Akai family's middle brother

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Masumi Sera reveals that she has a second brother whom she has been calling regarding case solutions.

Description and known facts

The middle brother's hand and cellphone

• He does not look like Shuichi Akai or Masumi Sera. Those two take their looks from their mother, while the middle brother looks more like their father.
• The middle brother is older than Masumi, but younger than Shuichi. Neither of their ages have been revealed, but Masumi attends class with Ran and Shinichi who are 16-17, and Subaru Okiya claims to be 27.
• He is apparently in the middle of an important job and won't tell Masumi where he is.
• He is very intelligent; note that Sera characterizes the already intelligent Akai as "strong" in contrast to the middle brother. He advises Masumi on cases via cellphone. He was able to correctly deduce over the phone that masumi's deduction was unreliable in a bathroom murder case.
• In one panel, we see the middle brother responding to Masumi's message using his right hand and a black cellphone. Unless the brother is disguised, this would imply he has light skin. The use of the phone with the right hand is not an absolute indicator of handedness because sometimes characters with known handedness will use phones with their off hands.
• The middle brother recognizes Conan and knows he is a good detective. After an exchange of information regarding deductions, the brother asked Masumi who she was referring to. Masumi shows the brother Conan's picture thinking he will be surprised. The brother replies back that "if it's him, then there's no problem". Masumi is very surprised and wonders how her brother knows Conan. Her suspicion makes sense because Conan didn't exist prior to Shinichi shrinking. The brother later sends another text to Masumi, which makes Masumi react "Ah, I see. So that's how it is."

Possible Suspects

Assuming the middle brother is between 16 (assumed lower range for Masumi's real age) and 35 (assumed upper range for Akai's age based on his appearance and reasonable full-blooding sibling age separation) the following characters could qualify as suspects in reverse order of their introduction date.

Minor or New Character

It's possible the middle brother is a minor character who was a suspect or witness in a case, but did not distinguish himself or demonstrate his intelligence. It's also possible for the middle brother to be a character who has not been introduced yet, but will be later in a flashback.

Characters introduced in the Bourbon Arc

• Shuukichi Haneda: Yumi's semi-ex-boyfriend (28)
• Ryouhei Onda: Kogoro imposter (21)
• Tooru Amuro: Bourbon (29)
• Ashley Ares: Minerva's tennis coach (30)
• Taka'aki Morofushi (Koumei): Nagano officer (35)
• Sugihito Enomoto: Poirot waitress Azusa Enomoto's brother (28)
• Subaru Okiya: Engineering student (27)
• Kansuke Yamato: Nagano officer (35)

Shuukichi Haneda

Shuukichi is very intelligent and noticed Conan was an excellent detective on their first meeting. However, Shuukichi is famous and recognizable which contradicts Sera not knowing where he is or what he is up to.

Taka'aki Morofushi

Taka'aki Morofushi is intelligent and has light skin. He was still working in Nagao as a police officer though, so Sera should be able to find out where he and what he was doing. Sera also lacks a Nagano accent, something that might be expected learning Japanese with a family who lived in Nagano for a period of time. (Koumei's lived in Nagano as a child.)

Subaru Okiya

Although Subaru Okiya was revealed to be Shuichi Akai, it is possible Akai disguised as his middle brother for some reason. However, Sera would not have wondered how he knew Conan because she was with Subaru and Conan earlier during a case.

Tooru Amuro

Amuro's intelligence matches the middle brother's expected level; however, Amuro's dark skin contradicts the light-colored hand holding the phone when texting Masumi.