Everyone meets Death at least twice. Once when they die, and once when they are born - but usually no one remembers that meeting. And there aren't any silly rules that govern her job. She can take people or leave them as she wishes, and is very good at her job. Now, take out your mental image of Death's personality, and burn it.
Death is cheerful and loving.
In fact, she loves everyone. She watches Disney, and quotes Mary Poppins. She feeds the pigeons and gives advice about living to her little brother, Dream. She's just precious. Duo is the most cheerful and alive of five fifteen year old boys who strike out from separate colonies, to save the freedom of their homes from the oppression of war.