Takagi knows Conan's identity (Theory)

[Eri-chan]

Interesting. Takagi wasn't a big player until later, and he's undergone so many character design changes, so...hm...

[Stopwatch]

Y'know, considering all the Metropolitan Police Love Stories and the Matsuda case I think it's possible Aoyama originally intended to have a police character like Takagi. He just decided it'd be better to hijack an existing anime character because it was easier and we'd already been introduced to him. If that is true then it's likely that it was planned from the beginning to have a police officer find it out.  :D
...at least that's what I'm hoping for  ;)  

[DaisukeKazamatsuri]

Y'know, considering all the Metroplitan Police Love Stories and the Matsuda case I think it's possible Aoyama originally intended to have a police character like Takagi. He just decided it'd be easier to hijack an existing anime character because it was easier and we'd already been introduced to him. If that is true then it's likely that it was planned from the beginning to have a police officer find it out. 
...at least that's what I'm hoping for   

That would be so awesome!  I really hope that's the case, it would mean that it was inevitable.  It's kind of an interesting idea for his role to be predetermined, after all, Gosho did say that he didn't expect the series to last this long.

[Jessicaz140]

Mmmm... I always thought that Takagi acted strange around Conan too. So I quite agree but can't be certain...

[Stopwatch]

Just noticed this while rewatching anime eps and around 200 to 400 Takagi is actually shown questioning Conan plenty of times. The fact that this suspicion seemingly vanishes or is kept to himself more in later episodes/files points towards Takagi potentially realising that Conan isn't who he says he is (Anime ep 304/Volume 36 and 37 Conan practically confirms this) and that unless he's cautious he'll either have Conan going all Scary-Shiny-Glasses at him or people willl think him crazy. The second one is probably what would bother him more considering Takagi doesn't have much self confidence as well as the fingerprint evidence proving Conan=Shinichi, something which would worry him about whether he's right what with how far fetched it seems. Also, James Black kidnapping case Takagi, after Conan goes into deduction mode, thinks, "What generation are you from?". This is used as comedy at the time (and it works  ;)) but if Takagi was thinking that even jokingly then he knows something is  very, very weird with Conan.  
Seriously though, watch any non-AO episode between 200 to 400 and you'll have a hard time believing that Takagi never suspected Conan wasn't what he said he was.

Spoiler:

...implications much?  ;)

[miakakiri]

Stopwatch-san: You also have to remember that shortly after this part in the manga Vermouth is shown leaving. There has been some speculation (not saying I believe it) that she was disguised as Takagi and took the phone. Admittedly this is usually put forth by people arguing that Akai isn't dead.

[Stopwatch]

Eh? Really? Do you have any links to this theory 'cause I haven't heard of it before (and it seems interesting  )

[Read and Gold Phoenix]

Y'know, considering all the Metropolitan Police Love Stories and the Matsuda case I think it's possible Aoyama originally intended to have a police character like Takagi. He just decided it'd be better to hijack an existing anime character because it was easier and we'd already been introduced to him. If that is true then it's likely that it was planned from the beginning to have a police officer find it out. 
...at least that's what I'm hoping for   

I AM SO DOWN with you for that! <3

[Tori AL]

Y'know, considering all the Metropolitan Police Love Stories and the Matsuda case I think it's possible Aoyama originally intended to have a police character like Takagi. He just decided it'd be better to hijack an existing anime character because it was easier and we'd already been introduced to him. If that is true then it's likely that it was planned from the beginning to have a police officer find it out.  :D
...at least that's what I'm hoping for  ;)  

shouldn't we make sure by checking out dates and such? When did Takagi first appear and was this before or after the first anime episode aired? (well, I guess it's possible Gosho already knew who (voice actor)  was doing what (character) since he created the series, but I'd like to know. Of course, I'd do it myself, but I'm too lazy )

[miakakiri]

