Sera Masumi identity, motive, whatever speculation topic

[Chekhov MacGuffin]

Isn't thinking about how there could be no way he is who she thinks he was, being suspicious of who she saw?

...

Seeing someone who looked like Akai, she ran off to investigate.  If Akai had dropped his disguise, something must have happened.  Not finding him, she's now suspicious that someone is masquerading as him, which he wouldn't necessarily have told her.

No it doesn't make sense. Her reaction is one of disbelief that the guy could be Akai, but at the same time she does not seem suspicious of him. Her expression doesn't have the crosshatching over the nose that normally marks someone feeling suspicion.
If she knew Akai was alive because he gave her orders, she would react in surprise or suspicion because he has a giant burn, or wonder what he was doing there, or be happy to have seen him, or something like that. The problem is that she doesn't look suspicious or happy when she decided that he couldn't be who she is thinking of. It fits the situation perfectly if she thinks Akai is probably dead because, say, that is what the FBI told her family.

[Partsu]

okay what about this:
Akai gave her that mission BEFORE his "death"?

[julytms]

For some reason i feel like Sera is Hondo Eisuke in disguise. I know Sera is a woman but it's not unusual for a man to dress up as woman just like Kaitou Kid. And the reason why he is not clumsy anymore might be because of some kind of training. I don't think she is Bourbon because Conan did not seem threaten by her.

[Silver1412]

First option. Those eyes are way too similiar to be a coincidence ~nya. (Then again Gosho may have done that on purpose to stop our suspicions of her being Bourbon ~nya!)

[Chekhov MacGuffin]

okay what about this:
Akai gave her that mission BEFORE his "death"?

The timing would be tight, because it would have to happen after he makes sure Kir is a CIA agent and agrees to the fake death plan, but before the actual plan. It also means Scar Akai can't be part of the reason she was called over because he hadn't appeared yet. Other than that, this could work, assuming Akai did not tell Sera anything about why she would be protecting Conan or Haibara or their identities. ("Hi sis, I'm in Japan and in a bit of trouble. I need you to come here and keep and eye on these kids. Bye.") The delay before Sera got to Japan is a bit strange, but doesn't invalidate it. Personally I don't think Akai would have called his sister over because of the type of guy he is and she would be somewhat redundant if he was Okiya.

[caniran]

My 2 cents would be
- She is Undercover (would explain the phone call from Chapter 800)
- James knows that she is Akai`s sister and is maybe involved in the undercover part.
- She knows Shinichi from childhood.
The part where im a little uncertain is the Parents part.She describes them perfectly as they would be
Shinichi´s Parents. The part where the Puzzle will not fit in is where says a few times that her breasts would develop because
of her mother (maybe Yukiko).The part where she Sera said: "Anyway my Mom`s skinny too, but her breasts are pretty big so im not worried! Right, Ran-Chan! and Ran said: "Y-Yeah..." and thinks I´ve never met her though.As Sera knows that Ran lnows her Mother.

[Citan]

I highly doubt Shinichi's parents would hide the fact he has a sister from him. Sera looks to be about Shinichi's age, so unless they immediately gave her up for adoption he'd have to know about her, and I doubt Shinichi would simply "forget" he had a sister, or that Ran would have forgotten for that matter. They grew up together and know everything about each-other. Ran would know if Shinichi had a sister.

So unless we're about to find out that Yukiko was/is living some secret second life I'm going to say your theory is quite unlikely. If Sera is someone's sister then it's someone whose family we don't already know much about. Like Akai for example, which is the current accepted answer. However we don't know that for sure, and won't until Gosho outright tells us, and we all know how he likes to throw curveballs. She could be Takagi's sister for all we know.

[Partsu]

if Vermouth were to be her mother it would explain few things...but not her Akai-like eyes...or some other things...but aaanyway....maybe Ran & Shinichi knew Sera's before their departure to U.S? but surely they wouldn't forget something like that...


naaah it's just Masumi's way of fooling around...

[caniran]

I highly doubt Shinichi's parents would hide the fact he has a sister from him. Sera looks to be about Shinichi's age, so unless they immediately gave her up for adoption he'd have to know about her, and I doubt Shinichi would simply "forget" he had a sister, or that Ran would have forgotten for that matter. They grew up together and know everything about each-other. Ran would know if Shinichi had a sister.

So unless we're about to find out that Yukiko was/is living some secret second life I'm going to say your theory is quite unlikely. If Sera is someone's sister then it's someone whose family we don't already know much about. Like Akai for example, which is the current accepted answer. However we don't know that for sure, and won't until Gosho outright tells us, and we all know how he likes to throw curveballs. She could be Takagi's sister for all we know.

I meant that she describes them as they would be Shinichi`s Parents not that they are her Parents.

[spn]

I go along with the "Akai's sister" theory, with the primary motive to find her brother (or, alternatively, to find out if he still lives), but I think there has to be more about her than that - there a too much hints in that direction for that. That she called herself a "bad kid" recently could be about doing a mistake, maybe one she did to Akai in the past, I don't know...

[Puto]

My personal opinion on her crying at the end of 814: She wanted to investigate Okiya because she was suspicious he might be Akai, but after actually meeting him, seems to have been convinced otherwise, and as such is sad because she thinks her brother really is dead.

[KuwabaraTheMan]

Well, she's definitely Akai's sister. Her actions to me suggest that she isn't just a regular high school student. I think it's tough to draw too many conclusions beyond that at this point.

[Giogio]

But from her reactions when she saw Okiya, I'm pretty sure she recognized him.

Which makes me wonder even more why she's still so interested in Conan.

[AICHAN]

But from her reactions when she saw Okiya, I'm pretty sure she recognized him.

Which makes me wonder even more why she's still so interested in Conan.

I don't think she recognized him,I think she only suspects him,so she still needs to investigate on Conan,since Conan is an easy prey...

[DetectiveBoysNewestMember]

I thought that she might be a childhood friend who is related to Akai