It really bothers me these days how everybody wants to label something as a mental disorder instead of just being able to accept that some people are simple eccentric or outright weird.Misha: The girl with the drills, even though seemingly there as a translator shows several signs of mental disorders than on there own seem innocent enough however together seem rather frighteningly accurate to aspergers or some other autism disorder similar.
As far as Nurse flirting with Emi's mom, that just seems to be his character period. I think he flirts with pretty much every character he interacts with, including and ESPECIALLY Hisao. he also seems to have enough handle on people that he knows when to back off, and Emi isn't well know for keeping her opinions to herself. Her traumas? Yes, but she'll let somebody know when something is bothering her.
As far as Hanako goes, we know she was bullied, we just don't know how bad. There are something that people can bullying that others would c all attempted murder or assault.... or maybe it wasn't anything that bad. Honestly, Hanako is a very easy target that doesn't fight back, and has nobody in her corner backing her. You wouldn't even have to mget physical with her to get her to breakdown in tears.
One thing that sticks in my head though, is that gym class must have been a horror for her, with having to change in the locker rooms and wearing those skimpy outfits.