Charlotte Abigail Lux

Charlotte Abigail Lux is a Human who became a Node.

Biography
Charlotte was the youngest daughter of Strackman Lux's grandfather, who built his dying daughter The Library and its hard drive to contain and embody her living mind, and a doctor moon to maintain The Library and her spiritual wellbeing (the latter task though its personification in Dr Moon).

In her perpetual dream, she describes to Dr Moon a world that she sees when she closes her eyes; a world that is later shown to be The Library.

In the world of The Library, the Girl is seen as a floating metal sphere that turns off and falls to the floor when the Girl opens her eyes on Earth. While The Doctor and Donna were in the Library, they came across this metal sphere, which the Doctor identified as being a security camera, although he told Donna after examining it that it was indeed alive.

The Girl came into contact with the Doctor through her television screen, where they engaged in a brief conversation which was ended when the technology malfunctioned.

Shortly after this encounter with the Doctor, Dr Moon came to have a talk with the Girl alone. Here, he told her that there were differences between the Real World, and the World of Nightmares. When the Little Girl said that she already knew this, Dr Moon shocked her by telling her that the Real World was false, and the World of Nightmares was real. He told the Girl that the people inside 'her' Library were very real, and that they needed her help.

The Little Girl then proceeded to 'save' Donna Noble, possibly killing the Doctor's companion in the process. The Girl turned to her father shortly after, telling him that "Donna Noble has been saved." It is unknown at the present time whether Donna Noble is alive, or dead. (DW: Silence in the Library/ Forest of the Dead)