Standing barely two feet tall, the Doll Detective possesses supernatural mobility that allows it to traverse ventilation shafts, crawl spaces, and areas too dangerous for human survivors. Its plastic composition makes it immune to infection, while its button eyes can record and replay witnessed events like organic security cameras. The doll carries a tiny magnifying glass and notepad, both somehow functional despite their miniature scale, and leaves behind small chalk outlines around areas of interest.

It investigates crime scenes throughout the mall, uncovering evidence of pre-outbreak conspiracies, tracking infection patterns, and documenting survivor behavior. The Doll Detective serves as both an information source and potential threat, as it shows no loyalty to any faction and will expose anyone's secrets if they advance its investigation.