Ghost Girl

Ghost Girl is a ghost-like monster roaming the Haunted Mansion. She has nothing to do with Chrome's plot whatsoever, and acts as merely a hindrance. Chrome also mentions that Ghost Girl simply wandered into her territory.

Alice says that a Ghost Girl and ghosts themselves are different from one another because a Ghost Girl is born from a collection of souls mixing with magic power. Luka questions this, implying that he thinks it is more likely that Alice is simply making excuses to avoid facing the possibility that the Ghost Girl might in fact be a real ghost.

The difference between the Ghost Girl and actual ghosts becomes clear when Alice faints from having seen the real ghosts after Chrome is chased off - she realizes that these ghosts are different from the Ghost Girl.

Encyclopedia Entry
''A collection of human souls that was infused with magic. It prefers dark, damp places and avoids sunlight at all costs. Although her face resembles the face of one of the souls, she has no memory of any previous life.             Desiring nothing but the energy of living beings, it's difficult for her to communicate.''

''She needs male energy to maintain her form, so she will go to any length to get it. Her vagina has been changed to be as close to perfection as possible, as her continued existence depends on forcing the man to ejaculate. Unable to control herself once catching a man, she will continue squeezing him until his death.''

''Since she is a collection of souls with no physical body, physical attacks do not work. However, an attack imbued with the power of darkness is said to be quite effective.''