In "Detective Conan", Officer Takagi is definitely his loyal "internal response" in the Metropolitan Police Department, and he has questions and answers to Conan, and every time Conan has something to do in the process of handling the case, he thinks of Officer Takagi for the first time. And Takagi is also very powerful, although it seems to be dumb, but the hard setting and efficient evidence collection are the most trusted "subordinates" of Conan.
So someone will ask? Why Takagi listened to Conan so much, was it because he already knew Conan's identity. Some people also pointed out that Takagi had already checked Conan's fingerprints, because fingerprints are unique, even if the body becomes smaller, fingerprints will not change, so knowing Conan's true identity is Kudo Shinichi. On this point, in fact, the plot is not directly described, but with a dispensable foreshadowing dialogue to hang everyone's appetite. So what is the relationship between Takagi and Conan, I will briefly analyze it.
The story of Takagi checking Conan's fingerprints appears in episode 551 of the overseas split version, "Red and Black Showdown".
At that time, in order to confirm that the body on the charred car was not Shuichi Akai, James explained that he would use a method that would not be detected by the Japanese police, and then deliberately said that he would use fingerprint comparison. And Judy's teacher really put on the set, thinking that Akai Shuichi had touched Conan's mobile phone before, so he could borrow Conan's mobile phone to go to the police for fingerprint comparison.
So Judy got Conan's mobile phone and casually found a reason to give Takagi to investigate the fingerprints, and stressed that this mobile phone has Conan and his own mobile phone, which needs to be checked out and looking for the fingerprints of the third person to compare.
It is obvious here that Officer Takagi must have Conan's fingerprint data and also entered it into the system for troubleshooting.
Some people here will say that as long as Conan's fingerprint is entered into the system, the result is Matched by Kudo Shinichi, don't you know Conan's true identity?
That being said, there are some problems here as well.
First: Japan does not have the fingerprint data of the whole people, generally speaking, there are only entry and exit personnel, criminals, and some case-handling personnel in the system. There are many different famous cases in Japan, where criminal suspects leave a lot of evidence such as fingerprints and DNA at the scene, but there is no data as a match. Some police have gone through decades of investigation and collected fingerprint data from hundreds of thousands of people to find it, and some are still unsolved.
Second: Kudo Shinichi's fingerprints are extremely likely, after all, from childhood to adulthood, they need to enter and exit frequently, and they have also assisted the police in handling cases as Kudo Shinichi. As Conan's identity, because of the need to handle the case, Conan's fingerprint data was entered, so it is very likely that the fingerprint data of Conan and Kudo Shinichi were present in the fingerprint database of the Metropolitan Police Department, and the fact that the two data matched may really only be known to Takagi, who compared the fingerprint data.
Therefore, both sides can explain clearly, and this foreshadowing can be used when the subsequent plot needs it, and it can also be justified if it is not needed.
Of course, there is still a detail left here, that is, Conan's mobile phone was detained by the Metropolitan Police Department as evidence, and a mobile phone of the same model was changed to Conan to use. After Conan got the returned mobile phone, he immediately investigated the serial number of the mobile phone and found that it was not the mobile phone he used before.
In the earlier episode of "12 Million Hostages", Takagi doubted Conan's identity, and Conan's answer was "I'll tell you someday", explaining that he had another identity that was inconvenient to reveal.
Many people judge by this that Takagi will secretly investigate Conan. But I still think takagi still doesn't know at this stage, he has always just thought that Conan is not simple, and he did not think so much. If the later plot is to pull Takagi into the main plot, perhaps this foreshadowing will unfold.
In fact, in the Metropolitan Police Department, the person who is more interested in Conan is actually Kuroda Management Officer, who directly called Conan "Maori Kogoro's think tank" when he appeared in the sequel to the 870th episode of the overseas split version of "The Secret Room Incident of the Blog Actress", and specifically named Conan Edogawa to take more care of him. Therefore, I think that compared to Takagi, Kuroda Management Officer and Amuro Toru, two characters who are already in the main line, are more worthy of plot development.