First and foremost: Wakfu. For a long time (2012) it was the one show that I've seen and could never discuss IRL or outside /co/. Even sometimes when I saw people playing Krosmaster I couldn't discuss the show with them because they haven't seen it. I've yet to see somewhat worthy discussion of it on social media outside of /co/ but I at least got vindication one time with my girlfriend's former roommate who watched it.
The Legend of Korra (and Avatar the Last Airbender). /co/ was basically /Korra/ when it was in its prime shitposting state so I had to see it.
Scooby Doo Mystery Incorporated
Miraculous Lady Bug
Kill Six Billion Demons
Thor: God of Thunder.
Kelly from the Onion
and I bought Spectacular Spider-man 101 solely because I saw the cover on /co/ one time and I remembered it when I walked into a comic shop.
Oh wait, I misunderstood your question. I thought you meant things /co/ convinced you to try.
Well, I guess /co/ media made me want to try Jawbreakers and Potatoes and Molasses from EEnE and OTGW. Neither of which were good.
Scooby-Doo did make me try multi-layered sandwiches though.