With the other people we are assuming that our musses just wake up on the other's world. If you have any doubt just ask me :D I'm always happy to help. Worldhoppers can be many things. Elphaba use her flying broom, Tatsumi his powers to control shadows, but not everyone has whorlhoppers. for example, in canon Tatsumi can travel between world, so he can worldhop by itself, but I asked mod permission to knowe if Elphaba's broom could work that way.

Your world soudns good <3