Fifth personality, is the sister of death a man or a woman?

This is a very novel setting in the game "The Fifth Personality". Although everyone calls him Sister Death, his gender is actually a boy, which gives people a handsome contrast of sand sculpture.

The Fifth Personality is a mobile phone game. At present, the story of burning brain has welcomed a large number of gamers because of its unique and exquisite pictures. It is a non-competitive game developed by Netease.