obviously doesn't come as too much of a surprise. Tyrion Lannister stands at 4'5''. But when you measure the characters' heights based on the actors who play them, things start getting shocking pretty quickly.
And he's shorter than his sister. Sansa Stark is 5'9''. She absolutely towers over her little sister. Yet, Arya still scared the s**t out of her this season, so height is really just a number in Westeros.