Wataru Takagi (高木 渉)
Background
Takagi's full name and kanji comes directly from his voice actor Wataru Takagi. Created for the anime (but later appearing in the manga), the character was originally an unnamed police detective, but during one recording session Chafurin (Inspector Megure) read the line "You, what's your name?" to the character, and Takagi adlibbed the response "It's Takagi, sir!", and he has been referred to as such ever since.