Okay so while I am starting a medieval fantasy site, it's probably not going to be open until next year; I'm willing to offer you the discord for that, but I figure I'd pitch the site that's established and won't be going away any time soon.
Ramora Weyr is advertised as a real life site, but we've recently started accepting animanga FCs with the rules being that if your FC has natural hair/eye colors, or you're willing to edit them for that, and the appearance is otherwise not too outlandish for a human-only low-tech setting, you can use an animanga FC. Because we only recently started accepting animanga FCs, we have a lot open.
You can find our taken FCs here; we only have a few reserved Genshin FCs, one mzdz FC taken, and none of your other series have any taken.
Ramora is a dragon riders of Pern RPG that requires no fandom knowledge to play in. Pern is a blend between science fiction and medieval fantasy-- while it is scifi space shenanigans, we actually don't do any space travel in our setting and we're very grounded on the planet that was originally colonized (heck, no one ICly knows that humans aren't native to Pern, nor do they know about the history of humanity before the colony was settled). So it plays a lot more like a low fantasy medieval site than a scifi site, with the only remnants of the scifi setting being some slightly more advanced medical techniques and the dragons themselves. There's no magic, but there are psychic dragons in our setting and you can collect them for free serotonin.
The big draw of Pern, of course, is making characters so the admin can match them with custom dragons. We take it to an extreme on Ramora, and we allow a fair amount of member input. We like to make dragons that you as a player would like to play, and if something doesn't work for you, you can tell us at any time.
We are a bigger community (about 35-ish people), but if you ask for threads or connections you will be able to find them. I like to believe we're welcoming, at least. We're also not a very demanding community, so if you come and go, that's also fine by our standards. We're also not judgmental about short posts. We're more than willing to help you get acquainted with the lore, and we'll even direct you to character connections if you're looking for those early on (people might go a little feral, though, you have been warned.)
Here's our site if you wanna check us out.(If you like canons, we also allow "adaptations" and "inspired by" characters. We have a Raistlin inspired dragon and a Cole Cassidy expy iirc, as well as a few others lying around that I might not remember. So long as your character fits the setting, we don't mind.)