Pretty sure there are two different Flandres here.
Flan1 has glasses and a mask, appears to have a slight difference in outfit (Guyflan)
Flan2 no glasses mask or white bit lower on outfit (doesntlooklikeaguytomeflan)
Though we're probably going to get rockman come and tell me otherwise. :V
Well, since we are not in the same teams, just Aya (He is a guy) found out that there were too many Touhou cosers, so after lunch, Aya met Meiling (The red one, a girl, not the black one, a guy), then several minutes later, they found over 20 cosers.
Here is a list, but not all members because we failed to call some others.
Scarlet mansion team:
Four Meilings (Two dressed in Red are girls, and one dressed in Red is a guy and the black one is also a guy).
Three Remilias (One of them is Koumajou version, all of them are girls)
A Flandre (The guy with mask but failed to find the girl who has wings).
Two Patchouli. (Girls)
A Sakuya (Failed to find three normal version but only a Koumajou version.)
Eientei Team
Eirin (A guy without bow and hat).
Reisen (A girl)
Tewi (A girl)
No Kaguya and Fujiwara.
Perfect Cherry Blossom Team
A Yukari (Girl, but really short)
A Ran (Guy, but a bit tall)
A Youmu (She is an exhibitor just passed here and called by us.)
A Youki (Me)
Two Yuyukos (A normal version and a Koumajou version)
Other characters:
Aya (a guy)
Momiji (A girl)
Yoshika Miyako (A guy who is a friend of one of two Rinnosukes)
Two Rinnosukes.
A Cirno (Girl)
Well, we failed to find another three normal version Sakuyas and the fattest Yuyuko and Tenshi. Wriggle and Murasa can't wait anymore and left us. It was said that someone found Rumia in somewhere, but I am not sure. No Daiyosei as well.
Then I gave them my name card and the girl who dressed as Meiling added me last night.
Edit: There is a joke between us.
Why Scarlet Devil Mansion is rich?
Because Meiling runs a Chinese food restaurant while Sakuya runs a maid cafe then Patchouli runs a library. So they can easily earn money.
Koumajou Reimu ended up sell her images to get a little money, 10 yuan (About 1.5 dollars) each. The normal Reimu is also an exhibitor. So I said that there were about 40 Touhou cosers, only a little of them are exhibitors while most of the them were just like me, a cosplayer for entertainment.
Next time when you want to visit Shanghai, if there is another exhibition, I will bring you there as well. Of course, I will be a coser.