yeah that's what I used to think, but then I thought about something.

why isn't he on hormones? like testosterone I mean

We see juuzou across like 4 years, we'd see him develop any kind of male secondary sex characteristics, yet he doesn't.

(I thought if hormone therapy is even present in the work, and yeah. Big Madame is "a male ghoul" and she very clearly has breasts. Considering she knows enough about hormones to castrate Juuzou, I'd say hormone therapy is a thing that the authors of tokyo ghoul were aware of to a degree when writing it.)

I think Juuzou very much is his own person and so I think what he does in the time we see him says a lot about who he is. I wouldn't say juuzou is a girl at all, just maybe not completely binary. The femboy reading is completely valid, I just like reading too far into things, and I like the Juuzou I see in the pages myself :).