It looks like this world is in Reality and not Unreality (people theorize the heartless in Quadradum are different due to just being how they look in the Unreality side, and the Coco heartless are clearly the normal ones we're used to), which could answer one question I had: Unreality is so different that the normal type of worlds wouldn't make sense, so I would just be expecting stuff like Square worlds and Star Wars and Marvel in Unreality. How does Sora get back to Reality? There must be a catch of course. Iirc in TWEWY, underground residents couldn't interact with the living world, and neither can Land of the Dead ones. Maybe Sora can be in Reality for short times but can't interact with people there, and the Land of Dead Coco characters are an exception?