Real Name: Kagayaki Juichi Male Silver-gray hair 10 years old Step-great-grandson of Silver Heart Father: Phantom Thief Joker Mother: Diamond Queen Likes curry, cats, comic books, and games. Dislikes dogs and carrots. Terrified of dogs. When he was a baby, he tried to doodle on the faces of Hosshi and other dogs for fun, but they chased him while barking, and he nearly died. Personality: Mischievous prankster. Tools: Image Book, Road J (Car). Signature Phrase: "Another surprising page tonight!" When teased: "Just you wait! One day, I'll definitely surpass the Miracle Maker!" Uses polite speech (honorifics) with Hachi, Joker, Queen, Spade, Rose, Shadow Joker, and Silver Heart.

Real Name: Jack Jones Silver-gray hair Male Parents are deceased. Wife: Diamond Queen Son: J Likes curry, comic books, and games. Dislikes cats. Personality: Mischievous. Currently traveling through space with Diamond Queen; left J in Hachi's care. Hachi's master. Silver Heart's disciple. Friends: Spade, Rose, Shadow Joker. Tools: Image Gum, Balloon Gum, Road Joker (Car), Sky Joker (Airship), Wristwatch. Past: His parents died in a plane crash, after which he met Silver Heart and became a phantom thief. He is a genius.

Real Name: Queen Emerald Yellow pigtails Female Step-grandfather: Silver Heart Parents are deceased. Husband: Phantom Thief Joker Son: J Likes strawberries. Personality: Cheerful and energetic. Dislikes the dentist. Friends: Spade, Rose, Shadow Joker. Currently traveling through space with Joker. Tool: Diamond Sword. Past: Her parents were the King and Queen of the Emerald Kingdom, but they died when the castle caught fire. Silver Heart named her Diamond Queen when she was still a baby and raised her.

Real Name: King Male Parents are deceased. Likes French cuisine. Mature personality. Silver Heart's disciple. Long blue hair. Friends: Joker, Shadow Joker, Rose, Diamond Queen. Vice Chairman of the Phantom Thief Federation. Wears glasses and ties his hair in the middle. Tool: Ice Gun. Past: His parents died in a ship accident. He later met Joker and Queen and became a phantom thief.

Real Name: Fuma Hachi Male Ninja. Currently raising J. Black hair. Ancestor: Ichimaru (Deceased). Parents and siblings (10 siblings in total; Hachi is the eighth). Excellent at cooking. Joker's disciple. J's mentor. Kind and warm-hearted. Uses casual speech with J.

Long white hair tied back. Male Blind in the left eye. Parents died shortly after he was born. Step-granddaughter: Diamond Queen. Step-great-grandson: J. Likes cream stew. Often strains his lower back. Master to Joker and Spade. Junior to Phantom Thief 20 Faces. Principal of the Phantom Thief Academy.

Pink hair. Twin brother: Shadow Joker. Female Likes pandas and apple pie. Kind and friendly. Friends: Joker, Queen, Spade. A teacher at the Phantom Thief Academy; wears glasses. Uses psychokinesis.

Male Dark blue hair. Real Name: Cyan. Twin sister: Rose. Personality: Has a bit of an 'eighth-grader syndrome' (chuunibyou) but is tender toward Rose. Likes coffee, pandas, and apple pie. Friends: Joker, Queen, Spade. Tool: Umbrella.

Male Silver Heart's senior. Guest's great-grandfather. Deceased. Tool: Mystery Hand. Currently exists as a spirit at his own grave.

Real Name: Kuroba Batsu Male 10 years old. Waiting for the day to take revenge on J at the Phantom Thief Academy. Malicious personality.