Canon
Canon refers to information that is considered "official" by a fictional universe's fan-base. In this case the word canon refers to information that is considered official for Detective Conan.
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Canon
In Detective Conan only information given by Gosho Aoyama from interviews and the manga-based storylines, characters, and places are considered to be canon.
Non-canon
The following sources of information are considered to be non-canon and are deemed unofficial:
Non-canon information that has become canon
Certain elements from non-canon sources have been turned into canon via Gosho Aoyama and the manga series. Here are a few examples:
Wataru Takagi
Takagi was first introduced in On Location, TV Drama Murder Case as an unnamed police detective that had accompanied Inspector Megure on the scene. For some time, this character only appeared in the TV original episodes directed by Haruo Ogawara. The character's name is first given as "Detective Takagi" in the credits for the Karaoke Box Murder Case despite his face not actually appearing on-screen. Although the Karaoke Box Murder Case was based on a manga story Takagi does not appear in the original. Takagi receives his first manga canon appearance in the Historical Actor Murder Case.
Ninzaburo Shiratori
Shiratori was first introduced in The Time-Bombed Skyscraper and received his first canon manga appearance in the first Metropolitan Police Detective Love Story as Takagi's rival for Miwako Sato's affections.
