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Little Thief is a simulation device owned by Kay Faraday that allows her to re-create and investigate a crime scene, even when she doesn't have access to the real thing, by entering data such as blueprints, police reports, testimonies, people, weapons, and other conditions related to the crime in question. The projections produced have a green tint to them. Kay Faraday's father, Byrne Faraday, was the original owner of Little Thief. He used it during his time as a part of the Yatagarasu to plan his thefts by working out where a target's security systems were in order to evade or deactivate them. The device is introduced along with Kay in The Kidnapped Turnabout, where it is used to investigate the stadium and the haunted house in Gatewater Land. In Turnabout Ablaze, the device is used to recreate the Babahlese Embassy's secretariat's office, which had burned down.
In Gyakuten Kenji 2, Little Thief can recreate the crime scene at multiple moments in time. Switching between times is done by talking to Kay during the investigation.There are two full investigations using this feature in the game: in the prison courtyard in The Imprisoned Turnabout, and outside the Big Tower The Grand Turnabout to recreate the scene of the SS-5 Incident. Little Thief is also used briefly to recreate the Autumn Palace before Yutaka Kazami was poisoned in The Inherited Turnabout. Graphical changes are present as well. The Re-Creation has horizontal lines of a darker color, as well as small static in some places. Also, when making or changing recreations, Little Thief emits hologram displays, and when setting full size, shows a ring of displays (As opposed to an inverted pyramid).
In the Japanese version it is called "Nusumi-chan". "Nusumi" translates as "thief", while "-chan" is a diminutive suffix, used as a Japanese honorific, that expresses that the speaker finds a person endearing. Thus the name has a roughly similar meaning to the English version.