Y'know, considering all the Metropolitan Police Love Stories and the Matsuda case I think it's possible Aoyama originally intended to have a police character like Takagi. He just decided it'd be better to hijack an existing anime character because it was easier and we'd already been introduced to him. If that is true then it's likely that it was planned from the beginning to have a police officer find it out. 
...at least that's what I'm hoping for   

shouldn't we make sure by checking out dates and such? When did Takagi first appear and was this before or after the first anime episode aired? (well, I guess it's possible Gosho already knew who (voice actor)  was doing what (character) since he created the series, but I'd like to know. Of course, I'd do it myself, but I'm too lazy )

Considering Takagi-keiji gets his name from his seiyuu.... (voice actor, for anyone not familiar with the Japanese term)
I do see what is meant about hearing Takagi-keiji in episode 1, but all we see are uniformed officers. (He's the one who shouts to call for an ambulance.) I doubt that's actually the Takagi-keiji character we know. Considering his seiyuu also does Genta-kun, and considering just how MANY extras there are, of course we're going to get a bit of a voice overlap here and there between important and unimportant characters. There's not enough evidence to really suggest Takagi was there that first night. If he's been with Division 1 for a year, why would he be sent back out to patrol?
In episode 31(manga files 102-104) there is an officer with the right voice and approximately the right appearance, though he's never called by name (the same voice is used for the person Conan borrows the paint gun from, though... :p).
We see this officer (or a very similar one) again in episode 32 (manga files 105-17), only this time he's in uniform (he's the one Eri sends to try climbing over the top of the stalls). There also appears to be another officer borrowing Takagi Wataru's voice (though it's not quite Takagi-keiji's voice). This makes things slightly more complicated to figure out. Once again, the officer who resembles and sounds like Takagi-keiji is not addressed by name.
Takagi's first appearance in the manga with the familiar name and face occurs in file 171, the middle of the case with the historical actor. (This case became episodes 102-103 of the anime.)
In the (admittedly messed-up) chronology of the series, though, he first meets Ran and Shinichi on the airplane to LA a year before the start of the series, in Shinichi's First Case. (Episode 163, I believe. Manga files 204-207.)

Satou-keiji's first appearance, by the way (with familiar name and face) is in manga file 190, during the Emperor's Cup case (the shooter at the big soccer game). She's one of those guarding the bag.


And I totally lost track of what I was really trying to say. ~_~*

[Shuusgirl]

Even though I hope Akai's still alive, I really hope Takagi was...Takagi in that scene.  'Cause that means that he has Conan's fingerprints and so if Shinichi's are on file then maybe...

[Feb914]

In case anyone is interested I have found some other instances that show that Eisuke knew who Conan was or was at least suspicious. If you're not interested just skip this post . Sorry if the links don't work.

This page at the bottom and the beginning of the next page (You have to actually read what he says): http://www.mangarush.com/manga/detective-conan/510/p-5

This page also sort of shows he's suspicious, mostly from what Conan says about it: http://www.mangarush.com/manga/detective-conan/510/p-17

This one might also prove he was trying to prove his suspicions, or it could just be random glaring : http://www.mangarush.com/manga/detective-conan/531/p-16

Again this is because of what Conan says at the bottom: http://www.mangarush.com/manga/detective-conan/532/p-18

I'm too lazy to go find more. This just shows that there are lots of subtle hints, sort of like the ones people already mentioned for Takagi. Hope this helps anyone who was interested.

Isn't it already seen when Eisuke said goodbye to Conan before leaving for US, Conan revealed himself as Shinichi to prevent Eisuke confess to Ran?

[Stopwatch]

I don't get what you're saying Feb914, can you explain it a bit further or something? 

[Sato]

yep, Jodie ask Takagi one night when Eisuke and Conan are together. That scene open a new hidden story which will be reveal in an important arc soon. From there onwards, Takagi allow Conan on case with him and address Shinichi as Shinichi-kun on special occasion when Conan talk with alias of Shinichi. It become personal; if Takagi has Shinichi's number from police's file and call, that moment he know Conan is Shinichi.

[Bubbles]

I think Takagi might've thought of it... but it probly hasn't occured to him that CONAN is SHINICHI...
I don't know...