We have no clue are they all a same character or not but I agree the fact that they face are literally the same! XD
Yeah, Nene's uni friend, they didn't really give any name in manga...... Seriously, what's up with the glasses on the side characters? Aside from Hazuki and Wako though.
About the Nurse/Cameragirl/Policewoman, she has too many part time jobs. I'm thinking that we'll see her again in some future chapter, in another job.