Lizzie is a supernatural character who appears in Companionship and is mentioned as a crucial character in My Children. She also appears as an antagonist in Dumb Dead Brother.
Lizzie is a young woman who, based on the opinion of Companionship's narrator, is outwardly unattractive. She apparently possesses an ability to coerce others into doing what she asks. The narrator of Companionship likens it to the pheromones of a predator insect. In My Children, Lizzie is similarly mentioned as having somehow insinuated herself into that narrator's life, against his own better judgement.
Lizzie is described as having short black hair and being slight of build, with large, pale blue eyes.
Lizzie sees herself as a caretaker of other similar supernatural entities, which she apparently takes good care of in a decommissioned government facility of some sort. Said facility is buried and concealed beneath a run-down trailer in the middle of nowhere.
Though seemingly not violent herself, Lizzie seems to have no reservations about letting the entities in her care do what they will to others. She values anomalous entities above normal beings.
In I Hate My Dumb Dead Brother Again, Lizzie is shown to have been "property" of The CRP Institute in the past. This is likely where she first began her attempts to liberate and/or collect her "pets". She wears a necklace depicting a Gordian Knot, the symbol of the CRP's strike team, indicating she was able to attain a trusted status before betraying the organization.