That is one of those "It depends" responses, haha. There's a bunch of cross-over, and some alternate versions of characters in other character's worlds - Like "the professor" in Cobalt's world - who is just Maniko in a Labcoat - but generally, they're all seperate and don't uuuusually don't get too much lore aside from a base character idea and the stories I write and commission for them. :)