Responses
Don't think it's her since she went to CCG especially to ask questions about how investigators live and work...
There are actually speculations that she's a ghoul, or maybe a half ghoul..who knows?
Does anyone here think Sen Takatsuki works for CCG?
She probably goes by another name. This person here was introduced as "Hogi Ayumu" First Class, but their face is hidden.: http://www.mangago.me/read-manga/tokyo_ghoul/tr/268735/Vol13_Ch129/pg-5/ (bottom right)
Then again here, the face is turned from the readers but the hairstyle is similar: http://www.mangago.me/read-manga/tokyo_ghoul/tr/268747/Vol13_Ch131/pg-7/
Yet once again, the face is never revealed. Any thoughts?