DIANA FROM LIGHTS OUT SKIN

Even before he started being terrorized by Diana, she seems to have been a part of his life, despite her feud with their mother, appearing in a picture with him where he has on a Halloween costume. Cool Big Sis: She cares deeply about her brother and is always there for him, as well as doing smaller stuff like helping comb his hair.Rebecca: (to Martin): I'm going to tell you something no one ever told me. Was Once a Man: Previously an anomalous but otherwise perfectly human little girl, now a warped, insane abomination.Would Hurt a Child: At first, she seemed more fine with scaring Sophie's children, but it escalates to that point.Even though she was a definite head-case while human, when we see her later post-transformation shes now nothing more than a feral beast in both body and mind. With Great Power Comes Great Insanity: Implied.Villainous Breakdown: Dashes at Sophie in a distressed, angry fashion when she was about to shoot herself.Stringy-Haired Ghost Girl: Obviously inspired by this trope, Although it's unclear is she is an onryo, Her hair is mostly obscuring her face and is a Eerie Pale-Skinned Brunette which envokes this trope.Living Shadow: Became this after her death.It Can Think: Lures the two kids into a trap, and had written sadistic messages, taunting Rebecca that she was the one who murdered her father years ago.Humanoid Abomination: Before her treatment, she was but a girl, albeit with Psychic Powers, an extreme weakness to sunlight, and a sick sense of humour, but afterwards, she became a disfigured, parasitic and deranged Living Shadow with murderous, bestial urges who anchors herself to the world of the living by fostering and feeding upon madness.This is probably caused by the damage of the vocal chords caused by her exposure to bright light. Evil Sounds Raspy: When she talks her voice is hissing and guttural.She drove her father to commit suicide, became a Poisonous Friend to Sophie and eventually broke her legs. Enfant Terrible: The experiment only turned Diana into a literal monster as a child, she was already cruel and sadistic.Creepy Child: She caused her own father to kill himself from her mind games.Cop Killer: Killed the two police officers called to investigate a disturbance.Control Freak: She maintains an iron grip over Sophie's life, killing or driving away everyone else until it's only her and Sophie.Can't Live Without You: After the experiment, Diana is tied to Sophie and can't exist if she isn't in the throes of her mental illness.Big Bad: Of the film, and is stated to also be the main antagonist of the upcoming sequel despite Sophie committing suicide to save her two children from her.

Berserk Button: Trying to help Sophie with her illness immediately sets Diana off, and of course she reacts violently to the light.

Ax-Crazy: She inflicted a Psychic-Assisted Suicide on her father for shits and giggles, grievously wounded Sophie after hearing that she was to be released, and after her death and transformation, became little more than a feral beast maiming and slaughtering all in her path.

As such, their relationship is rocky at best with Diana benefiting from Sophie's misfortune, to abusive when Sophie's children come into the equation.

All Take and No Give: Diana only exists in the physical world due to her parasitically feeding on Sophie.

In the original short film, however, this only seems to be the case, until the very last shot of the film reveals she has no weakness to the light whatsoever.

Adaptational Wimp: The fact that she can't exist in the light is the crux of the entire movie.

It's up to the viewer which one is scarier. While a freeze-frame bonus show's Diana's true form to be that of a nightmarish hag, the original short film's counterpart seemed to be an otherwise normal woman sporting a HELL of an Uncanny Valley Nightmare Face. She died due to an experiment going awry, and her spirit had since latched itself onto Sophie.

DIANA FROM LIGHTS OUT SKIN

A young girl with a skin condition that Sophie met at a mental institution.

Diana from lights out