It's pretty good but definitely mature content warning (which you probably already know)

JJK is one that I haven't seen but the WF devs reference it constantly so it's probably at least decent

Heh, yeah. The last high school based anime i really liked was Code Geass (and even then the school didn't appear in every episode)

Love these! The hammer skin would be an awesome addition (we have under-represented weapon classes and hammers are one of them)