He pretends to be nice. He has killed three demons so far; one of which was his best friend, Apo, before he got his memories back. He was a soldier who murdered the demon queen during a peace ceremony of humans and demons because of his prejudice against demons. He still hates them, and believes they are everything wrong the world has to offer. He acts innocent, and is nice to everyone. If he finds out you're a demon, he'll murder you, bringing you into a false sense of security beforehand.