I don't like how you get to know characters only to have them die right after. It'd be better if you got to know them gradually and then have them die in later chapters.
Now, if you see flashbacks of a character you instantly know that they're gonna die....
I am really bad at remembering names, but somehow I remember that psycho girl is Mitsuko, she really made an impression. Such a badass. And her line: "just because I don't care doesn't mean I don't understand" was cool. Totally simping for her