Here is a design from our long running fantasy project.
A Faeri messenger, they are short, between 4 and 5 foot, they are also delicate brittle creatures.
But the words they carry are oft of grave import and they are chosen because they are wicked fast and pitiless if drawn into a fight.
A human could snap the arm of a Faeri like a twig, but he would have to catch her first. Which is no mean feat.