Sophie is one of the main key characters in The Walten Files, possibly the protagonist. She is confirmed to be alive, at least by 1982. After her siblings deaths and her parents’ disappearances, she started taking a prescribed medication for her trauma and possible anxiety.
Sophie and her girlfriend, Jenny Letterson, are heard discussing the arcade game BunnyFarm during their playthrough. Throughout the video, Sophie is shown the events and info on many of the Bon's Burgers victims in varying degrees of clarity, including Susan's death, part of Felix Kranken's backstory, the death of the man haunting Boozoo (who is possibly named Charles), and her mother, Rosemary's, death. By the end of the video, Showbear appears to her from a well and tells her the story of her sibling's deaths during a car crash caused by Felix, who was driving the children home drunk. Sophie is heard a few times during this segment and seems to be crying, horrified at the events she is witnessing. She does not speak at all towards the end and it is unknown if she left the room or is silent due to shock.
Afterwards, likely the next day, she told Jenny what happened, and, likely as shown in the trailer, told her about the pills.
She appears in the cartoon holding a lighter and wearing a Bunny Smiles Inc. caretaker uniform while Bon looms over her. It is speculated that Sophie will eventually start working for Bunny Smiles Inc. to find more information on her father's disappearance.
A pill bottle with Sophie's name and the repeating mantra of "Safety in pills, Sophie", suggests that she uses medication to repress her childhood memories.
In a TWF anniversary image, a poster of Sophie wearing a collared shirt can be seen. She has her mouth wide open, and under her are the words "Sophie Walten - 07.30.1974" since Sophie is alive up until at least 1982, this poster could possibly be depicting a teenage Sophie somewhere in the 70's, likely after her family's deaths.
Not much is really known about Sophie’s personality, as the pills that she takes most likely sedate her from all of the trauma that she has experienced. However, she is curious, as even after seeing the events of Billy’s mini game, she wants to know more about what she can find, as she begins to piece together the events as to why she’s being shown these images.
In all her appearances up to now, Sophie has had tanned skin, dark curly brown hair cut to her shoulders, dark brown eyes and a long sloped nose similar to her father's. In some of her other depictions, she appears to have a mole under her left eye.
In the trailer and Bunnyfarm, Sophie is seen wearing a letterman’s jacket bearing the insignia “Brighton 82,” and in the Company introductory tape, she is wearing the classic purple BSI caretaker uniform.
- It has been confirmed by the creator, Martin Walls, that Sophie is indeed dating Jenny Letterson.
- Sophie's sexuality has been confirmed as lesbian by her voice actor.
- Martin has confirmed that Sophie’s favorite show is The Muppets, but keeps it a secret.
- Martin has said Sophie has mainly inherited traits from her mother, however she has inherited some of her father's facial features and his smile.