Bluesky for comics, from what I've seen over the past month;
The furries colonized it first and their art, mostly lewds, dominates.
Webcomics looks like the same very small crowd you always see promoting here and on Pillowfort/CoHost/Mastodon. Same goes for the artists who label their stuff as "manga" but that topic is mostly for fans discussing their favorite shows. Comics itself is a bunch of old direct market guys talking about the latest stupid shit Marvel has pulled.
I'd say it's wide open as a platform, but right now most of BSky's user base seem to be there solely because they, justifiably, hate Elon Musk. You can tell that they'll return to Xitter the second he's gone.
I have 4 invite codes at the moment. I think I have my DMs open to everyone so first come first serve? The only way to take over is to outnumber.
Neil Gaiman is active on there. What else do you need?