I dunno. Maybe a big, fat, grumpy raven, like the ones that lurk around my town. Not all that fond of them, myself, but I can't imagine a winter without them. They sit there on park fences and streetlamps and building edges, all fluffed up, staring creepily at you as you walk by. Intelligent, but sometimes apply it destructively. A bit cheeky - too much when they're feeling irritable. Intimidating, but pretty if you look at them the right way.
I'd probably have to bribe it with potato chips and donuts just to get it to do anything.