[Granted, Ciel's first thought after Xion's explanation shouldn't have been "Sebastian, go steal the new person's black coat for me," but there you go. At least he has the presence of mind to realize that even if Sebastian stole the coat, he wouldn't know how to use it. Leaving it with this person for now is probably the best course of action.]
Someone with a strong heart. I wonder how you would define that. It's a pity that the dark passages won't work for you here. It would have been a sight to see.