I wonder if Hinata is going to become an actor? It seems like she would be very good at method acting, if she is able to completely transform her presence to match a particular character. Though I am not sure that stunting her own growth as a person from a young age is a valid price to pay for that.
Also, Tsukiko may find her calling as a cosplay medic. As far as I understood she was able to fix Hinata's costume because she always goes to the conventions with the full costume of the same character in her bag, but if she doesn't ever plan on actually wearing it again, there is a missed opportunity for doing a lot of good there.
"I'm 14 and in 2nd year of middle school!"... I knew beat-for-beat that this would happen and how, but still somehow was surprised. Also amused, very amused. And looking at the author's other works was an "oh... that..." moment of its own. I do not know what to expect, but I say fuck it - go big or go home. Either case, I will most probably be amused.