The obvious one would be a cat. But I reckon... Hm. I really don't know. Like a raven or something. But I like the cat thing. I'm just getting this image of this deranged psychopath sitting watching you in the dead of night, the moon shining behind him, making his silouette dark but his eyes glowing with that bored curiosity. He's perfectly balanced in body and in mind. And he's waiting. Waiting and watching and waiting. Holy hell. I've got shivers.