A sub-heroine who has a one-sided crush on Heiji Hattori. As much as she ardently loves Heiji, she displays a strong sense of rivalry toward her love rival, Kazuha Toyama. She happens to bump into Heiji in the hallway of the Nichiuri TV building, where she suddenly sheds tears and says, "It's destiny!" greatly flustering both Heiji and Kazuha. She begins to make very aggressive advances toward Heiji, and the scenes where she teases Kazuha in the process are the highlights. While looking at an article about Heiji, she calls him her future husband. Although the marriage promise she made with Heiji as a child turned out to be a misunderstanding, she shows no sign of giving up on him under the support of Iori, who serves the Ooka family. She is 17 years old and a second-year student at Senshin High School. (Honestly, even Heiji thinks she's pretty, so his heart wavers slightly.)

Age: 18. Gender: Male. Birthday: January 17th. Likes: Kazuha Toyama, Momiji Ooka (but likes Kazuha more). Skills: Kendo, deduction, motorcycling. Dislikes: Losing to Shinichi in deduction. Appearance: Tanned skin with a spiky tuft of hair on one side. His eyes are blue-green. Personality: Brave and passionate. He has a mischievous side at times.

Age: 18. Gender: Female. Birthday: March 12th. Person she likes: Heiji Hattori. Skill: Aikido. Dislikes: Other women appearing around Heiji (hates it immensely). Appearance: Wears her hair in a ponytail with a ribbon. Her features are closer to a cat-like face than a dog-like one. Personality: She gets very shy in front of the person she likes (e.g., Heiji). She always smiles brightly and is accepting toward her friends. (She is Heiji's childhood friend.)

A great detective with an IQ of 400. (Loves soccer. Has almost no weaknesses, except for being tone-deaf.) Ran Mouri's boyfriend. (Handsome.) (He likes Ran Mouri very much.) (Admires Sherlock Holmes. He's a mystery geek.) (Heiji's friend and rival.) He is a cousin of Kaito Kid (Kaito Kuroba). (Ran Mouri's childhood friend.)

Age: 18. Gender: Female. Childhood friend of Shinichi Kudo. (Extremely pretty.) (Shinichi Kudo's girlfriend.) Kind-hearted. Likes: Shinichi Kudo. Dislikes: Shinichi's mystery geek behavior.

Friend of Ran Mouri and Kazuha Toyama. A daughter of the wealthy Suzuki Group. Makoto Kyogoku's girlfriend. (A fan of Kaito Kid.)

The world karate champion. Sonoko Suzuki's boyfriend, he strongly dislikes Kaito Kid (because Sonoko is so interested in Kid). He is a karate champion who could be considered a human weapon.

A world-renowned phantom thief. Shinichi Kudo's cousin, his real name is Kaito Kuroba.

The culprit who murdered Toshiya Yajima and Togo Kaieda, and an accomplice in the Shikao Nagoro murder case. Five years ago, Shikao Nagoro, the chairman of the Nagoro-kai, challenged Satsuki Achiwa, who was the chairman of the Satsuki-kai at the time. He leaked information to the media that 'Satsuki-kai is avoiding the match because they fear Nagoro-kai,' creating a situation where she had no choice but to accept the match. Having set up a match where the survival of their respective groups was at stake, Shikao Nagoro suddenly came to the mansion the day before the match and played a Karuta match against Satsuki Achiwa.

Momiji's mentor, he was supposed to compete against Satsuki Achiwa five years ago but suddenly vanished.