If you have a dream about Demon girl or Demon child and are worried about what it might mean, this dream interpretation should help put the mind at ease.
If your life has been rolling along just fine without a hitch then you shouldn't have to worry too much about the dream. The demon aspects of it probably related to your personal demons. Everyone has a personal demon or two. These were just the physical or psychological manifestation of those things. Demons in this sense are not actually creatures, just things that you see as a threat to you, things that you need to escape but you can't. To see a demon girl, a demon child etc just means that you are trying to escape all of your inaccuracies and all of the faults that you see in yourself.