Without a shadow, it would appear that the shadow may be this person's true form.
The change in this person's appearance and the text when Granny Tang became a Shadow Ghost in the game previously, it first let the outer form become the shape of a shadow, then the notification to become a Shadow Ghost appeared.
This transformation reminded Mu You of 'skin'.
Players enter into the Star Spirit World by projecting a virtual Mind Avatar. If the Mind Avatar can find a local's body in the Star Spirit World, whether dead or recently killed, they can 'wear' it as a skin, and thus exist in place of that native.
Since players can enter the Star Spirit World in the form of a game character, could it be possible for the Star Spirit World inhabitants to similarly invade Earth?