The one that jumped out was Magical Girl Raising Project, which a younger me might have described as dark and edgy, but me today would call misery porn (it's not actually porn, just to be clear).

Now that I browse again, most are really good, but some are just a bit dull while being great examples of being from a certain place. Not to call it out in particular, but I ended up dropping Robotics;Notes for being kinda dull, despite it being part of the 5bp semicolon extended universe (Steins;Gate et al).