AO3's tag system makes finding specific Caseoh and reader stories pretty straightforward, but the quality swings wildly. I'll sort by kudos and end up reading five in a row where Caseoh acts totally out of character, just a generic grumpy guy template. Then you stumble on one where the writer nails his particular blend of deadpan humor and subtle care, and it's so worth the digging. Sometimes I wish there was a way to filter by 'actually understands the source vibe'.
Tumblr's a different beast entirely. The shorter, moodier pieces there often capture his energy better than some of the epic-length AO3 attempts. Found this one textfic-style series that was just screenshots of imagined texts between Caseoh and the reader, and the comedic timing was perfect. It feels more immediate, less polished, which works for his chaotic streaming persona. The downside is organization—good luck finding that gem again six months later without meticulously reblogging it.
Honestly, I've had better luck in small Discord servers dedicated to his content. Someone will drop a Google Doc link, and because it's a tighter community, the feedback loop helps writers stay closer to character. The stories feel like they're made by people who actually watch the streams, not just someone plugging a popular name into a premade fanfic scenario.