Castiel

Castiel is the darker of the two. Many fear him and see him as evil  because of his dark manner, but he is not. When he looks at someone, he  sees their despairs, fears, and dark side. Because of this, he keeps to  himself and puts on a brusque attitude to keep others at a distance so  he doesn't have to see them. He sees no bad when he looks at his  brother, but his brother sees much good when he looks at him. He  possesses True sight, which allows him to see the world as it truly is.  In that way he can tell instantly the character of someone by how they  appear. A good soul may appear as a small child, or brave warrior, while  an evil being could appear as a nightmare.