It's always the creepy little kids
They came upon us suddenly, no sound preceding them until the splashing of their feet drew our eyes towards them. The wolf-things neither howled or snarled as they tore into our ranks.
How about a dragon how cheerfully rules over a kingdom; his people all know him for what he is, and dragons are looked upon as wise and benevolent creatures. Dragonslayers from other kingdoms coming to free it from 'tyranny' are likely to get beaten to death by peasants with cast iron skillets.