Markie

Markie is the major character from The Twilight Zone episode, Nightmare as a Child. She is a girl who intends to find the source of the troubled past of the schoolteacher, Helen Foley.

History
Helen Foley comes home one afternoon to her apartment and meets a young girl, Markie, sitting on the stairs of her apartment building. Markie is an odd child with a deadly serious manner. More disturbingly for Helen, Markie is strangely knowledgeable about Helen and about Helen's past. The child demands to know about Helen's past, and about a terrible trauma Helen suffered when she was a child.

Personality
Markie is a strange and very serious little girl who tries to find the problem for Helen's traumatic experience. However, despite this, she wants to help Helen recover her memory of her past and learn who her mother's killer was. In fact, it is revealed that Markie ultimately has good intentions, despite his bizarre traits.