Board Thread:General Discussion/@comment-24563708-20140218194720/@comment-3146930-20140218225739

Souls in the series act differently from how most people think a soul would act; people in general think that souls would act like ghosts. However in the series, most souls are just as physical as regular human bodies. Those that escape from the Underworld actually seem to come back to life, as if they had regained their humans bodies or just escaping the Underworld caused their bodies to return.