Click here to read the translation of the first few pages by Fujiwara from DCTP I'm glad we are dealing with someone different looking. An identical twin or someone similar would have been a pain in the ass to deal with theory wise. We know the brother is probably not Amuro because Sera presumably called her middle brother in chapter 800 at the same time Amuro was chatting with Vermouth. Since Sera doesn't know where her brother is, I guess we can rule out a not-Akai-in-disguise Okiya being the middle brother, because she met him at Shinichi's place (although her reaction to Okiya was notable). "Sera: During the case the other day he also told me that my deduction was unreliable, … but since you were there to come to the rescue if I was wrong …" It seems we are looking for someone familiar with Conan. All the new semi-relevant male characters introduced in the Bourbon arc that are between 16 and 35 are: (35 chosen because we don't know Akai's age and 35 is probably a good guess for the upper limit) Yamato Kansuke - Nagano officer (35) Enomoto Sugihito - Poirot waitress Azuha's brother (28) Morofushi Taka'aki (Koumei) - Nagano officer (35) Ares Ashley - Minerva's tennis coach (30) Amuro Tohru - Bourbon (29) Onda Ryouhei - Kogoro imposter (21) Haneda Shuukichi - Yumi's semi-ex-boyfriend (28) I would axe Enomoto, Ares, and Onda for not being smart enough to give case advice. Amuro is out for phone call reasons. That leaves the two Nagano officers and Shuukichi. All three know Conan well enough and are smart enough to advise on cases. The two Nagano officers have had their pasts decently expounded upon, but I suppose that does not rule them out. If we have to choose a known character, Shuukichi seems the most likely. He's identifies Conan's intelligence immediately. He is also busy collecting titles to the point where he secluded himself from Yumi, so he may not have told Sera what he has been up to as well. Akai could easily be lying about his age (27) as Okiya, but Shuukichi's 28 is something to think about. Edit: reread Shuukichi's chapter: • Shuukichi was noted by Yumi to be pale white, which Akai is. Double edit: There is a plausible way for the second brother to be a new character. During the yet-to-be seen episode where Shinichi and Sera met somewhere with waves, Shinichi might have met the middle brother as well. If there was a case (likely because DC) and Shinichi did a good job as a kid, then the brother might have remembered Shinichi or kept up with his detective progress. If, when Sera calls the brother, she talks about Shinichi instead of Conan because she knows Conan's true identity, then the brother could say leave it up to Shinichi. It's not a great idea, but it's workable.