Subaru is one of the few characters who knows Conan is Shinichi after confirming his earlier suspicions by listening to Conan make a phone call as Shinichi.
Does Akai Shuichi know Conan is Shinichi?
Subaru Okiya (officially revealed to be Shuichi Akai in File 898) obtained proof of Conans identity when he caught Conan pretending to be Shinichi over the phone. However, while Conan still refuses to speak of his identity, its revealed he has already realized that Shuichi Akai knows he is Shinichi Kudo.
Does kogoro know Conan is Shinichi?
However when he began further investigating Kogoro, it lead to him discovering Conan Edogawa is really Shinichi Kudo. Due to this, Conan reveals himself as Shinichi Kudo, refusing Eisukes request and Eisuke then revealed this truly confirms his suspicions and confesses to knowing Conans true identity all along.
Why does Rei Furuya hate Akai?
Rei additionally suspected that Shuichi was a spy for the FBI, which turned out to be the case. Reis animosity towards Akai Shuichi appears to stem from the death of Hiromitsu, a fellow spy from the PSB and his childhood friend. Thus, he still blames Shuichi for Hiromitsus death.
Does Conan know Bourbon identity?
Conan only knows that Amuro is Bourbon, because Amuro told Sherry (actually Kaitō Kid, but he doesnt know that), who as far as Amuro knows, died afterwards. If Amuro finds out Conan knows his identity, then hell try to find out how he knew, which could lead him to Haibara.