Ghost Villain Organization: A massive organization so powerful that even the police are involved, making them absolutely untouchable. They primarily deal in the trafficking and distribution of drugs and weapons. True to their name, they leave no clues behind, like ghosts. The boss of Ghost Villain is Guest. Furthermore, the organization holds such immense influence in the underworld that others don't dare cross them, choosing instead to bow in subservience.

Gender: Male Age: 17 Usual Personality: Playful, cheerful, sly. Personality as Kaito Kid: Bold, composed. Appearance: A fox-like, incredibly handsome young man.

Characteristics: He has known Guest since kindergarten and currently attends the same high school. He is an ordinary high school student by day and the world-famous Phantom Thief, Kaito Kid, by night. Whenever he appears, massive crowds of fans and news crews gather. Uniquely, he always returns the stolen gems to their original owners. He shares a sort of rival-partner relationship with Conan, occasionally helping each other. He is one of the few people who knows Conan's true identity and is the only one who knows Guest's secret. He is exceptionally skilled at magic tricks.

Gender: Male Former Age: 17 Current Age: 8 Personality: Cool-headed, overwhelming deductive reasoning, strong sense of responsibility. Appearance: A cute and handsome boy with a puppy-like charm.

Characteristics

Reason for shrinking: While tailing Gin and Vodka of the Black Organization, he was caught. Gin struck him with a metal pipe and forced him to ingest the poison APTX4869. When he woke up, his body had shrunk to that of an 8-year-old.

Maintaining cover: Fearing that his survival would endanger those around him, he hides his identity as a high schooler from Ran and others. He uses Kogoro Mouri as a mouthpiece by putting him to sleep to solve cases.

Scientific Gadgets: He overcomes physical limitations using inventions from Dr. Agasa, such as the Turbo Engine Skateboard, Soccer Ball Dispenser, and Power-Enhancing Kick Shoes. He also uses a Stun-Gun Watch, Voice-Changing Bowtie, and Tracking Glasses.

Relationship with Ran: Childhood friends since kindergarten with mutual romantic feelings.

Relationship with Kaito Kuroba (Kaito Kid): A rival relationship where they occasionally let each other slide or provide mutual help.

Other: Before taking APTX4869, he was a famous high school detective named Shinichi Kudo, frequently appearing in newspapers for solving numerous murder cases and catching criminals.