Rec the Thing: Tiny Fandoms Challenge

[froodle]

Our last week of prompts! Thanks to everyone who's been posting recs. :) These prompts are for September 22-28. After that, I'm going to declare the last two days of September and the first week of October as an amnesty period, when you can post any recs you didn't get around to before. :)

WEEK FOUR THEMES
- Works over 50k
- Underrated works (by whatever metric)
- Works about tiny fandoms (define this however you like!)