Left in the Dark // Mike Wheeler x Reader

She was never supposed to exist.

Born in the lab as Subject 000, she vanished at five years old, swallowed by a rip in reality and forgotten by everyone but the monsters that shaped her. In the Upside Down, time moved wrong. She grew into something half-human, half-echo of the place she survived. A girl made of instincts, shadows, and memories that never stayed still.

Thirty-three years later, she stumbles back into the real world with the body of a fourteen-year-old and the mind of someone who has lived in darkness too long. Smoke fills the air. Sirens scream. The Starcourt Mall burns behind her.

And she sees a boy.

He doesn't know her name. She barely remembers what a name is. But he looks at her like she isn't a monster, like she's worth saving, and for the first time since the world split beneath her feet, she reaches back.

Now the Party must decide if this strange, silent girl is a miracle, a weapon, or a threat from the place they fear most. As old memories rise and new dangers follow her through the cracks, she has to learn how to be human again...
before the darkness she left behind comes looking for its lost child.