Supposedly common fanfic things you've never encountered

Part of the reason I love this subreddit is that it shows me how vast the fanfiction world really is. Some of the tropes/genres/writing quirks that people bemoan as "inescapable" are things I've literally never seen in the wild, including:

• OP protagonists

• harems

• strict love > marriage > babies progression

• clinical overemphasis on consent/safe sex

• epithet abuse (okay, I see this sometimes, but it's rare)

I'll admit that I'm not reading a ton these days. I mostly stick to my handful of favorite authors and whatever my friends are recommending, and that definitely does a lot of the filtering for me. It's still funny, though.

What "common" tropes make you feel like you exist in another universe?