Here on pillowfort, user introduces the AO3 Savior script (and config script) with the line:
I have " */*eader " in my blacklists which means it doesn't matter which fandom I'm in or if I'm browsing a trope, I don't see character/Reader or character/reader basically ever.Holy shit, I must get this for my own. I haven't browsed AO3 in forever because */reader has been pissing me off so hard, but now I have a way to block them out! OMFG, that is the best thing. AO3 will finally be functional again without having to browse through five billion shitty fic.