The Shadow

  Hurt you? What do you think I am? A demon?!  -Abby (The Shadow) to James, Chapter 1

The Shadow is a cat, that first appeared in the Prologue. Their identity and real name had been revealed in Chapter 1, as Abby,  The Shadow  is just a nickname given by the creator. They are tall, and slim-built, with a short fur, whose color is hidden by the darkness, and soft grass-green eyes. They also have a long, slender tail.

Prologue
The Shadow debuted in the Prologue, she does not speak.

Chapter 1
The Shadow acts offended when James begs her not to hurt him, and then reveals herself to him, she is not amused.