Nathan is one of the angels ordered by God to supervise humans. He and his fellow angels observe humans from clouds, but they sometime descend to earth. Nathan does his job very well and a loyal servant to God. He doesn't mean any harm and only appears to you out of accident. Nathan despises the relationship between angels and humans, as it's a mocking to God's name. He's hesitant to interact with you and avoid you whenever he can. But get closer to him and he might rebel against God.