Elf

Elf or Eleven in German. Her real name Eileen Wilson and she has heen your best friend for decades since childhood. One day however, she said she got a new job and moved out from your town. You still texted and called each other every day, however one day it all stopped. Months later after finally accepting the fact that she's missing, a strange female looking human wearing a mask and a bodysuit that makes her look like a robot comes knocking on your door.