No direct information is available regarding Detective Wataru Takagi's specific role, actions, or characterization within the film Detective Conan: Quarter of Silence. The search results provide extensive background on the character from the general Detective Conan series but do not detail his portrayal in this particular movie. His involvement in the film is confirmed only in the most general sense, such as his presence among the police officers providing security at a public event, but no further specifics about his function or development in this story could be found. Consequently, a comprehensive character description focused exclusively on this movie cannot be provided.