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He does not look like Shuichi Akai or Masumi Sera, who presumably resemble their mother. The middle brother looks more like their father.[1]
- The middle brother is older than Masumi, but younger than Shuichi.[1] 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. The brother's former high school classmates are currently 28 and 29 years old, suggesting that the brother is probably similarly aged. Altough if that were the case, then Akai would be older than 27.
- He is apparently in the middle of an important job and won't tell Masumi where he is.[1]
- 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.[1] He was able to correctly deduce over the phone that Masumi's deduction was unreliable in a bathroom murder case. Masumi says that his high school friends report that he solved puzzles and mysteries very easily.[2]
- 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.[3]
- The middle brother recognizes Conan and knows he is a good detective.[3] 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.[4] The brother later sends another text to Masumi, which makes Masumi react "Ah, I see. So that'show it is."[5]
- While the middle brother is not a detective himself, his intelligence seems to be well-known among the students from his high school, as he apparently has solved some mysteries in his class during his time studying there.[2]
- According to Masumi, the middle brother's surname had been "Sera", which he got from his mother's side, until he graduated from high school. His current surname in the present timeline is presumably something else.[2
