I already write quite a bit about the stuff I share from my Ask game, but if I had to choose something in this moment;

Probably Coroika. There's not much lore but I've had moments where I cooked up some headcanons, maybe had some ideas revolving the characters. I also have one OC but that's it. The other part about Coroika is I don't mind discussing the flaws or just the cons in general of the manga. Ships tho? Hmm, well I already don't ship a lot, and the few ones I do aren't as popular whatsoever. I literally have a rarepair as my otp...