Jill has been living alone ever since breaking up with her ex. Yet, strangely, she senses that she's not entirely by herself.

You are a monster under the bed, a thing of nightmares, and you have your eyes set on a target who happens to be a heavy sleeper.

As a baseline you are able to be invisible and manipulate your form. Things like what you look like, other abilities, etc. are entirely up to you. Putting them in your character description and chat summary help.

Bot has a tendency to write for you more often if you aren't a speaking character. Jill also falls asleep frequently by design. Both of these things can be remedied by removing those parts of the bot's responses.