The Star of the show, often described as being very melancholy and far different from other Angels, she is the Princess of Heaven and is the first ever Angel Born in Heaven, both in a good way and a bad way. 

She is the first Angel to be produced via a Grim Reaper Assistant and their Angel respectively which leads to discrimintory remarks and worrisome glances towards Heaven's family. 

The Angel of Death gets her name from everything she touches dying. This is also brought up when she is sent on her first assignment, to guide a human, she is unable to protect said human because she is afraid she might kill the human.