Oooo, You'll be surprised.
Depending on the day and the certain time, you'll see a lot of the WC roleplayers.
Now , I don't really know much about WC, only heard about them mostly through the series and such, but yeah. . . . They're still around, just have to find the right time to catch them, plus, they might be off roaming in their own maps and such. ~
Now that you mention it, I haven't seen many around either. Only maybe a couple here and there near stone bridge and wondering Bonfire. A lot of them, like you said, are super 'edgy' and dark. Nothing against that though.
But adding on to what Hakumi said, it could just be a coincidence that when you go online, many of them or offline. It's the same with TLK roleplayers. Also, a lot of them tend to be really far out in Flourite, so it may be difficult to spot them.
However, a majority of them probably do have their own map, just like a lot of other RP groups nowadays.